Best Electric Tankless Water Heater Reviews

How long have you been using your water heater? If the answer is 10-15 years, you should know that soon you will have to replace it. In that case scenario, you should consider tankless or better said on-demand water heaters. Here we will be focused on the best electric tankless water heater. As the name suggests, they use electricity to heat up water, but there are a lot of facts to know before you decide to purchase one.

Features Specifications Rating

Stiebel Eltron Tempra Plus
4.68 gallons per minute 21.7 x 20.1 x 9.6 inches
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Ecosmart ECO 11
1.5 gallons per minute 6.5 x 13.5 x 10 inches
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Atmor AT-905-11TB
1.7 gallons per minute 9.5 x 4.1 x 11.4 inches
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Rheem RTE 13
4.0 gallons per minute 7.2 x 7.2 x 7.2 inches
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SioGreen IR260 POU
1.5 gallons per minute 14.3 x 12.8 x 4.4 inches
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Here Is Our Top 5 Pick of the Best Electric Tankless Water Heater on the Market Today.

Stiebel Eltron Tempra Plus 24 kW, tankless electric water heater with Self-Modulating Power Technology & Advanced Flow Control

best electric tankless water heaterAll electric tankless water heater reviews of the model in question are more than just positive. The explanation is actually very simple. This is a high-end unit, designed and made by one of the best brands in the business. The model we have here has 24 kW power, but there are other versions as well. As a matter of fact, the range starts with 12 kW and ends with 36 kW. It is up to you which version you need. We chose this one because it offers the best value for money and it can meet demands of most users. After all, it is a modern and sophisticated water heater based on the latest technology.

One of the main advantages is in the advanced flow technology. As soon as the water heater detects that the water consumption is increased, it will reduce the water pressure in order to meet the requirement of a user. It is a very clever feature and it is rare, which made this the best alternative you have at the moment. We tested this technology and it actually works. There are no issues with it and it doesn’t have a negative effect on the overall performance.

Now we must add the fact that this model will help you save up to 20% on the electricity bill. If we know that it is durable, reliable and it will last for many years, we can deduce that it will repay itself in a few months. As such, this is a smart investment to make and it should be taken into consideration as soon as possible. Other facts you should know include small dimensions which allow for it to be installed anywhere you want and digital temperature control.



  • Doesn’t require ventilation
  • Saves 20% of energy
  • Modern and sophisticated
  • Reliable
  • Available in different versions



  • Expensive
  • User manual is too complicated


EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

The model we have here is all about energy saving. As a matter of fact, it offers the best savings rating among all other models on the market. It is 60% efficient! The secret is in self-modulating technology, which will use the least amount of energy at any given moment to heat up the water. This saves energy, obviously, but also makes the water heater more reliable than usual. On our tests, the unit performed well and we were unable to find some major issues.

Besides the technology we have explained, the model in question comes with a power of 11 kW, but there are more powerful versions as well. The most powerful version is 36 kW, so it is reserved for large families and households where hot water is mandatory. On the other hand, the model we tested is great for minor applications and for those who want to get the best out of a compact model. It is so compact that you will save 12 cubic feet of space if you choose this model!

Water flow rate is 2 GPM. The entire unit is 6.5 pounds heavy and the installation is one of the simplest we were able to see in the recent period. So, in a nutshell, you will get the best water heater, based on the latest technology and with great features. It also comes with a limited lifetime warranty, so this won’t be an issue for new owners. Keep in mind that the warranty covers only the main components.

Ecosmart 11 on demand electric water heater



  • Self-modulating technology
  • Saves a lot of space
  • Easy installation
  • User manual is too complicated



  • Water flow rating (for some owners)
  • Customer support


Atmor AT-905-11TB Thermoboost 10.5kW/240V 1.7 Gpm Electric Tankless Demand Water Heater with Self-Modulating Technology, 11kW/240V, Grey

All of you who are looking for electric tankless water heater which is designed for a single shower and comes with great performances will like the model we have here. This is a bit special model. First of all, it provides up to 1.7 gallons per minute. Then, it also uses self-modulating technology which uses the lowest amount of electricity to heat up the water. Nevertheless, the unit is more than just affordable, but the quality is outstanding. It isn’t very popular unit though, probably due to obsolete design and low flow rate. But, it saves energy, meets your requirements and it last longer.

There are different versions which must be mentioned. The most powerful will provide 2.2GPM of water flow which is better. In essence, the model is designed for simple use. It can be installed within minutes and it is extremely durable. All owners are perfectly satisfied with the overall quality and most of them say that they will make the same decision again.

We liked the value for money the most. After all, you are looking for the affordable electric tankless water heater, so we had to present you one. It is also one of the smallest models on the list and it weighs only 4.6 pounds. All we can add at this moment is that you are going to like this unit regardless of the main purpose you have in mind.



  • Quality
  • Value for money
  • Self-modulating technology
  • Available in different versions



  • Grey color doesn’t look great
  • Small display


Rheem RTE 13 Electric Tankless Water Heater, 4 GPM

The Rheem RTE 13 is probably the best electric tankless water heater for most of you. It provides 4 GPM and it is made to stay useful as long as possible. That’s why the overall quality is above average and this model is very desirable at the moment. You are going to like the fact it is simple, well-made and practical. Small dimensions make the installation possible literally anywhere you want and it is generally simple to install it. Keep in mind that it uses ½ inch connectors.

The digital control unit is located on the unit itself. It is very easy to control it, but it looks old. Nevertheless, the unit has the latest technology inside and it is very sophisticated. The warranty is decent as well. It is 10 years on the heating element, which is great, but the parts come with 1-year warranty, something we didn’t like very much. However, thanks to the quality, we believe that you won’t have to use warranty ever.

To summarize, the model we tested here is a great choice. It is a heavy-duty unit, therefore it is going to last for a long period of time. The price isn’t the lowest on the market, but it is still a decent investment. When it comes to the energy savings, you can expect about 20-30% lower energy bill.



  • 4 GPM
  • Simple and practical
  • Can be installed anywhere
  • Warranty on heating element



  • 1-year warranty on parts
  • Temperature control


SioGreen IR260 POU 240V/6kW/30A Infrared Electric Hot Tankless Water Heater. No Corrosion No Limescale

What if you are looking for something else, something completely new and different? In that case, you are going to need this water heater. It is actually based on all-new technology and it uses infrared waves to heat the water. As such, it uses less energy than similar models and it will last longer than all other models. The main advantage of this technology is in the fact there is no corrosion. Regardless of how long and how frequently you use it, rust won’t affect the water heater. The same applies to deposits from the minerals in the water.

The water flow is 1.5GPM and this unit operates under 60PSI of pressure. Installation is generally simple, although a bit more complicated than usual. We liked the fact the unit came with a great manual which is helpful and easy to understand. The warranty is 2 years, but if we add the fact there is no maintenance, you can understand why this unit doesn’t need a longer warranty. Digital temperature and a display are standard features as well. We also liked the display which looks modern and offers great visibility.

The main thing you will have to remember here is that this model is based on a new technology, it comes with great specifications and it is made to last. As a matter of fact, it is one of the best-made water heaters we encountered. Surprisingly, the price is lower than we expected, so we can add that this is the best investment you can make.



  • Infrared technology
  • Modern design
  • Digital temperature control
  • Display



  • Warranty
  • Water flow


Facts About Electric Tankless Water Heaters

The water heaters in question are more than just special, simply due to the fact how they operate. They obviously don’t have a tank, so the water is heated as it passed through the unit. That’s why they are more efficient, use less energy and bring a lot of additional benefits. Yes, there are tankless water heaters which use gas to heat up water, but there are plenty of differences between these two types.

The main difference when it comes to the best electric tankless hot water heater is that it will be more than just affordable compared to the gas-powered unit. Those models are expensive. Yes, gas is a much cheaper type of fuel to use, but the price of these units is generally two or three times more gas versions. Of course, it is up to you which type you will need, but most users are perfectly satisfied with electric models.

Electric models are more durable than gas-powered versions. They don’t have combustion so they are more sophisticated. Basically, they have several components inside them, including the heating element. Sadly, we cannot generalize the durability of these water heaters, but they last a few years more than gas-powered alternatives.

Now the main difference. All gas versions will require ventilation in order to be installed in a home. Electric models don’t. They can be easily installed, attached and used within a matter of minutes. It is up to you which model you want and keep in mind that the installation is basically the same for all types. Here we should add that location where a tankless water heater will be installed is important. In addition, the size of a water heater will have a huge role in choosing the location for installation. There are no additional costs which are needed for gas pipes and etc. so the installation can be free or far more affordable.

The last, but not least, electric water heaters can be used literally anywhere. They use less electricity than conventional models, so they can be easily powered by a solar panel. Add a battery to the equation and you will get massive savings and be able to use them off the grid. It is actually trending nowadays to use electric tankless water heaters for cabins in the woods and for homes in remote locations.

Efficiency has a huge role here. Thanks to the latest technology, electric tankless water heaters are far more efficient than conventional models. For example, those units which can supply your home with the same amount of water as 55-gallon tank water heaters are 4% more efficient. Models which are equivalent to 60 or more gallons tanks are up to 50% more efficient. Of course, all of this is an individual matter and it depends on the manufacturer, water heater, location and etc.

In essence, all electric tankless water heaters are efficient due to the fact they use as little amount of energy as possible in order to heat up water. There are no more reliable and more efficient models out there than the units we are discussing here. It isn’t strange why so many people decide to invest in a water heater of this type. In other words, it will repay itself in a few months or years, depending on a model.

New models are clever as well. We have been testing models which will automatically reduce the water pressure in order to maintain the stable temperature when more than one consumer uses them. For example, while taking a shower, someone is using a dishwasher, the water heater will perform the process we have just explained. This isn’t all. There are a lot of clever technologies being implemented into water heaters. Some can adjust the water flow, others can withstand freezing temperatures and almost all of them are resistant to corrosion.

In a nutshell, electric tankless water heaters are the best alternative at this moment. They offer so many benefits and they are reliable. On the other side, when it comes to the price, they are not as expensive as you may believe. We can even say that they are very affordable. Try to remember that all of them will save water and electricity as long as you use them.

Factors to Consider

Best rated electric tankless water heater is always the safest option but isn’t the only one. Basically, you will have to know something about factors of electric tankless water heaters before you purchase one. As a matter of fact, there are a lot of factors which have to be taken into consideration. They can make a true difference and they can help you get the most out of your new electric tankless water heater. We will guide you through the entire process and through all the factors which must be considered.

GPM (gallon per minute)

You may already know that this is the main factor to consider. Obviously, it refers to the amount of water which can be heated and provided by the electric tankless water heater per a minute. The more the merrier, but the price will be higher as well. The GPM will depend on several factors, including the size and the heating element inside a unit. They range between 1 and 12 GPM. Consider the space where the water heater will be installed. If it is too big for that location, switch to a smaller unit.


Size is important due to two factors. The first one is installation. Smaller models can be installed literally anywhere, while bigger ones do require more space, obviously. Space also may determine the GPM rating, so take all into account. A good thing is the fact that all newer models are generally small and they can be installed in various places, even under a sink.


Efficiency ratings will vary as well, depending on a model. Some of them can help you save up to 50% on water and electricity, while others will save 15%. Although this matter cannot be generalized, we noticed that the latest models usually offer higher efficiency. Nevertheless, the price isn’t significantly higher compared to other models, so this is an important factor. A good thing is the fact that al electric tankless water heaters are efficient and they will help you save money and water easily.


Each model requires different or specific installation. Some of them are more complicated to install than the others. Others are easier to install, but they do require special additions. In general, you can install this type of water heater all by yourself, but it is still a complicated matter. If you are doing all by yourself, make sure to look for videos and additional instructions on the web. Of course, user manual has an important role in the installation process

Number of people in the house

We could list this factor in the section of GPM, but it is extremely important, so it must be explained separately. Basically, the number of people in a house will determine how much water you need. It is known that a family of 4 will require an electric tankless water heater with 6GPM. This family will actually use 4GPM, but there are losses and situations when more water is essential. As such, a higher water flow rating is more than just important.

Anti-freeze technology

This isn’t an important factor, due to the fact all water heaters of this type will be installed inside a house, but it is still something we must mention. Those units come with several, additional elements which will prevent water from freezing inside a water heater. In a case water freezes, you won’t be able to use it, so you will have to live without hot water. Keep in mind that this is a rare feature and not all models come with it.


Why is climate an important factor to consider? Because it affects the water flow a tankless water heater can provide. Usually, those who live in colder areas will need a water heater with a higher water flow rating. On the other side, those who live in warmer areas will need a unit with a lower GPM rating. Important: Anti-freeze feature which we have explained earlier isn’t related to this factor.


A warranty has an important role in all of this. Best electric on demand water heater is affordable but isn’t a cheap unit. As such, a long warranty is definitely something you will need. Now, the duration depends on the brand, type, and the price range, but you can expect a warranty up to 12 years. Remember that this is a generic type of warranty. Parts inside usually come with shorter warranties, between 3 and 5 years. If you can get an extra year of a warranty, it is something you should do.

Drain valves material

Each electric tankless water heater will come with a valve. But, which material was used to make that valve? There are plastic and brass versions. There is no need to tell you that brass models last longer, they are more durable and they even look better than plastic versions. Plastic valves are sensitive and can break at any given moment, replacement isn’t complicated, but it is annoying and also, you will have plenty of water on the floor if that happens.

Digital display

A digital display will help you realize the temperature of the water at any given moment. Not all models come with this feature and unit is usually reserved for high-end units. But, it is still an interesting and appealing factor to consider. At the same time, it makes a unit more practical and better. These displays are durable, they are accurate and they offer superb visibility.

Digital temperature control

The digital control system is essential. It allows you to adjust the water temperature easily and within seconds. We must add that all of these systems are extremely accurate so they are great for users who want to get the perfect water temperature at any given moment.


Power is commonly revealed in kW and it makes a huge difference. The higher the kW value is, more hot water that unit can provide. It is common to see units which are based on the same technology and which offer great specifications but are available in different powers. Some even vary between 12 and 36kW, so you can make a difference here.

Materials of the inner components

Inside a tankless water heater, there are up to 10 different components. The real question is, which materials are used? You will have to look for stainless steel and copper. These two materials are the best when it comes to the duration and heating capability. Stainless steel is resistant to rusk and it is extremely strong. Copper is great when it comes to conducting heat, so it makes the overall result even better.

Mounting capability

We know that every single electric tankless water heater can be installed wherever you want, but it isn’t the case with some units. Due to the inner components, some models can be installed only on a wall. Others can be installed on a wall or on the floor. In order to get the best possible installation, you will have to choose a model which can be installed on the wall, shelf and on the floor. You never know will you have to move it to another position at some point in the future.


Which the best electric tankless water heater from the list is? It is the one that meets all your requirements. All 5 models are well-made, durable units which come with the latest technology and the latest features. We tested only models which provided us with hot water at all times and which are more than just advanced. However if we HAD to pick one, our choice would be the Stiebel Eltron Tempra Plus. This one is giving you the best value for the money.

If you think this article has helped you in any way, do share it with your friends. Similarly, you can also look at our best gas tankless water heater reviews.

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