Best Electric Tankless Water Heater Reviews and Buying Guides (Top 5 For 2018)

Are you ready to replace your old, bulky, and inefficient tank-style water heater? Today, there is really no need to keep wasting money and energy with traditional water heaters. There are various smarter and more efficient solutions available and electric tankless water heaters are definitely the easiest and the most functional way to satisfy your hot water needs.

We have looked at various tankless water heaters available on the market which run on electricity, and we have chosen 5 models that really stand out. Read on to see our top picks as well as a buying guide that will help you decide on the best electric tankless water heater for your needs. For those who wants to jump straight to our winner, here are our top pick.

best electric tankless water heater
  • Compact & well designed
  • Perfect for cold climates
  • Easy to install
  • Check Circle
    Energy efficient
  • Slight delay of few seconds before running water gets hot
  • Attention to details
  • High quality and durable
  • Compact, powerful
  • Energy efficient
  • Shorter warranty duration
ProductFeaturesRating

EcoSmart ECO 27
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Dimension: 17 x 17 x 3.625 inches

Weight: 13.75 lbs

Price: $$$
4.5/5.0



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SioGreen IR260 POU
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Dimension: 18.5 x 3.5 x 3 inches

Weight: 6.75 lbs

Price: $$
4.3/5.0



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Rheem RTEX-18
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Dimension: 15 x 4 x 19 inches

Weight: 8.5 lbs

Price: $$$
4.5/5.0



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Stiebel Eltron Tempra 24 Plus
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Dimension: 20.1 x 21.7 x 9.6 inches

Weight: 16.1 lbs

Price: $$$$$
4.8/5.0



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Bosch AE115 PowerStar
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Dimension: 15.5 x 15.25 x 4.5 inches

Weight: 20 lbs

Price: $$$$
4.0/5.0



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5 Best Electric Tankless Water Heaters Reviewed

1. EcoSmart ECO27 - Best Seller in the Market

Ecosmart ECO27 is one of the most powerful models in the EcoSmart line of water heaters. It can heat up to 6 gallons of water per minute, which is more than enough for a large household. It’s even strong enough for large Jacuzzi-style hot tubs. You can really count on this heater to provide hot water when you need it, which is why it’s considered to be one of the best tankless water heaters on the market.

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2. SioGreen IR260 POU - Best Value for Money

The SioGreen IR260 tankless hot water heater is perfect for a cabin or a small household where you need hot water supply for only one or two people. It is very compact and easy to install, so it will easily fit into any cabinet, bathroom, or kitchen, even if you have very limited space. The dimensions of the unit are 13.5 x 8.5 x 3 inches which makes this SioGreen model one of the smallest models available.

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3. Rheem RTEX-18 - A Simple and Reliable Water Heater

Rheem is one of the most well-known tankless water heater brands. They are known for making functional and durable products. The RTEX-18 is a compact but powerful unit with simple, rugged design. It will provide up to 7 gallons of hot water per minute, which is enough for small to medium-sized households.

This water heater comes with a LED display that tells you the exact temperature of the water coming out. You can adjust the temperature in one-degree increments. The temperature range is from 80 to 140°F.

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4. Stiebel Eltron Tempra 24 Plus - Top Notch Quality

Stiebel Eltron is a German company with a lot of experience in making tankless water heaters. They have been in the business for more than 90 years, so it’s no surprise they make high-quality and durable products.

Their Tempra series has been carefully designed to provide the best possible performance. All of the water heaters in this series are very functional and feature high-quality electronics. They also come with a hinged cover, which is quite a simple addition, but also very useful, since it allows for easy access.

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5. Bosch AE115 PowerStar - Instant Hot Water Under the Sink

Bosch is a German company with a long tradition of excellence. The company was founded in 1886 and today they make a wide range of high-quality household appliances, among other products.

Bosch AE115 PowerStar is a tankless water heater designed for indoor use. It was designed to replace a traditional water heater with a tank that holds 40 gallons and it can be used to provide hot water on-demand throughout your house.

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Tankless Water Heater vs Tank Water Heater

It doesn’t matter if you are environmentally conscious or you just want to save money - switching from a traditional tank-style water heater to a tankless water heater is definitely a good idea. There are a couple reasons for this. Keep reading to find out more on the benefits of tankless water heater.

Energy Efficiency

First of all, tankless water heaters provide hot water on demand, so they waste much less energy than traditional water heaters, even though tankless water heaters use more energy while they are operating.

This means that using an electric tankless water heater will reduce your water-heating bills. If your household uses less than 41 gallons of hot water per day,  you’ll be able to reduce the costs of water heating by as much as 34 percent by switching to a tankless water heater.

However, even if your daily needs exceed 40 gallons of hot water, a tankless water heater is still the more efficient solution.

Easy Installation and Maintenance

Second, electric tankless water heaters are not hard to install and require minimal maintenance. They are also much less prone to breakdowns and therefore much safer. Tank-style water heaters store large amounts of water for extended periods of time. This inevitably causes corrosion and limescale deposits over time, especially in areas with hard water.

If you switch to a tankless water heater, you will never have to face this type of problems again. You will never have to deal with replacing a ruptured tank, which can be a real nightmare.

Even when there is a problem, it’s much easier to find replacement parts for electric tankless water heaters. Actually replacing the parts is also a much simpler process than with tank-style water heaters. You can click here if you are looking for gas type water heaters instead.

Space Saving

Furthermore, electric tankless water heaters can be installed almost anywhere. They take up very little space, so they can fit into any corner or cupboard. You really don’t need a designated place in your house for a water heater, as is the case with tank-style water heaters that take up a lot of space. Many tankless water heaters can also be installed on outside walls with the help of an anti-freeze kit. Furthermore, propane tankless water heaters require venting, but the electric ones don’t, which makes them even more versatile.

No Hassles

Finally, there is the obvious benefit of endless hot water. If you choose the right size, you’ll never have to worry about emptying the water heater during a bath or shower again once you go tankless.


Electric Tankless Water Heater Buying Guide

Before you start looking for a tankless water heater it’s important to weigh out your hot water needs. For example, If you want to be able to run two showers and a faucet at the same time, you’ll need a water heater with much higher capacity compared to what is needed for running one device at a time.

To determine the right size of water heater for your needs, you’ll need to consider how many devices you want to run at the same time. Calculate how much gallons per minute all of the devices need together, and you’ll have the flow rate you need from your water heater. For example, an average faucet would have a flow rate of 1.5 GPM, while a flow rate of a shower head can go up to 2.5 GPM or even higher.

If you don’t know the flow rate of your home appliances, there is no need to worry. You can easily determine it yourself by measuring how much water flows out over a certain period of time. Just to give you a general idea, in areas with normal climates, 4 GPM should be enough to run a shower and a faucet at the same time. A tankless water heater with a 7 GPM flow rate will easily satisfy a very high demand for hot water, like running three showers and a faucet simultaneously.

The climate you live in is also a very important factor when choosing a tankless water heater.  You’ll need to calculate the temperature rise your water heater needs to provide. This will depend on the temperature of groundwater in your area. For example, if the groundwater temperature is 70 degrees F, and you want your faucet to run hot water at 120 degrees, that’s a 50 degrees temperature rise. If you live in an area where the groundwater temperature is lower than 60 degrees F, you should keep in mind that your water heater will need much more power to heat up the water to the desired temperature.

All tankless water heaters function in a similar way. Incoming cold water circulates through a heating chamber where it is heated up via the heat exchangers. In electric tankless water heaters, the heat exchangers are usually made of copper. This is because copper is a material with an exceptionally high thermal conductivity. However, there are some exceptions to this rule, like the SioGreen IR260 POU which uses far-infrared technology and heat exchangers made of quartz.

All of the water heaters on our list have a display that tells you the exact temperature of the water coming out of the heating chamber. This is really a necessary feature that every decent electric tankless water heater needs to have together with a mechanism that allows you to control the temperature. The temperature ranges water heaters offer vary, so this is another thing you should consider.

Many electric tankless water heaters also have a self-modulating mechanism. This mechanism allows the heater to automatically adjust to the hot water demand and use just the right amount of power. This way, you’ll have a stable stream of hot water and no energy will be wasted.

Finally, don’t forget to factor in the cost of installation when choosing a water heater. It’s much easier to install an electric tankless water heater than a tank-type water heater or a unit that runs on propane. However, you’ll most likely still need professional help. In some cases, the warranty on your water heater will be voided if you install the unit yourself, so always make sure to check if this is the case.

>> Looking for a suitable tankless water heater to incorporate with your home's floor heating system? Check out this article <<

Final Verdict

Ecosmart ECO 27 Electric Tankless Water Heater

Which electric tankless water heater should you get? The answer to this question will, of course, ultimately depend on your needs and the intended use. However, if we had to single out one best electric tankless water heater on the market, it would surely be the Ecosmart ECO27. It is not the cheapest unit on our list, but this water heater is definitely worth the investment. 

The EcoSmart ECO27 provides up to 6 gallons of hot water per minute, which is more than enough even for large households. Furthermore, it will provide a constant stream of warm water even if the inlet temperature is as low as 37 degrees F, which is really hard to find in electric tankless water heaters. With the sleek design and the precise temperature control, there is really no reason not to love this unit! Finally, no matter which model you choose, we hope this guide has helped you make an informed decision you won’t regret.

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