Best Electric Tankless Water Heaters of 2022


Updated: January 2022

The best electric tankless water heaters can supply you with instant hot water on demand. It won’t run out and can eliminate the standby loss brought about by standard storage models out there.

If sized correctly, all products reviewed below can supply the whole house with hot water and keep the comfort of your family especially in the winter when they need hot showers. With an efficient unit, you can also rest assured that hot water will be delivered to all the outlets in your home, cabin or any other place where you have installed it.

In addition, the water heater does not need much maintenance unlike traditional models.  You won’t have to worry about algae, bacteria and lime scale.  And you don’t need to worry about how much space it will take up, as electric tankless water heaters are much smaller than comparable tank models. 

To find the right electric tankless water heater, see our reviews in the following section as we crown the best of this year.

Top 5 Electric Tankless Water Heaters [2022]

We’ve researched and compared the best electric tankless water heaters with the innovation and performance you’ll love! Don’t look any further but check out our collection of excellent water heaters that you can rely on and that offer the best value for your buck.

Top PicksFeatures
1. Ecosmart ECO 27
Ecosmart ECO 27
  • 27 KW
  • 112 Amps
  • 240 Volts

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2. Rheem RTEX-18
Rheem RTEX-18
  • 18 KW
  • 75 Amps
  • 240 Volts

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3. Stiebel Eltron Tempra Plus
Rheem RTEX-18
  • 15-36 KW
  • 50-150 Amps
  • 240 Volts

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4. Titan SCR2 N-120
Rheem RTEX-18
  • 12 KW
  • 54 Amps
  • 240 Volts

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5. Sio Green IR288 POU
Rheem RTEX-18
  • 9 KW
  • 40 Amps
  • 240 Volts

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Our Top 5 Electric Tankless Water Heaters Reviewed


1. Ecosmart ECO 27

EcoSmart ECO 27 Electric Tankless Water Heater

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The Ecosmart ECO 27 is one of the coolest options for a tankless water heater because it is designed and made with solid and reliable features and functions, which are unmatched for its affordability. It is a full line tankless water heater that can handle the heated supply need of a large family that requires a continuous heated water supply for different applications even in a cold climate. This unit can run two sinks and four showers without running out of hot water supply.


Automatic energy consumption adjustment

The ECO 27 is one of the most innovative tankless water heaters on the market. This unit boasts its self-modulating technology, allowing it to adjust energy consumption according to the amount of hot water required. If you are looking for a smart feature like this one, you might want to check out the ECO 27, which does not only give you unlimited hot water supply but also an efficient running that won’t waste energy.

Easy to adjust temperature

If you are looking for a tankless water heater that can offer you with an easy to adjust temperature, you might want to check out the Ecosmart ECO 27. It allows for one (1) degree increment adjustments to control water temperature based on your needs.

Advanced and cool design

The Ecosmart ECO 27 does not only offer you with an easy to adjust temperature but also has a cool and advanced design. it does not ruin the décor or design of where you are going to install it. The water heater is pleasing to the eye and matches any decoration.

  • Durable stainless and copper components
  • Space saving compact size
  • Easy parts replacement
  • Includes a self-modulating technology
  • Performance might dip with increased water flow rate



2. Rheem RTEX-18

Rheem RTEX-18

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The Rheem RTEX is the top electric water heater in our list and provides great value as either a whole house solution (typically up to 2 Bathrooms) or in a point of use application.  It is also so compact that it provides a lot of flexibility in installation locations, it could even fit under the counter.  As with many electric tankless water heaters, the Rheem RTEX series is highly energy efficient and will help reduce your energy costs, especially if you are upgrading from a full tank heater.  Note that installation will require 240V and adequate circuit protection, so make sure you have the proper electrical requirements.


Small / Compact design with big output

This electric tankless water heater is great for a tight installation, whether it is under the counter or in the back of a small utility room, the compact casing (less than 19″ on the longest dimension and less than 4″ thick) can fit in most spaces.  However, don’t let the size fool you, this heater still packs enough power to be the hot water source for a small to medium size house (great for up to 2 bathrooms).  Flow rates can exceed 4 GPM. 

Easy to operate and maintain

Buyers of this electric tankless water heater will appreciate the digital temperature display and ease & precision for changing temperature.  Just use the dial on the front to set your ideal temperature in 1 degree increments.  This unit is also easy to maintain and very durable.  Most of the heating elements are easily interchangeable and widely available from many sellers due to the widespread distribution of Rheem. 

Advanced Self-modulation

This technology is designed to increase energy efficiency and reduce your costs.  This feature quickly heats water when you need it to provide instant hot water on demand.  When you don’t, the heater conserves energy, saving you money. 

  • Rheem Reliability
  • Precise Temperature Settings
  • Install In Tight Spaces
  • Energy Efficient
  • Not For Larger Homes


3. Stiebel Eltron Tempra Plus

Stiebel Eltron Tempra Plus
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The Stiebel Eltron Tempra Plus is one of the most advanced tankless water heater on the market. You and your loved ones won’t have to wait long for hot water especially in the cold winter and day when all they need is a warm bath after a tiring, long day. It is what you need even if you have a large family that demands for heated water most of the time. This model is also durable and made of high quality materials, which make it the top choice for those looking to get more of their investment.


Unlimited heated water supply

You’ll love that this model can offer on-demand and an unlimited supply of heated water. Your family will continuously enjoy the heated water without having to wait long because of its powerful performance.

Sleek and intelligent design and construction

This tankless water heater does not only offer heated water unlimitedly for your whole family or business like a vacation home, cabin, bus, travel trailer, RV or any other applications where installing a huge water tank is simply impossible.

The tankless heater comes with a sleek design, which can help you save space and without any venting needed. You don’t also have to worry about any noisy operation because this product comes with an electronically activated heating element, which offers silent operation.

Efficient and fast heating

Another thing that makes the tankless heater great is its copper-sheathed heating element that is housed in a copper cylinder. This feature makes the tankless water heater efficient in heating and ensures that the water is heated quickly.

  • Space saving no vent required
  • Fast and efficient heating
  • Unlimited heated water supply
  • Sleek design and durable construction
  • Expensive


4. Titan SCR2 N-120 E

Titan SCR2 N-120 Electric Tankless Water Heater

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The Titan SCR2 N-120 runs of 220 volts and can operate quieter versus other models on the market do. The best electric tankless water heater by Niagara Industries is the one to choose if you want a reliable heater that can supply you with hot water as needed. It is also chosen by many because it can offer solid performance without interruptions. Especially in the winter when hot showers are what your loved ones need for ultimate comfort, they can rely on the unit that can provide continuous water supply.


Ideal For Different Applications

The Titan SCR2 N-120 can be used in a wide range of applications where hot water is needed. It is ideal for homes in areas where the temperature of incoming water is over 65 degree F. You might also want to go for the versatile model that can work for homes with up to three standard bathrooms.

Replaces A Conventional Water Tank

This best tankless water heater is what you need if you don’t have the space to install a new water tank. This model can easily replace a conventional model, allowing your loved ones to continue experiencing enhanced comfort and meet their hot water needs.

Heats Water Instantaneously

There is no need to wait long before you could get hot water for your sink or bathroom! Choosing the Titan SCR2 N-120, you can continue to get hot water for your needs due to the solid power and performance of this tankless water heater.

  • Can easily replace standard water tank heater
  • Unlimited hot water supply
  • Can work in homes with up to three bathrooms
  • Easy and quick installation
  • Not the cheapest available


5. Sio Green IR288 POU

Sio Green IR288 v2 POU Infrared Electric Tankless Water Heater

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If you are shopping around for a durable and reliable tankless water heater, you might want to take a second look at the Sio Green IR288. This unit offers a corrosion-free and cost-effective water heater that can offer you with hot water on-demand. With it, you don’t have to worry about bacteria, algae and lime scale. Virtually, you don’t have to maintain a water tank.

Sio Features

Space saving design

It has a compact and solid design, allowing saving kitchen or bathroom space. There is no need for a water tank, which also requires maintenance from time to time. A great deal of time and effort is needed with a tank to maintain, but not anymore, if you have the tankless water heater. This unit is useful for the entire house or commercial space.

Versatile and innovative

The tankless water heater is not only space saving but also flexible for different applications. It can also be used in kitchens, storage areas, bathrooms, cabinets or recreational vehicle.

You can install the heater anywhere or use it as a booster or hybrid with a water tank, in stores, hotels or restaurants. The versatile model is valuable to use anywhere you need hot water without the need for a tank.

Adjustments for your needs

It is certainly a great tankless water heater because it can also be adjusted based on your exact needs. This model boasts its Automatic Power Technology and Manual Mode. In this case, you can adjust its settings based on your family’s need. You can switch between the modes by just holding down the power button.

  • Selectable modes based on your needs
  • Easy to install
  • Can be used anywhere hot water on-demand is needed
  • Ideal for residential and commercial use
  • Expensive


Choosing an Electric Tankless Water Heater: Advantages and Disadvantages

The best electric tankless water heater has its pros and cons. We’re going to discuss some of them in the following, so keep reading.

Advantages of an Electric Tankless Water Heater

On-demand hot water supply

The tankless water tank can supply you with hot water anytime you need it. When cold water is flushed out of the faucet, it will provide instant hot water. Thus, your family will not run out of hot water supply for the kitchen, bathroom, garage and other places where it is needed.

Lower cost monthly

While the initial spending may be pricey, a tankless water heater still offers more cost-savings in the end. For one, they are more efficient than standard models. So if you would do the math, you might be able to save more annually.


If you would like to maximize your investment for this tankless water heater, you can also rely on the tankless models that we have featured here. The highest quality models can last for almost 10 years, and the tankless models can last almost double that number of years. Nevertheless, tankless models a can be longer lasting than standard water heaters are.

Tax breaks and special financing

Many of the tankless water heaters are efficient, so they can qualify for federal tax credits. In addition, Energy Star heaters may qualify for some tax breaks, too.

Standby loss elimination

These tankless water heaters can get rid of standby losses, which are common among traditional units.

Space saving design

You do not have to worry about the bulk that storage models can take. In fact, you might just have to wall mount a tankless unit in the basement for instance. Especially if you have a very limited space, you can take advantage of its space-saving design.

Considerations for moving to electric tankless

Fluctuating temperatures

One reported complaint among some water heaters is the inconsistent temperature they can produce. It happens when it cannot supply hot water to all the outlets at the same time.


The initial cost to spend on a tankless water heater is more expensive upfront, but in the longer term may be able to save you money because you do not have a water tank to maintain.

Additional equipment may be needed

You might have to buy a water softener that can help the tankless heater to operate more efficiently and properly.

There you have the pros and cons of having the best tankless electric water heater in your home, recreational vehicle, truck, camper, travel trailer and anywhere hot water is needed.

How to Choose the Electric Tankless Water Heater

If you would like to buy the right electric tankless water heater, you might want to check out the following for the important factors to look into when selecting this kind of appliance. Let’s discuss them in the following.

High quality: Everyone wants to get the most out of his investment. For this reason, you should compare and find out if the tankless water heater you’ll buy is of high quality. You can visit forums or read reviews about what other people are saying about the tankless water heater. It will help you figure out if they have a positive or negative experience in using a specific brand and model.

Energy savings: The tankless water heater to select should not consume much energy. Compare your options and look for one that can offer you with a more efficient operation to save energy.

Installation: One of the things to check when shopping around for a new water heater is its ease of assembly or installation. It should not give you a hard time or spend much effort in installing the tankless water heater. The one to choose should be easy to set up. In addition, it should offer ease of use so that you can experience convenience using it. Installing these heaters can be difficult, so be sure to contact a professional like to help.

Size: Remember that tankless water heaters are in different sizes. For this reason, you might want to go for a small one if you have a small space or a big one if you have a large space.

When determining the size, you might also want to think about daily water consumption and family’ size. By knowing these things, you will be able to figure out if you need a large or a small heater.

Flow rate: Another important thing to consider when finding a tankless water heater, either it is gas tankless water heater or electric type, is the flow rate. You should shop around for one that will not run out of hot water if its heating capacity is lower than its flow rate.

So for multiple uses, you might want to go for a larger heater or using several heaters. These heaters will work under varying climates and temperature, so you should determine the temperature that the heater can work most efficiently.

Efficiency: Another deciding factor is the efficiency of the water heater, which is its high-energy factor. When shopping around for one, you should look for a unit that has a range of between 0.96 and 0.99. Remember that a higher one can indicate that it is higher in terms of efficiency.

Brand: In addition to the above factors, you should also look into the brand and its reputation. It must be a trusted one for tankless water heaters to have peace of mind that they don’t also offer high quality products but also exceptional customer service, for instance.

There you have some of the things to bear in mind when finding a tankless water heater that will match your needs and space requirements. Consider them closely and find the right tankless model for you now.


Definitely, it can be challenging and overwhelming to shop around for a tankless water heater because there are many of them around. They are available in different sizes and configurations. For this reason, you have to determine your hot water requirements and size of your family along with the climate in your area and the temperature of the water delivered to your faucets/water outlets, among other things.

We do hope you can find the right tankless water heater based on the reviews we’ve created on the best tankless electric water heaters. Also, you might want to refer to our buying guide on the things to consider when comparing your options.

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