15 Best Electric Tankless Water Heater Reviews – Editors Pick

It is not hard to understand today the need for a water heater without tanks. However, when you’re going to select one for your home, it seems like a nerve-wracking task to find the right one from the aisles. To make you worry-free, we have prepared an electric tankless water heater reviews on the top 15 items, believes that it will get you in a comfortable position from where you can choose the best machine for your family or business place.

There are two major types of tankless water heaters on the market – gas or propane powered and electrical. Why do you choose the electric heater between the two of them? Let me examine the following points to get the answer.

There are two major types of tankless water heaters on the market – gas or propane powered and electrical. Why do you choose the electric heater between the two of them?

Related: The Best Faucet Water Filter Guide and Review 2020

11 Best Electric Tankless Water Heater at a Glance 

Last update on 2021-09-27 / Affiliate links / Images from Amazon Product Advertising API

Let me examine the following points to get the answer.

• Installation is often cheaper than gas, as no exhaust or ventilation system is needed.
• You no need to apply for a specific gas line or to purchase a propane cylinder at regular intervals.
• It can be installed indoor or outdoor of the house, under cabinets, or in a cupboard.
• Its digital interface allows you to set the desired temperature precisely.
• Sometimes it comes with remote control operation.
• It’s more energy-efficient than gas, up to 99 percent energy-efficient.
• It does not produce greenhouse gases, thus, environmentally friendly.
• Use less energy because gas-fired tankless water heaters usually have a continuously burning pilot light.
• Use less energy because there is no “standby” heat loss; hot water is on-demand.

However, there is also a drawback to every invention, and the electric water heater is no exception. We found it’s a little less effective in colder weather than the gas heater. In other respects, however, it is a step forward that triggers the sales growth day-to-day.

So, what else are you waiting for?

Let’s check out our reviews of the best electric tankless water heater below.

1. Eemax EEM24018 Electric Tankless Water Heater

Eemax – the #1 supplier of tankless electric water heater solutions in the USA brought to you the most advanced devices that open up the option to choose your model according to your climate, which means no more numbing sensation of cold water and no more energy wastage. Once you install Eemax 18KW tankless water heater, you will get instant, consistent, and endless hot water supply at your faucet.

Eemax EEM24018 Electric Tankless Water Heater can be run at a minimum of 25 psi pressure and a maximum 150 psi. It requires 240 Volts of energy to achieve an output of 18 KW units in the form of heated water. The compact design and weight of 11.25 pounds make Eemax EEM24018 mountable anywhere in your house. It includes solid, hand-welded NPT exchanger adapters that make it easy to install.

Last update on 2021-09-28 / Affiliate links / Images from Amazon Product Advertising API

Features

Advanced Energy Saving Technology:

The Eemax heater comes with the most advanced self-modulating water heating technology, which automatically adjusts the amount of energy employ based on the hot water demand. Therefore, it helps you to save energy costs without interrupting hot water flow.

The digital temperature control panel in front of the unit allows you to set the desired temperature precisely with 1°F increments, and you can set output temperature ranging from 80°F to 140°F. You will get 99.8% energy efficiency from this unit.

Sleek and Compact Design:

The shiny blue color Eemax tankless water heater looks gorgeous that eliminates the need to cover up it and enhance your home beauty. Not only it looks beautiful, also its compact size 17-inch height and 14-inch width make it suitable to install in any place under your cabinet or inside the closet. 

Sturdy Built:

In addition to its compact design, Eemax uses Stainless Steel to improve the strength of its body, and Copper Emerson heater components with a brass top make it threaded for quick replacement as well as increase durability.

Easy to Install:

Where most of the tankless water heaters on the market tell you to take expert advice from the recommended plumber, Eemax gives you the freedom to choose whether to do-it-yourself or to takings assistance from general technicians in your vicinity. Yah, sure! The Eemax’s box contains an installation manual, which illustrates the process so well that the assembling of the heater is like a breeze.

Precise Choice For Commercial And Residential Uses:

The 240volt and 18KW Eemax EEM24018 Electric Tankless Water Heater blue is an ideal device both for residential and commercial use as it provides enough heat to cover up to one shower and a couple sinks simultaneously in cold weathers and up to four showers or sinks in warmer climates. You will also get a maximum 7 GPM hot water flow 60psi. All the high-end features make this device is one of the best tankless electric water heaters in its class.  

Five Years Long Warranty:

For your trust, Eemax provides a five-year warranty on infrequent leak repair. Whenever your product starts to show any leakage, you’ll get it fixed. Moreover, you will get a full one-year warranty for parts.

Pros

• Self-modulating technology
• Adjustable temperature control
• Compact size and beautiful design
• Easy to use and installation
• Highly energy-efficient
• Cost & environment saving

Cons

• Hot water outflow reduced in cold weather
• Show less sensitivity to flow rate and hot water temperature adjustment

What Type Of Electric Connection Required To Run It?

It needs two double-pole/phase 40A breaker connected by 2×8 gauge wire to run smoothly.

What Is The Inlet And Outlet Size?

Both the hot outlet and cold inlet size is ¾-inch. 

What Is The Maximum Flow Rate?

The maximum water flow rate is 7 GPM  60psi and turn on 0.3 GPM.

2. Eemax EEM24027 Electric Tankless Water Heater

If you are a member of a large family or want to run more fixtures and require extra GPM, you can use the Eemax 240volt 27KW 5.3 GPM tankless heater water heater instead of the 18KW version.

With the EEM24027 heater you can run two water-saving shower heads (1.5 GPM each) when the inlet water temperature is 42°F, and you could run four water-saving shower heads (1.5 GPM each) and a hand-washing sink (0.5 GPM) simultaneously when the inlet water temperature is 77°F, which is undoubtedly higher than the EEM24018 version.

Nevertheless, apart from the difference in the water flow speed, other features remain the same for both devices, and you will get the identical Eemax value.

Last update on 2021-09-30 / Affiliate links / Images from Amazon Product Advertising API

Features

Smart Energy Efficient Digital Technology:

Sensitivity against heat varies from person to person, children, and aged people are more sensitive to heat, and one-degree ups and downs can change the coziness. Eemax knows that well and designs its every model, including EEM24027 smartly. With a digital temperature controller, you can adjust your desired temperature ranging from 80°F to 140°F with a one-degree increment.

The heater use energy based on hot water requirement that means when you open the faucet for hot water, it started heating, and when you stop the valve, the device stops heating up. Thus it can save a significant amount of energy every time and saves electricity bills.

Sleek and Compact Design:

Like the EE24018 version, it also comes with a beautiful blue color that improves the elegance of your kitchen or bathroom, and a 17-by-17-inch size with a weight of 13.75 pounds makes it easy to install. You can even set up this compact heater under a cupboard or something like if you don’t like its fancy color. 

The compact size also allows you to set it in different positions, such as under a kitchen cabinet, a bathroom closet, and a basement. It will not be wise, however, to put it outdoors as cold weather could impede efficiency.

Sturdy Built:

The body of EE24027 hot water heater made of stainless steel as like its 18kw series and heating parts are threaded and made of Copper Emerson, which ensures durability as well as easy to replace any parts.

Easy to Install:

It’s too easy to install that you need an electrician who can connect it with three 40 Amps breakers through 3×8 AWG wire as it requires three-phase lines to function. The rest is plain, installed the box with four wall screws, and attached with the inlet and outlet pipes. There’s no need for an exclusive gas line or spending a ton on a highly skilled plumber to get hot water supply at your faucet.

Compatible for Commercial And Residential Uses:

Total water flows 7 GPM 60psi, and 27000-watt power makes Eemax EEM24027 ideal for both commercial and residential use. You can run four showers and a sink at the same time when the weather is dry. It can also be used for a wide range of applications where continuous hot water supply is required, such as kitchen faucet or dishwasher, bathroom shower, or basement for use in a washing machine.

Five Years Long Warranty:

And finally, the Eemax tankless water heater comes with five years warranty on leakage and one-year free service for parts to back up you.

Pros

• Smart technology
• Digital temperature display
• Durable and easily replaceable parts
• Easy to use and energy efficient
• Copper tubes prevent calcium buildup
• Endless hot water

Cons

• 2 GPM flow 42°F inlet temperature is really insufficient
• It is good that it offers a five-year warranty for leakage, but one year warranty for parts is not enough

Is that enough for two bathrooms and one kitchen apartment?

It depends on how many people use this unit simultaneously as it can deliver hot water to two water-saving shower heads (3.2 GPM) at a time when the inlet water temperature is 42°F

Do I really need the Aerator to be installed?

By using an aerator in your faucet, you can control the flow without hampering your cleaning job, which leads conservation of heater energy. It is also recommended by California 65.  

How often do you need to wash and flush the unit?

Eemax recommended to flush the unit once in a year. While doing so, you can use the Eccotemp EZ-Flush System Descaler Kit with Solution, which is Non-Corrosive, Non-Toxic, and Biodegradable.

3. Hyperikon Tankless Water Heater Electric

Are you looking for a powerful and efficient water heater for your home? Hyperikon Tankless Water Heater Electric comes with 37,543 BTU heating power that can provide instant hot water that you never run out of hot water.

You can also save your money by using this heater because it only requires 240 volts of energy to produce 11 KW of heated water, and it uses electricity only when you use hot water – no standby or pre-heating. It is so efficient that it can produce hot water at 0–87 psi and 0.53 GPM of water flow. Besides, it enables you to set your desired temperature from the range of 86°F to 126°F with its touch panel smartly and efficiently.

So, what else are you waiting for? Oh! Want to know more, then scroll down with us or check the price here.

Features

On-Demand Hot Water:

No more waiting for hot water once you install nice looking smart technology Hyperikon tankless water heater. It comes with a heat capacity of 37,543 BTU, which capable of transferring heat to stream instantly. Based on your comfort and requirements, you can set your desired temperature between 86°F and 126°F with the touch-enabled control panel.  

Superior Temperature Control:

The touch panel of this system is operated by a micro-computer that enables you to set and monitor temperatures ranging from 86 ° to 126 ° F. It shows the inlet and outlet temperature and other error messages on the LED screen with its integrated temperature sensor. You can convert the degree to Fahrenheit or Celsius, depending on your requirements.

Easy-to-Install:

One of the main concerning point regarding the induction of an electric water heater is its power supply. To connect the Hyperikon heater, you only need a single-circuit dual pole 50Amp breaker and 240volt, 45.83A line that is easy to manage and does not require a lot of drudgeries to do rest of the works like hanging the device on the wall, connects inlet and outlet pipes and so. If you are a DIYer homeowner, you can configure it by yourself quite easily. However, take necessary precautions every stage.

Cost and Energy Saver:

The 11kw tankless water heater from Hyperikon will draw only the amount of electricity needed to produce the hot water. It provides hot water instantly, and for that reason, no pre-heating is necessary. As there is no preheating, so there is no excess water is heated – the result of which you could save money and energy.

Space Saving:

The outer dimension of this Hyperikon device is 15.1×10.2×3.7 inch and weight, which is a compact and space-saving design that allows you to install it in your bathroom or kitchen openly or under the cupboard.

Leakage and Overheat Protection:

It features an integrated temperature sensor and is fully secured from leakage and overheat, with temperatures up to 153 ° F (67 ° C). Therefore, without hesitation, you can set your desired temperature.

Warranty:

Hyperikon comes with an unlimited five years extended warranty support to makes you worry-free. You also get exclusive customer support 24 hours seven days for an easy and fast replacement.

Inlet Water Temperature vs. Water Flow:

Inlet Water Temp	37°F – 47°F	47°F – 57°F	57°F – 62°F	62°F – 77°F
Outlet water flow	1.3 GPM	1.6 GPM	1.75 GPM	2.7 GPM
Number of Fixture run	2 Faucet	1 Shower Head	1 Shower Head	2 Faucet and 1 Shower Heat

Pros

• Compatible at 180-250V
• Over-Heat and Leakage Protection
• Micro-Computer Control
• Conversion between Fahrenheit and Celsius Degrees
• Touch panel control with LED screen
• Auto memory that saves the last setting
• ETL listed and NFS approved
• 24/7 customer service

Cons

• Plastic housing may catch fire in case of overheat or short
• Instead of fixing the body with the wall, it comes with a hanger type mount bracket

What is the hot water flow rate?

The flow rate depends on the inlet temperature. However, the standard flow rate is 4 GPM.

Can I use it to heat the floor of size 1200sq feet?

Yes! You can, but it will not be overheated when the temperature rises at 153°F.

How frequently you need to clean it?

If you use descaler inside the cold water inlet pipe, you may require to clean the system once a year or less.

4. Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater

Are you stressed to get hot water at your sink or fixtures right away? Are they situated in a remote location far from or not supported by a tank or a tank-less type water heater, and retrofitting is either too expensive or impractical to do? Only a Point of Use (POU) water heater can save you from this kind of scenario, and when we think about POU – Ecosmart POU 3.5 comes in our mind first as they are near 100 percent energy-efficient, deliver endless hot water whenever we need and save electricity cost remarkably.

Last update on 2021-10-05 / Affiliate links / Images from Amazon Product Advertising API

Features

Simple Design:

The Ecosmart POU 3.5 is a real Point of Use electric tankless water heater that is built for a single application in a hand-sinks with a maximum flow of 0.5 GPM. Its space-saving compact design (dimension – 3 x 11 x 6 inches) is ideal for hand sinks, small shops, wet bars, strip mall, doctors’ clinics, medical offices, sailboats, Recreational Vehicles (RVs), school, restaurants, commercial facilities, hotels, daycare center, bathroom sinks and more.

Ecosmart uses copper and stainless steel components while design POU 3.5 and 6 to ensure greater efficiency, durability, and easy replacement of parts.

Energy Saving:

When you installed the Ecosmart POU 3.5 tankless water heater in your house, you started saving your energy bill as it consumes 40% less than the other traditional water heaters. It can save energy through the use of advanced technologies. It can start heating water at a rate as low as 0.25GPM, and the flow sensor, which controls the energy requirement, is triggered once it’s begun. In the case of the higher flow speed, more energy used, and less power is consumes at a lower flow rate.

Simple Working Principal:

Ecosmart POU 3.5 is modest to operate because of its simple operating system. It has a digital display to monitor the unit’s status and a temperature controller that allows you to set the outgoing water temperature in increments of 1°F, from 80°F to 140°F.

Easy Installation:

To install Ecosmart POU 3.5, you required a minimum 100 amp electrical panel with one 30 Amp single pole breaker and #10 AWG wire. It also needed ½ inch NPT plumbing connections. 3-ft electric cable and 1/2” NPT water connectors included for easy flex hose installation, then you can install it within an hour without taking any help of plumbers, it’s that easy. Moreover, the manufacturer’s instruction supplied with the box, which may help you a lot to DIY.  

Warranty:

POU 3.5 water heater has a one-year limited warranty for residential use on its electronic parts, heat exchanger, and the element. You could avail of this if you registered properly and install within 30 days of purchase.

Pros

• On-demand, consistent and endless hot water
• Digital display to show output temperature
• Compact size suitable for under sink installation
• Save energy and water – 99.8% efficient
• No standby heat loss and no long pipe runs
• Easy installation
• Works with low water pressure
• Solid, hand-welded exchanger

Cons

• Non-thermostatic may increase the risk of scalding
• Not usable where the inlet water temperature is below 57°F

Is it required to turn on or off manually?

No, when it detects the proper flow of water, it will automatically turn on and off if you close the faucet.

Is this unit work where the temperature near freezing?

It will not work temperature lower than 57°F

5. Bosch Electric Tankless Water Heater

The Bosch Group is a prominent global manufacturer of automotive, industrial technology, consumer goods, and construction technology and services offer a wide range of tankless electrical water heaters that take the idea of the tankless heater to a new height.

Bosch tankless water heater means there will no longer any bitter experience of sandwiching in cold water while showering or washing hands. As soon as you turn the valve on, you will get hot water as it always ready to warm for use. With a Bosch tankless water heater 7.2KW, you can be sure of a minimum of 0.5 GPM water at any time.

Last update on 2021-10-02 / Affiliate links / Images from Amazon Product Advertising API

Features

Endless Hot Water Supply:

Bosch point of use water heater features element modulation system to control the water output temperature that eliminates the time for hot water. It also ensures that you get a constant supply of warm water with a stable temperature at your faucet. In addition to the endless amount of hot water, it also has a flow sensor to track the water temperature, which ensures that you are having the temperature precisely what you are setting at the outlet.

Energy Efficiency:

Ultra-compact and lightweight Bosch Tronic 3000 Point-of-Use heater model that allows it to be mounted under the sink right after the faucet. So, there’s nothing between your fixture and water heater as well as there is no standby loss, no continuous cycle of heating and pre-heating, the result of which the energy efficiency triggered up to 98 percent.

High energy efficiency leads to minor energy costs. Moreover, by using Bosch point of use tankless water heater, you can save your monthly electric bill significantly as it uses energy only when you use hot water.

Extremely Compact:

No more worry about where to place the Bosch Tronic 3000 tankless water heater as they are designed to be compact enough to go almost anywhere in your home or office even it is small enough to fit under your bathroom or kitchen sink. You can also mount it horizontally or vertically. You can even install it in an open place by matching with your décor as they aesthetically designed.

Wide Range of Applications:

The Bosch Tronic 3000 series 7.2KW US7 model suitable to connect in 208 to 240 nominal volts, 30Amp circuit breaker connected by 10AWG wire. This flex installation allows you to set the Bosch electrical tankless water heater for a basement wet bar, Laundry bar, patio kitchen station, pool house, utility room, garage, attic, or even an RV or boat, single-unit use in the apartment building and more.

Warranty:

Bosch Thermotechnology Corp. (BTC) offers five years warranty for leaks of heat exchanger and one year for parts from the date of original installation. During this tenure, if it found a hole/leakage due to the manufacturer’s fault, they will replace or repair it immediately.

Pros

• Sleek design and ultra-compact
• Lightweight
• Leak prevention
• Mounts on wall or under the sink in any direction
• 98% thermal efficiency
• Saves energy and money
• Adequate warranty

Cons

• Only operational for one fixture at a time
• Non-thermostatic control

Could I mount it on my own or need a professional plumber?

​Bosch suggested professional installation and hard-lined wiring. If you manage to do it yourself properly then ok, otherwise it’s better to take pro aid to get the warranty support.

How much hot water stream am I going to get from this?

​From Tronic 3000 Series 7.2 KW US7 model, you will get a 1.1 GPM output flow @45°F temperature rise and 0.7 GPM @ 75°F.

Can I use it to boost up the existing hot water supply?

​It is recommended to connect in the cold water line only. So, you cannot join it with the existing hot water line.

6. Marey ECO150 Tankless Water Heater with Smart Technology

Are you looking for a reliable electric water heater that allows you to enjoy endless hot water at higher efficiency and affordable price? Then you’re coming to the right place. The only water heater that embraces German engineering – the Marey ECO150 is ready to serve you here.

The visionary Puerto Rican entrepreneur Mariano Reyes, who spent his whole life making revolutionary tankless water heaters, founded Marey in 1955, and Marey ECO150 is a proud member of that family. It designed to serve hot water at two levels/point-of-use simultaneously, rising the incoming water temperature up to 29 °F at the speed of 3.5 gallons per minute water flow.

Last update on 2021-09-30 / Affiliate links / Images from Amazon Product Advertising API

Features

Smart Operation:

Marey ECO 150 has a bold LCD panel at the lower middle part of the metal body with a capable controller (there are two buttons for up and down, and one for on/off), which allows you to adjust the desired temperature quickly. Its smart technology (built-in temperature sensor and flow regulator) programmed such a way that it automatically optimizes energy consumption based on your water use and temperature setting.

Space-Saving Design:

The white color sleek design Marey electric tankless water heater comes in a super-compact body size 14.2-inch long by 8.7-inch height by 3.5-inch width. You can hang the 10.1 pounds water heater anywhere under the kitchen sink or bathroom closet vertically without occupied your valuable space.

Endless Hot Water On Demand:

The Marey point of use tankless water heaters equipped with a Flow switch activation mechanism, which allows the device to produce constant temperatures with as little as 0.5GPM and minimum 5 PSI pressure. So, whenever you open the tap, you will get a hot water supply up to fulfill your requirements.

Resistance Against Corrosion:

The heating element of the ECO150 made of Nichrome with a stainless steel water channel that is unique in its class. Both these components have high resistance and prevent hard water build-up from corrosion caused due to calcium and chlorine. So, no need to tense much about descaling or regular maintenance.

Easy Installation:

The Marey ECO150 water heater 14.6 KW requires a 220 to 240V electrical line and a 70 Amp Double Pole circuit breaker connected by 6AWG cable, which is not so difficult to manage by an electrician. However, for security and maintain state codes as well as long-lasting performance, it is highly recommended to install all Marey tankless water heater by a licensed plumber or electrician.

Over Temperature Protection:

When the output water temperature rises to 140°F/67°C, the electric connection will automatically shut down to avoid scalding and the monitor of the control panel show E1. Again when the temperature falls, the system automatically starts working. 

Malfunction Sensor:

This water heating equipment has a built-in malfunction sensor that alerts and shows E3 in case of any unusual thing happen, and the heater stopped working. 

WarrantyAnd Customer Support:

It comes with five years warranty for peace of your mind and protects from any defect or malfunction arises due to manufacturing fault. Besides, the warranty support, you will also get exclusive customer care service.

Pros

• Endless hot water up to two points simultaneously
• Space-saving unit with beautiful white metal alloy casing
• Adopting patented heating technology
• Excellent corrosion resistance
• No preheating, No Standby energy loss
• Microcomputer control
• Multiplayer composite nano insulation to separate electricity from water
• Conversion between Celsius and Fahrenheit
• Easy to fit and provides steady hot water
• The excellent customer service team

Cons

• Suitable for one person use only
• Found leakage problem occasionally

What size copper pipe required to connect with this device?

The recommended pipe size is 1/2 inch NPT.

How much water flow required to activate this unit? 

​The minimum water flow required to activate this heater is 0.53 gallons or 2 liters per minute, and the safe operating pressure is 5 to 85 psi.

What is the relation between temperature rise and water flow?

​Please see the below chart to find your answer-

Temp. Increase	GPM
98°F	1.0
68°F	1.5
51°F	2.0
41°F	2.5
34°F	3.0
29°F	3.5

7. Titan SCR2 N-120 Electric Tankless Water Heater

We reached mid of our reviews, and now we are going to introduce another powerful brand in the tankless arena the Titan SCR2 brought to you by the leading tankless water heater manufacturer of Miami’s Niagara Industries. Titan SCR2 N-120 electric tankless water heater design by supporting space-age technology, which makes it more accurate and faster in temperature sampling. It also comes with a manual resettable thermostat and new air/water deferential analyzing system to prevent dry starts, which very unique that you will not found in other tankless on the market.

Features

Energy Saving:

Titan SCR2 heat water only when it is needed. Therefore, you can save over 60% energy cost over traditional water heater by using it.

Highly Efficient:

This tankless water heater designed by Titan SCR2 has a dedicated analog microprocessor that sampling input and output temperature 21 times per second. Its power control system not only analyzes data but also manages power usage, which makes it a highly efficient device compared to others.

Corrosion Resistant Body:

The water-carrying parts of the Titan SCR 2 T-120 model made of dual Incoloy Nichrome, which prevents the deposition of any mineral and therefore extends the life expectancy. The body also made with copper and brass for robust design.

Compact and Easy to install:

10 by 7 by 3-inch size and 8 pounds weight make Titan SCR 2 tankless hot water heater easy to fit model in any corner like under the kitchen sink or bathroom or basement for convenient use.

To install this device, you need 220-240volts electric line and connected through a double-pole 60A circuit breaker, which is not tough to manage by a nearby electrician.

Suitable For Use In Multiple Room:

You can use this Titan SCR 2 water heater to get hot water in 1 to 3 bathrooms at a time. It is not only suitable for use in household purposes, but also you can use it for condominiums, beauty salons, hospitals, boats, campers offices, laboratories, schools, cottage, barbershops, restaurants, and many more.

Warranty:

Niagara Industries offers 10 years of exclusive warranties for all water-carrying components of the Titan SCR 2 N-120 model and a year warranty for parts, which is up to the highest in our listed products.      

Pros

• Durable and compact design
• Energy-efficient – up to 99.5%
• Shielded Incoloy heating element – great for hard water
• No dry starts – new air/water differential analyzer
• Superior temperature control with resettable thermostat
• Low activation flow 0.4GPM-on and 0.3GMP-off
• On/Off indicator light
• 10-year warranty for water components

Cons

• It is suitable for use in a cold climate only where incoming water temp lower than 65°F
• It requires to reset the system several at times

What is the minimum water flow required to start it?

The minimum water flow required to start it is 0.4 GPM. However, if it is lower at 0.3 GPM, automatically stop the device.

 Is it comes with a digital Interface for temperature control?

I’m afraid. It might not come with a digital display, you can control the temperature with two-button, and it indicates the heat low to high with red and green lights. 

For how many baths I can use this device? 

As per the recommendation of Titan, you can use this unit for a 1-3 bathrooms apartment.

8. Kbxstart 3000W Mini Instant Electric Water Heater

Are you looking for the best electric tankless water heater for RV? You may try this super mini Kbxstart 3000W instant heater. Yes! It can give you ultra-hot water within 3 seconds that saving your time. Its size is much like an apple 6 plus phone, which makes it suitable for use in the kitchen sink and bathroom faucet conveniently. 

Last update on 2021-09-30 / Affiliate links / Images from Amazon Product Advertising API

Features

Mini Body Design:

What is the most exciting thing about this Kbxstart 3000W is its mini stature approx. 13.5 x 6 x 16.5cm/5.31 x 2.36 x 6.59 inches dimension and 2.8 pounds weight makes it convenient to set inline of your cold water supply and get instant hot water.

3 Seconds Please:

Just turn on the faucet knob and get instant hot water at your hand. Yes! It is so fast that it can turn cold water to warm within three seconds.

Simple Operation:

You can freely adjust the water temperature by the digital temperature display of the liquid crystal shows and thus the water flow, it is that simple.

Super Easy to Install:

It needs 25A to 30A current to run, and therefore, you can connect it with a 10AWG wire and 30A circuit breaker 110v / 120volt line under your sink of kitchen or bathroom. It supported the standard 1/2 interface, which can be directly connected to the household conventional hose connector/faucet metal hose/kitchen faucet hose.

However, this mini water heater is not suitable for use for showers as it designed for low water flow uses.

Superior Safety Features:

Kbxstart 3000W Mini Instant Electric Water Heater comes with some excellent safety features that necessary to protect you and your houses like – Anti-leakage protection device, IPX4 anti-splash protection, anti-dry protection, hydroelectric isolation protection, house insulation protection, and other security measures.

Other Features:

The starting pressure of this mini tankless water heater is 0.4 to 0.6 MPa, and the rated pressure 0MPa, the rated power is 3000 watt, waterproof rate IPX4, rated voltage 110V, and frequency 50Hz. It needed a US plug to connect. You will get 33-55 degrees Celsius water temperature with this Kbxstart 3000W heater.

It also supports Waterless automatic shutdown, automatic shutdown at overheat to protect your house as well as scalding your skin

Pros

• Ultra-mini stature in beautiful color
• No more wait for hot water 3 seconds starts
• The built-in leakage protection device
• Auto shut-off in case of any error for safety
• Suitable for use in RV

Cons

• Heat for just a few seconds that cannot heat the whole sink
• Not suitable for outdoor use as water pressure does not meet the product requirements.

 Is it suitable to use in a shower or bathtub?

​Nope! It can only supply hot water for sink bathroom faucet. Also, the temperature rises to 35°C to 50°C is not enough for a shower.  

Is it wall mounted or hang on type?

​You can fix it with your wall by screw.

 Is it suitable for outdoor use?

​ You can set it outdoor, but you will not get enough pressure to turn on the heater when you connect it in dinning motor, campers or motorhomes.

9. Rheem RTEX-13

Rheem is one of the most trusted names in cooling and water heating technology and the largest company of water heating products in North America, founded in 1925 in Emeryville, CA, with the hand of Brother Richard and Donald Rheem.

From the very beginning of its journey, they’re serious about quality, and we found no exception in the case of the Rheem RTEX-13 household tankless water heater too. This professional look classic tankless water heater designed to serve you endless hot water quickly and on-demand for single point-of-use or multiple applications. From this 13KW model you will get up to 4.8 gallons per minute water flow, which is ideal for use in the shower, multiple sinks, dishwasher, or washing machine.

Last update on 2021-10-04 / Affiliate links / Images from Amazon Product Advertising API

Features

Provide Hot water to multiple fixtures:

Continuous and on-demand hot water with 4.8 gallons per minute flow rate is an excellent feature for any water heater, and you will get all this in your Rheem tankless electric water heater. Though compared to other big capacity heaters, this flow rate is not much more, but it is sufficient for a small studio apartment to run a tap and a shower simultaneously.

Reduces water heating cost:

Like other tankless, Rheem also uses energy whenever you open the faucet for hot water. Moreover, it is 99.8% energy efficient, which is industry best and comes with a water saver shower head with 1.5 GPM output. Altogether, it helps you to save up to 60% energy cost compare to traditional water heaters.

Free up valuable space:

Those who live in a city like New York easily understand how precious space is. This powerful but small size heater will occupy 4 x 9 x 13 inches space of your bathroom or under the sink and allows you to mount easily on the wall too.

Enables precise temperature control:

Excess or under heat both can interrupt your comfort during a shower or do other washing jobs. Experience companies like Rheem address this well and set an external adjustable digital thermostatic control with LED display with +/1 degree accuracy, which allows you to set your desired temperature precisely.

Easy Installation:

It comes with a 1/2 NPT adapters and side 1/2 inch Compression water connections for easy installation. It also supported 240 volt 54 Amperage line so that you can connect through a 60A single circuit with only 3-foot 6AWG wire quickly.   

Easy to replace internal parts:

The internal component of this Rheem RTEX-13 made of robust copper immersion with brass top for increased durability. The durable Copper Immersion single heating element is also field serviceable.

Extensive Warranty:

Once you buy the Rheem tankless water heater, you will get five years warranty on the heating chamber and one year for other parts.

Pros

• Small, lightweight & easy to install
• Space-saving
• An excellent choice for a small household
• Components made out of copper and brass
• Comes with excellent energy efficiency
• Adjustable digital thermostatic control
• On-demand water heater
• Reasonable pricing and exceptional value

Cons

• You will get the best output when using in a single point
• It provides 4 GPM hot water flow only at 22°F temperature rise

How can I control or set my desired temperature on this device?

​The Rheem RTEX-13 has a digital interface with LED, which allows you to control the temperature with +/1 degree precision. The values processed 60 times per second in this digital controller.

What minimum and maximum temperature you can set in this device?

​The digital controller of the Rheem hot water heater allows you to set minimum of 80°F to a maximum of 140°F temperature.

What unique feature makes Rheem exceptional from others? 

​The following features are unique in Rheem RTEX-13 –

• External Adjustable Digital Thermostatic Control
• Field serviceable, durable Copper Immersion two heating elements
• Simple Installation – 3 Foot electric cable and 1/2 NPT adapters included; Side 1/2″ compression water connections

10. Rheem RTEX-24

Now we’re going to introduce another fantastic household tankless water heater from the same Rheem Company. Sure, sure! Our next Rheem RTEX-24 water heater comes with more power with three heating chambers that are ready to serve you 5.9 gallons per minute of water flow without wasting your valuable space or increasing energy costs.

Last update on 2021-10-24 / Affiliate links / Images from Amazon Product Advertising API

Features

Flawless Water:

Rheem tankless water heater comes with the most advanced self-modulation technology to adjust the power to meet hot water demand, which means you will get endless flow of hot water without any flaw.

Reduce Water Heating Cost:

The energy factor of this Rheem water heater recorded 0.99, which means there is almost no power loss. Moreover, it equipped with an advanced water flow regulator and temperature sensor, which uses energy only when need hot water. A combination of these technologies makes Rheem point of use tankless water heater is an efficient device that helps you to save money, water as well as conserve environment.   

Thermostat Control:

You will find thermostat control in many products on the market, but the Rheem comes with a unique feature, and that is external Digital Thermostatic Control with LED display (+/- 1-degree accuracy).

Digital Display:

Compact and stylish electronic temperature control with LED will help you change the temperature range from 80°F to 140°F in a percentage increase of 1°F. The screen must be capable of displaying the setpoint temperature in the Celsius and Fahrenheit temperature scales.

The unit uses a flow meter with an activation point of 0.3 GPM and monitors energy based on the actual flow rate and temperature of the inlet. Values are to be stored 60 times a second.

Durable and Replaceable Heating Element:

The internal heating element of Rheem RTEX 24 made of copper-clad immersion heating element(s) with brass terminations for increased durability. It is field serviceable and easily replaceable in case of wear and tear due to regular use.

Simple to Install:

It will take hardly an hour for a professional plumber to fix it, or if you do it yourself required no more than two hours, it that’s simple. The classical professional tankless water heater also supports you with a bottom 3/4″NPT water connections and three-foot electric cable.  

Warranty:

Like other Rheem, RTEX 24 also comes with five years warranty for the heating chamber and one year for parts.  

Pros

• Compact and Stylish
• Robust copper immersion heating
• Digital temperature display
• Simple installation
• Consistent and continuous hot water

Cons

• Though it claims the installation is simple, you have to spend a substantial amount on purchasing electrical elements like a 3x40A circuit breaker and others.
• Only rise 27 ° F temperature GPM hot water flow, means less effective in the winter season

What type of electric line and breaker required to install it?

​To install Rheem RTEX 24, you need 220v to 240v 100A line. Therefore, you need a panel consisting of a 3x40A double pole breaker.

What is the dimension and bodyweight of this Rheem RTEX 24?

​The bodyweight of the Rheem RTEX 24 is 17.8 pounds and dimension 18-1/4 x 17-5/8 x 3-1/2 inches that extremely suitable to hang on your bathroom wall or basement to get continuous hot water.

Is it suitable for multiple applications?

​Yes! You can use this device for hot water supply at bathing or showering, hand washing, bathtub, and dishwashing, clothe washing, at RVs, Restaurant, School, hotels, etc.   

11. Rheem RTEX-18

If you want to save more energy and cost without compromising family comfort, then you may rely on this Rheem RTEX-18 240v electric residential tankless water heater, which helps you to save up to 50% on water heating cost. Not only cost savings, but this is also the most dependable and innovative hot water solution that will give you a perfect degree of comfort, savings, and convenience as it comes up with 360°+1 design philosophy.    

Last update on 2021-10-04 / Affiliate links / Images from Amazon Product Advertising API

Features

360° plus one design philosophy:

Rheem analysis and evaluate every detail of the product base on homeowner’s experience while design its models. This process leads Rheem to develop the best tankless water heater electric on the market. That’s 360° Plus One.

Energy and cost savings:

Like other models, Rheem RTEX 18 heats water only when necessary, which helps to achieve 50% savings in point-of-use and 34% savings in full house use.

Space Savings:

The small, compact design of Rheem tankless water heater allows it to fit perfectly in tight places like a closet, under cabinet, and sink.

Instant, continuous hot water:

Incorporation of the most advanced self-modulating technology helps Rheem water heater to meet the hot water demand and supply ample hot water instantly. So, there is no more waiting and no more wastage of time and energy to get hot water.  

Easy installation:

Rheem RTEX 18 is compatible with 3⁄4 inch NPT connectors for flex hose installation as well as no ventilation and T&P valves are necessary, which makes installation works like a breeze. Although it is easy to install by a homeowner who has a little understanding of plumbing, for long-term operation, it is recommended to take professional advice or help.

Easy to maintain:

The internal heating parts of Rheem RTEX 18 also made of copper-clad immersion with brass terminations, which increase durability and make it easily replaceable. The threaded parts also make it field serviceable and easy to maintain.

Easy to adjust:

It comes with an external thermostat, which makes it easily adjustable temperature ranging from 80°F to 140°F with easy to read LED display (+/- 1-degree accuracy).

Great investment and value:

The simple to use and easy to own Rheem water heater comes with five years warranty on heating elements and one-year parts for peace of mind.

Pros

• External digital thermostatic control
• LED display with +/1 degree accuracy
• Most advanced self-modulation
• Auto adjustable power to meet hot water demand
• Durable Copper immersion two heating elements
• Field Serviceable
• Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement

Cons

• Performance may drop down by 25% in case of voltage drop at a level of 208V
• A bit of costly compared to other similar models on the market

It said that it is an ideal device for supplying hot water to the entire house. So, can I use it for a shower and a sink at the same time?

​Yes! You heard rightly. It can produce 4.4 GPM water flow by which you can run two standard showers and one sink smoothly. For more combinations, you may visit the operation manual.

Is it suitable for outdoor uses?

​It recommended for indoor use only.

Can I run it in the gas line?

​Nope! It is electrically operated and comes up with a copper immersion heating chamber.

12. Rheem RTEX-36 Residential Tankless Water Heater

In the tankless and electrical class, RTEX-36 is the biggest in Rheem. You can find all the features that have in other full house electric models (RTEX 18 to 27) in it. Nevertheless, it has four heating elements to generate up to 8.8 GPM of hot water flow-makes it the best whole house electric tankless water heater in its category.

Last update on 2021-10-04 / Affiliate links / Images from Amazon Product Advertising API

Although it needs 36,000 watts of power to produce an 8.8 GPM hot water stream, 99.8 percent of energy efficiency will not raise the electricity bill burden. It can, therefore, supply immediate, continuous hot water to up to 2 to 3 bathroom houses without any fault. You can use this compact low-profile residential water heater for other applications such as RVs, campers, mobile homes, travel trailers, and more.

Last update on 2021-10-04 / Affiliate links / Images from Amazon Product Advertising API

Features

Whole House Model:

Rheem RTEX 36 is a perfect model for the entire house for use simultaneous in a combination of either bathroom sinks, showers, and tub, or kitchen sinks and dishwashers, or detached buildings, cabins, workshops, and barns, or boat or RV kitchen and baths and similar. 

Instant and Continuous Hot water:

It has four heating elements, which are maximum in the Professional Classic® tankless electric water heaters series of Rheem and support the most advanced self-modulation to adjust the power, together with works to meet the continuous hot water demand.

Energy and Cost savings:

Save more than 50 percent of your energy cost with this Rheem electric tankless water heater as it uses energy only when need to heat water. Also, it is 99.8% energy efficient; as a result, no heat loss during hot water flow means extra savings on your electricity bills.

User-friendly digital interface:

It equipped with an external thermostatic temperature controller with an LED display, which allows you to set output temperature ranging from 80°F to 140°F with +/-1°F precision.

Easy Installation:

Though its body structure is a bit wider than other models in this series and required 4x40A circuit breaker panel to connect, once you start installing, it will not take much time, and you can do it easily with the help of an expert plumber.

Corrosive resistant long-lasting performance:

The WQA certified lead free and certified to UL499 and CSA C22.2 No.64. Rheem RTEX-36 has a copper-clad immersion heating element with brass terminations, which is corrosive resistant as well as long-lasting.

Great Investment and Value:

We have seen no difference in warranty policy for the Rheem water heater RTEX-36, and it comes with a five years warranty on heating elements and one year for parts as usual. Therefore, it will be an excellent investment in your home water heating solution.

Pros

• Quick turnover of your investment
• 8.8 GPM water flow rate
• Multiple application simultaneously
• Copper immersion four heating elements
• Easy installation
• Small profile to fit in tight spaces
• Self-modulation to meet your specific water demand

Cons

• Required four 40A double pole circuit breaker
• The amperage requirement is more than the small or medium home had

How much hot water flow (GPM), I’m going to get from it?

​It is subject to the temperature of the inlet water. You will get 2.5 GPM at 98°F temperature rise and 6 GPM at 41°F temperature rise.

Is it good enough for an apartment of 3 baths, kitchen sink, dishwasher, and washing machine?

​Yes! Rheem RTEX-36 design for a medium demand hot water of the whole house.

Is it shows the temperature in Celsius or Fahrenheit?  

​The display of RTEX-36 supports both Celsius and Fahrenheit. You can change according to your convenience.

13. ECOTOUCH Electric Tankless Water Heater

Are you concern about your family’s health? Then it’s time to switch over traditional water heater to modern electric one because conventional water heater’s bulk tank is a lying-in room for bacterial growth and rust issue.

Last update on 2021-10-06 / Affiliate links / Images from Amazon Product Advertising API

ECOTOUCH Electric Tankless Water Heater has no storage tank, and it separates water and electricity lines to avoid any contamination as well as calcium or mineral deposition. It also equipped with a digital display with a touch control panel, which makes the temperature setting likes a breeze. Only turn on the faucet and left rest on this smart machine, you don’t have to go through a hard temp setting lesson with a mixer tap without any clue.

Therefore, the ECOTOUCH water heater will be a SAFE and DURABLE choice for you.

Features

Sleek and Compact Design:

Ecotuch is the result of the rich experience of 20 years in appliance industries. They design the water heater is compact in size as like an oatmeal box and lightweight. Not only that, its 360° installation allows you to set it anywhere in any position. Therefore, its sleek and beautiful design easily matches with your home décor.  

Instant Hot water:

Once you open the knob and you will get immediate hot water flow at 1 to 1.5 GP at your faucet. There is no waiting time as there is not preheat or standby loss. You will get hot water flow 24h from it.

Healthy Water Quality:

As there is no reserve tank, there is no chance of growing bacteria or developing rust inside the heater. So, there is no risk of health-related issues.

Energy Savings:

ECOTOUCH equipped with smart modulating control for stable temperatures. When the hot water tap opened, the heater adjusts the input power according to the flow rate and the temperature setting, which means that it uses the power precisely what it needs to heat the water. It also keeps the temp stable to avoid hot scalding. Optimal energy efficiency is, therefore, guaranteed.

Multiple Safety Protections:

It comes with numerous safety protections like over-temperature protection to avoid hot scalding, dry heating protection, Leakage protection, over-voltage protection, and water and electricity line separated to keep the track active and protect it from the deposition of any rust and scaling.

Easy Installation:

To install ECOTOUCH smoothly, it includes all necessary parts like brackets, pipe fitting of ½-inch NPT, 10 AWG power cable, and an instruction manual. Only you need to arrange a double pole 30A circuit breaker, which is not an intimidating task. Its original compact design and water heater coordinates with sensor décor allow you to set it above or under the sink, horizontally, vertically, or obliquely. Now you got for installation either yourself and or hire a plumber.

Pros

• Elegant compact design
• Fire Retardant Case prevent any accidental loss
• Tempered LED with +/-1 degree precision
• Hygienic
• Suitable for POU
• Leakage protection safety feature
• 360-degree installation
• Premium Power cable, UL cable
• Stable temperature, no terrible ups & down

Cons

• Only suitable to use for the sink, not for shower
• Required professional help to install it

What is the scope of applications of this water heater? 

You can use it for a single point of use applications like in the kitchen or bathroom sink, hair salon, office, bar, RVs, and more.

How much water flow can I get from this unit, and what is the power requirement?

​ECOTOUCH consumes or requires a 5.5KW 240v line, and it can deliver 1 to 1.5 gallons per minute hot water flow based on inlet water temperature.

Does it come with a remote control?

Only the black model comes with remote control.

14. Rinnai V Series HE Tankless Hot Water Heater

Those who have a natural gas connection at home and are looking for a small or medium-flow water heater to cover 1-3 bathrooms building, Rinnai V Series HE Tankless Hot Water Heater will be the right choice for them. It is a high-efficiency tankless water heater that can deliver up to 6.5GPM of continuous and almost instant hot water flow whenever you need it. It is a super indoor style tankless heater that comes with the Control-R 2.0 mobile app with timers and schedules. Therefore, you could set the system up in holiday mode from a distance quickly.

Last update on 2021-10-05 / Affiliate links / Images from Amazon Product Advertising API

Oh! One thing we want to share.

You may notice that, up to now, we reviewed 13 tankless water heater and all of those run by electricity. Then, why we suddenly bring this gas model here?

Rinnai is a trendy and reliable name in the water heater technology arena. So, if we leave it, our list is going to be unfinished. Furthermore, we do not find a single unit from Rinnai that operating fully on electricity. The reason behind this is –

Rinnai mainly produces water heaters that are efficient enough to deliver hot water at least in a medium-sized home. However, it is damn expensive to reach that goal with electrical heaters, as those are typically either point-of-use or built for studio homes.

We found another reason behind the company’s development of only gas heaters, which is running costs. Although gas water heaters are more costly in terms of upfront (because of both the book value and cost of installation), the fuel to power them will cost nearly half as much as electricity.

Ok, let’s check out more unique features of the Rinnai V65in tankless water heater below.

Last update on 2021-10-05 / Affiliate links / Images from Amazon Product Advertising API

Features

Powerful and Efficient:

Rinnai V series water heaters are highly efficient non-condensing model. The energy factor of this model found 0.82, which measures higher than the most tank water heater. This dynamic model can develop up to 150,000 BTU power, which can deliver hot water capably even in colder weather.  

Endless supply of hot water:

As it is running by natural gas and can operable as low as 10,000 BTU, you will never run out of hot water. Moreover, you can set up to 140F temperature with it in single or multiple applications.

Cost Savings:

Although the installation cost and the upfront cost of purchase price are a bit higher than the electric tankless water heater, once you set it, you can get back your investment quickly as its operating cost is half than electricity.

Wi-Fi Ready:

Rinnai V series water heater is capable of connecting by Wi-Fi for remote operation. It supports the control-R 2.0 mobile app by which you can set timers and scheduling based on your water need. It also enables you to put the system into holiday mode from a distance for added safety.

Easy handling and installation:

This water heater supports a direct-controlled ventilation system and a closed combustion system, which removes the need to modify your home. Also, its small size of 14 x 23 x 9 makes it easy to manage and mounted on the wall.

Great investment and value:

Rinnai offers you an excellent warranty policy, which includes residential Factory Warranty – 120 months on heat exchanger, 12 months on free servicing (labor), and 60 months on parts – is a perfect valuation of your investment.

Pros

• Run up to 5 fixtures simultaneously
• Wi-Fi enable for remote operation
• Uniform energy factor rating 0.8
• Hot water temp lock prevents accidental change
• Various sensor for safety
• The built-in scale control system
• Ultra-Low NOx (14 ng/J or 20 ppm), environmentally friendly
• Approved by SCAQMD

Cons

• High initial cost
• Required natural gas line if not have earlier

I’m living in Alaska. So, can I get the hot water flow rate 6.5GPM as said?

​Nope! The outlet water temperature largely depends on inlet temp or groundwater temp. Usually, the groundwater temp in Alaska is 35°F to 42°F. At 35°F, the heater can produce 2.5GPM hot water flow.

Does it affect existing water pressure? 

​No. It does not have any effect on water pressure.

15. EcoSmart ECO 11 Electric Tankless Water Heater

Well! We’ve reached the end of our reviews, and we want to finish with one of the most popular and admirable tankless electric water heaters before closing. When we’re looking for our final contender, we observed a fantastic scenario – about 70 percent of the five-star ratings among 2,500 plus users who buy or use this product directly. Fascinating, Ha! Yes!  We’re talking about the ECO 11 model of the EcoSmart electric tankless water heater.

EcoSmart comes up with an offer of lifetime limited warranty on electronics, heat exchanger, and elements, which the best in the industry.

Last update on 2021-10-17 / Affiliate links / Images from Amazon Product Advertising API

EcoSmart has many models on the market, but we chose Eco 11 for a specific reason. It is the ideal water heater for a single bathroom or kitchen for showering or hand washing in colder climates and is suitable for a small or medium-sized house. In warmer climates, ECO 11 can supply continuous hot water up to 2.6 gallons per minute, supporting a bathroom with a shower or a kitchen sink. This model shows output temperature through a digital display panel and allows you to adjust the temp in 1-degree Fahrenheit increment. EcoSmart Water heaters are robust, lightweight, and easy to install.

Last update on 2021-10-17 / Affiliate links / Images from Amazon Product Advertising API

Features

On-demand Hot water:

The industry’s leading water heater EcoSmart is the most widely talked about tankless water heater product. When you mount the correct size of the EcoSmart tankless water heater, it will provide you with a constant hot water stream on demand. It warmth water as it flows through the system, instead of storing hot water like a tank-style water heater.

Energy-efficient:

EcoSmart is really a smart water heater that comes with a patented self-modulating technology that allows the units to control their energy output to ensure optimal water heating. Therefore, it is 99.8% energy efficient and will enable you to save about 50 percent of your energy cost over traditional water heater by cutting down heat loss.

Space Savings:

It not only save your cash but also design lightweight and wall mounted so you can save precious storage space for a new wardrobe!

Easy to use and install:

Patented self-modulating technology with digital display makes it easy to use, just open the faucet, and you will get hot water flow instantly. It is also easy to install as it comes with a compact design.

Limited lifetime warranty:

EcoSmart comes up with an offer of lifetime limited warranty on electronics, heat exchanger, and elements, which the best in the industry.

Pros

• Smart Water Heater
• Energy efficient – 99.8%
• Patented self-modulating technology
• Simple installation and use
• Threaded elements are easily replaceable
• A right point-of-use solution for small homes
• Limited lifetime warranty

Cons

• Cannot deliver enough hot water flow in colder climates
• Must be installed by a qualified and licensed plumber for the warranty

How much power does it consume to produce 2.6 GPM hot water flow?

​The unit run by 240v line connect through a 60A double pole breaker, and the rated wattage is 18kW. However, It has three 9KW heating elements, and all not run together. When you open the faucet, based on flow pressure, first start one exchanger then the second and then all. So, what seems from external specification, it consumes much less energy than that.

What is the range of temperature of this device?

​80 to 140 degrees Fahrenheit.

What is the maximum flow rate of the EcoSmart ECO 11?

​You will get 2.6 GPM water flow at 67°F temperature rise from this water heater.

11. Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric

It can be exasperating if you come home after a long tiring day and find no hot water. Even though you are paying your monthly electricity bills and you don’t have any hot water in your home. That’s so annoying. That is why these days, most people expect to have a tankless water heater instead of the traditional one. Stiebel Eltron Tankless Water Heater is a well-performing tankless water heater that you can have in your home. Before deciding on buying this product, I want to give you detail information so that it would be easier for you to choose. Let’s get rolling.  

Features

Advance microprocessor technology

This tankless water heater encompasses several flows and temperature sensors that repeatedly send signals to the microprocessor. And this microprocessor keeps tracks and adjusts the outgoing and incoming water temperature.  This unit adjusts a balanced output temperature if the flow rates increase or decrease. 

Electric temperature control system

You can set the temperature as per your need, and you can get the hot water with proper heat. 

Voltage input option

As per your need, you can fix the unit at 208v or 240v. 

Energy saving

Most advances technology has used in this tankless water heater. It will provide you excellent performance. Besides that, it will save your energy from 15 to 20%, which is better than a traditional water heater. If you are more aware of energy consumption, then you should have this one. 

Unlimited water supply

It has the capacity of water flow around 5.5 gallons per minute. So this will provide you endless hot water. And you have to wait until all the stored water finishes up. 

Safety  

When the device gets overheat, then you can switch off to shut it down. There is a manual reset option, so you don’t need to hire a plumber to fix it unless there is a critical issue.

No venting needed

Venting allows smoke, gas, or any form of air to leave from any place. Stiebel Eltron Tankless Water Heater doesn’t require any venting. You can set it up anywhere you want. 

Flow control system

This tankless water heater system offers an advance flow control system. The system enables a steady temperature control system as per your needs. It helps you to adjust the water flow. You will need this mostly in the winter season when the weather gets cold. You can handle the system manually. If you want to change the water flow, then turn the water flow option, and it will automatically deliver you more or less water with the correct temperature.

Pros

• Easy installation
• A flexible temperature control system
• No venting needed
• Energy-saving option, many users stated that they could able to save up to 20% electricity bill by using this product
• Fit and sleek to any place, so you don’t need to worry whether your position is narrow or wide.
• Complete and thorough user guide.

Cons

• The appearance and design is not that kind of fancy
• The parts and accessories have only three years of warranty
• If your home is too old, then you need to check the electric power system before the installation

Buying Guide

Water heater with a tank is around us for a long time. Tanks are good at providing hot water, but they have many drawbacks, and one of the biggest obstacles in their tank. Once the hot water has finished, it has taken some time to reheat the same amount, and if you need hot water precisely at that moment, you won’t get any. Usually, it happens in the morning when you’re in a hurry, and your former member(s) just finished their shower. Therefore, to get a continuous supply of hot water whenever you need, there is no alternative to a water heater without a tank. They not only provide you endless hot water flow but also save your money and environment.

 So, when you are going to select a tankless water heater, you have to consider some points to match it with your home, hot water requirement and budget. You also judge the manufacturing quality or warranty as well. To help you determine what to consider and whatnot, we prepare a list below. Please check out carefully.

Which Things you should Consider Before Buying an Electric tankless water heater:

Size and capacity:

Before purchase an electric tankless water heater, you should first decide where you use it, at home, office, or other point-of-use. You also calculate the number of fixtures you want to run by it. If you purchase an oversized than you have to bear extra electricity bills. On the other side, undersized heater will not meet your hot water demand. So, based on your prerequisite, you have to choose the correct size heater, either whole house, medium-size, or point-of-use electric tankless water heater.

Fixtures Type	Flow Size
Bathroom Sink	0.5 GPM
Standard Shower	2.5 GPM
Water-Saving Shower	1.5 GPM
Dishwasher	1.0 – 200 GPM
Washing Machine	1.0 – 1.5 GPM
Kitchen Sink	0.5 GPM
Laundry Sink	1.0 GPM

Water requirement based on house size:

House Type	Number of bathrooms	Water Flow
Apartment / Condo	1	3.0 GPM
Small House (<1000 sq. ft.)	1	4.0 GPM
Average House (<1600 sq. ft)	2	7.5 GPM
Large House (1600+ sq. ft)	3+	10+ GPM

Energy Savings/efficiency:

Besides getting continuous hot water flow, another important aspect of the transition from tank type to tankless is energy savings or high efficiency. Usually, we have seen that the tankless water heaters are shown above 98% energy efficiency against 80 to 85% of tank types. It measured by Energy Factor (EF). EF is the amount of energy that went into the water heater to heat the water. So, more EF means more efficient the device is.

However, energy savings depends on some other factors like hot water uses. If you use excess hot water, then you will unable to get significant savings on your energy bills.  Another factor is fuel type. Typically, gas-fueled tankless water heater can produce about 5 GPM hot water flow at 70 degrees Fahrenheit temperature rise. Whereas, electric tankless water heater can produce only 2 GPM hot water flow at the same amount of temp rise.

Whatever, tankless is the most energy-efficient water heater, and as technology improves, the demand is increasing. 

Smart functions:

Modern tankless electric water heaters come in many intelligent features including self-modulating technology to determine the energy requirement based on hot water demand, self-diagnostics, and temperature sensor to stop the heater in case of any emergency, remote control to scheduling and shut-off the system from distance and more. So heater also come up with overheat protection, dry heat protection, separate electric and water line to prevent any accident, etc. Check the water heater you are going to purchase, offer what kind of functions for your comfort.

Maintenance:

When it raised the question of maintenance, one thing comes in mind first, and that is build quality. Although most of the water heater made of metal, some are using corrosive resistant metal like copper clad immersion heating element, lead-free alloy, and so on.

If you choose a water heater which heating element made of corrosive resistant metal, it will save you from recurring maintenance costs. However, every heater needs intensive maintenance care in a specific interval, which increases the life of the heater.

Price and Installation:

Some electric heater needs an exclusive electric line like 240v 100Amp or more, for what you have to change or improve your circuit panel to connect it appropriately. Also, the installation cost varies based on point-of-use or whole house water heater. It is better to check the installation cost before purchase.

Price is another factor, or we may say the most crucial factor to consider. The cost of a water heater largely depends on its capacity and build quality. So, if you want a bigger and better quality heater, you have to spend more and vice versa.

Warranty:

Although all modern electric tankless water heater comes with high-end manufacturing excellence, a machine can fall in flaw anytime. Cover you at the worst moment, warranty is a great tool offered by the manufacturer. So, before purchase, check whether your device bears any warranty or not.

Frequently ask question

How does electric tankless water heater work?

Tank-free water heaters, also known as on-demand or instantaneous or point-of-use water heaters, are only intended to provide hot water when necessary. The standby energy losses accompanying storage water heaters are not made, which can save you money.

To understand their working principle of an electric tankless water heater, you have to know the main parts – cold water inlet, hot water outlet, and heating element. Coldwater enters through the cold water inlet of the device. Therefore, it passes through the heating element. While it passes through the heating element, the water gains temperature utilizing electric or gas burner. And after gaining temperature, water throughout from the hot water outlet or faucet. All these processes start when you open the tap, and as it directly heats the water, you will get hot water almost instantly.   

What size electric tankless water heater do I need?

Only a properly sized water heater can satisfy the hot water requirements of your home. Therefore, make sure it is the right size before purchasing an on-demand tankless water heater.

A tankless water heater is rated based on its maximum temperature rise possible at a given flow rate. Therefore, to get the correct size, you have to determine the flow rate and temperature rise.

To determine the flow rate, you have to calculate the total number of hot water devices that you expect to use at any one time and then add up their flow rate in GPM. For example, you plan to run a sink faucet (0.5 GPM) and a showerhead (2.5 GPM) at a time. Therefore, the flow rate through the water heater will be 3.0 gallons per minute.

To determine the temperature rise, you have to subtract incoming water temperature from the desired output temperature. Assume, the incoming water temperature is 50°F (10°C), and you set the output temperature at 120°F (49°C), then you need a water heater that capable to temperature rise to 70°F (39°C) for most uses. 

Once you know the above parameter, now you understand what the size of your water heater should be.

How to install electric tankless water heater?

The energy efficiency of an electric tankless water heater largely depends on its proper installation. For correct installation, you have to take care of some aspects like demand electrical connection or inlet, weather, local building code requirements, and safety issues.

Some water heaters are easy to install, and you can do it yourself, others need expert help. In case you need professional plumber or heating contractor to connect your device, do the following before selecting –

• Ask for cost estimates in writing
• Ask for references of previous work experience
• Check info of the company from the local Better Business Bureau
• See if the company has any permission from local authority and understanding of local building codes or not.

Or, if you determined to do-it-yourself, it is better to consult the manufacturer first. Usually, manufacturers supply the necessary installation and instruction manuals. Also, check the permit and codes about local water heater installation from city or town authority.

Once completion of all checking, then stop the main valve of the inlet water of your home and cut electricity connection for safety. Then connect inlet cold water and outlet hot water pipes with the device. Connect the wires with appropriate breakers. After all, set, run a test trial.    

One more thing take care especially, periodic maintenance of water heater is an important task that can extend your water heater’s life significantly and decrease efficiency loss.

Electric tankless water heater installation cost

The cost of installation of an electric tankless water heater varies on its design and capacity ranging from $100 to $4000. Again the installation cost depends on local labor charges (if you take help of expert plumber), material cost, tax credit, and permits.

Usually, the cost of installation of an electric water heater is ranging from $1000 to $1500. However, it may increase or decrease if you need additional wiring or require a new outlet to connect the device.     

Can electric tankless water heater be installed outside?

One of the significant differences between gas and the electric tankless water heater is its venting system. As in the electronic system, there not required any vent, and they are mostly suitable for indoor use. Also, the point-of-use electric water heater is preferable to connect as near as the faucet to get maximum efficiency.

However, if you have a space crisis and choose the whole house electric water heater, you may think of installing it outdoor too. But before doing that, you have to check whether it recommended by the manufacturer for outdoor use and equipped with any freeze protection system or not. Otherwise, your device frosting and damage in a freezing climate.    

Do electric tankless water heaters require venting?

Electric tankless water heaters usually use resistance heating coil or similar technology instead of the combustion system, which eliminates the need for exhaust burned gases. Therefore, there is no venting required for a tankless water heater electric.

However, for safety, it needs pressure and temperature relief valve to protect it from malfunction or overheat.

Electric tankless water heater problems

Although the manufacturer checks the unit before the sale, during regular use you may face some problems in the electric tankless water heaters. If you have little know-how, you can save your heater from possible damage and increase life expectancy. Let’s check some of those –

• Mineral Buildup
• System Overload
• Cold Water Sandwich
• Air Supply or Exhaust Blockage
• Ignition Failure
• Flame Failure

You may go through the instruction manual supplied by the manufacturer to take necessary precautions and get rid-off from the above problems quickly.  

Electric tankless water heater vs gas

At the beginning of our article, we discuss the advantages of an electric tankless water heater. Once again we explain them in short along with their cons.

Pros

• Instant hot water
• No venting required
• EF is higher than gas
• Low upfront cost
• Highly energy-efficient
• Low installation cost

Cons

• Lower rate of hot water flow than gas types
• Less effective in colder climates

However, gas type tankless heater also has some advantages and disadvantages.

Pros

• Lower operating cost in the long run
• Produce high hot water flow rate than electric
• The installation cost of condensing type gas heaters are less but not lesser than the electric one

Cons

• High upfront cost
• High installation cost
• Required venting, therefore need retrofitting of your house

Editor’s choice

Well, now you have got to know key features, specifications, and all the insights of these 15 electric tankless water heaters. It might be challenging to choose from these as each product has its standard and maintains the quality that a customer expects. 

I can suggest you buy Stiebel Eltron Tankless Water Heater. There are many reasons for choosing this product. First of all, this is one of the best tankless water heaters in the market. You don’t have to worry that if this water heater would be working or not. You need to set it up in any convenient position in your residence. Installation is pretty easy; once you do it, then you are good to go. 

This product doesn’t require any venting machine, and you don’t have to take the extra burden to clean it up. The temperature control system is much secure, as you only need to push a few buttons to adjust the temperature. 

There are many other vital factors behind selecting this product that I mentioned earlier. The best thing about this product is the energy-saving option. You may save up to 20 percent of your electricity each month that sounds good to me. 

So if you are looking for a tankless water heater for your whole house that won’t cost much and has excellent features, then I recommend you to choose Stiebel Eltron Tankless Water Heater.

Final Verdict

Thank you for your patient reading of our reviews and buying guide on the best electric tankless water heater. Hope after going through this, selecting a heater for your home or other uses will not seem intimidating.

It is crucial that you buy the right model for your needs depending on the fixtures to be used with the device while looking for the best electric hot water system for your home. The key factors to consider are the inlet water temperature (the colder it is, the more energy you need), and the levels of flow you need. 

We tried to orientation our reviews based on different usability and cover all the arena of hot water applications. Some are suitable for small homes, and some are medium or large, some are perfect for point-of-use where some others designed for whole-house uses. We also tried to explain all the technical advantages along with their cons to advocate the real scenario.

 Now what you need, determine your actual needs and budget to purchase the best one for your home.

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Author BIO

Dr. CHRISTIAN-JEVON BRAMWELL MD

Christian Bramwell, MD uses his own weight loss story as teaching for people struggling with their own weight through blogging, teaching, and writing. His mission in life is to promote health and education, that is why he has chosen to be a family physician and found his own nonprofit Project RAK based on education and empowerment.

NPI (Doctor proof number) – 1336632918 NPI Number: