Reviews of The Best Electric Tankless Water Heaters of 2020

Published by Alexa Bartel on

Reviews of The Best Electric Tankless Water Heaters of 2020

Many people are making the switch from a traditional hot water tank to a point of use or on-demand electric tankless water heater — and for good reason.

There are several benefits to using these systems in your home including monthly electricity savings, cheaper up-front costs and easy installation.

In general, these products are used as point of use solutions under a sink or for single appliance use. When you are looking for the best electric tankless water heater for your home, it’s easy to be intimidated by the many different models on the market.

Every home and homeowner is different, which is why we’ve put together a comprehensive buying guide with tankless water heaters reviews to help you identify the right make and model for your needs.

IMAGEPRODUCT
  • The most powerful water heater in the market
  • Advanced flow control for enhanced savings
  • Compact design fits almost anywhere
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  • Advanced flow control for enhanced savings
  • Compact design fits almost anywhere
  • Runs 100% silent with no mechanical switches
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  • Industry leading brand in hot water heaters
  • One of the best warranties in the business
  • Adequate flow rate at 3.0 – 3.5 GPM
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  • Non-Metallic material requires no maintenance
  • Beautifully designed
  • Environmentally free
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  • A lot of power in a small package
  • Backed by industry leading brand
  • Great for cabins and cottages
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  • Highly energy efficient (save 50%)
  • Adjustable LED Display Temperature Controls
  • Great safety features
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  • Durable Stainless Steel design
  • Energy-efficient Temperature Adjustment
  • 1, 3. 5 yr Warranty
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  • Easy to install
  • Adequate 3.5GPM Flow Rate
  • Economically priced
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  • Smart-enabled Temperature Control
  • Great for 2-bathroom household
  • 5 yr warranty
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9 Best Electric Tankless Water Heaters Reviews of 2020

Stiebel Eltron’s flagship product, the Tempra Plus, is one of the best electric tankless water heater models on the market. With one of the highest GPM flow rates available at 4.0 GPM and the ability to raise the temperature 50F, this model provides the best performance you can expect from this type of heating system.

We love that even though this tankless electric water heater is the most powerful you can find, it is not much more expensive than a unit half its size. This makes the model all the worthwhile when paired with its modulating power technology and advanced flow control.

The Tempra Plus is one of the only one of its kind to also have advanced flow control. You can limit the amount of flow when hot water is not required, resulting in even more energy savings. Think of it as Eco Mode.

For more information on advanced flow control, have a look at this short video:

While this unit is the most powerful you will find in electric tankless, it is not powerful enough to provide hot water to an entire home. We would recommend installing a unit in each room that requires hot water. It is powerful enough to run a shower and a bathroom sink; a washing machine and laundry sink or a dishwasher and a kitchen sink.

Pros:

  • The most powerful water heater in the market
  • Advanced flow control for enhanced savings
  • Compact design fits almost anywhere
  • Runs 100% silent with no mechanical switches

Cons:

  • Slightly more expensive than heaters
  • Design isn’t elegant; you’ll want to hide the unit

The bottom line: If you want the best electric tankless water heater available, and don’t mind spending a few extra bucks, this is the unit for you.

Read the full in-depth review: Stiebel Eltron Tempra Plus 36 kW.

The EcoSmart ECO ranks second on our list of tankless electric water heater reviews. The model (Eco 36) boasts one of the best GPM flow rates available at an impressive 3.5 GPM with a temperature rise of 40F. It may not be as powerful as the Tempra Plus, but this instantaneous electric water heater is generally sufficient to supply an entire room, such as a kitchen, bathroom or laundry room.

If you are looking to power your entire house with an EcoSmart ECO 11 installation, you will need to purchase several units – ideally one for each room.

As you’ll see with the rest of the items on our list, both the EcoSmart ECO and the Tempra Plus are in their own class. Their performance is roughly similar and sufficient for any’s room needs. When it comes to design, the EcoSmart isa clear winner, If you need to place this in a laundry room, it will have an elegant and modern feel even if it is exposed.

Pros:

  • The most powerful model on the market
  • Advanced flow control for enhanced savings
  • Compact design fits almost anywhere
  • Runs 100% silent with no mechanical switches

Cons:

  • Slightly more expensive than others
  • Design isn’t elegant; you’ll want to hide the unit

 The bottom line: If you want the best electric tankless water heater available, and don’t mind spending a few extra bucks, this is the unit for you.

Read the full in-depth review: Ecosmart ECO 36 36kw 240V.

Rheem’s top model, the Rheem RTEX-18, offers some of the best value. In addition to the peace of mind you get when buying from a company that has been around for decades, you get most of the features available from premium models at a lower price. The premium brands usually cost more, but with this model, you can get the big brand for less.

Rheem claims that this unit is a 4 gpm system, but real-world tests with cold incoming water, reflected in rheem tankless water heater reviews, have found that 3.0 – 3.5 GPM is more reasonable to expect. Of course, 3.5 GPM is a sufficient flow rate to power the needs of almost any room in the house.

The challenge with this is that it may take up too much space under a sink. In addition, it isn’t the most visually appealing unit either. But these might not be factors for you, if you have lots of hidden space to place the unit.

Pros:

  •  From the best electric water heater brand
  • One of the best warranties in the business
  • Adequate flow rate at 3.0 – 3.5 GPM
  • 99.6% energy efficiency
  • Great price

Cons:

  • Larger than most units, not suitable for small spaces
  • Does make some noise, although it’s not loud

The bottom line: If you want good value and a good brand for an affordable price, this unit is for you.

If you live in an area with particularly hard water, or you are looking for a heating system for an RV or tiny home, you should consider the SioGreen IR260.

This model was made with non-metallic materials, meaning that limescale doesn’t build up in the unit. Thanks to this innovative technology, this is one of the only heating products on the market that doesn’t require any maintenance.

Of course, this tremendous advantage is not without its downside. The SioGreen IR8000 isn’t capable of very high flow rates at a 50F temperature rise. It is definitely best suited in late spring to early autumn or in warm climates that don’t require a high-temperature rise.

Infrared technology in these systems is a relatively new technology and we expect to see improvements over the coming years. After all, the maintenance aspect of going tankless can be a challenge for many people.

It is also worth noting that this model is visually appealing and looks as high-tech as it is. This product is advertised as a whole house tankless water heater, but we think you’d be disappointed if you purchase a single unit for an entire house.

Pros:

  • Non-Metallic material requires no maintenance
  • Beautifully designed
  • 99% energy efficient

Cons:

  • Not as powerful as other units available for the same price
  • Somewhat expensive for the value

The bottom line: If you don’t want to bother with annual maintenance and don’t require a lot of power, this unit is for you.

Read the full in-depth review:  Rheem RTEX 18

Rounding out our list of electric water heater reviews is this Bosch model – a compact, highly efficient unit that uses very little energy and it is backed by a premium brand.

This could be exactly what you need if you have very modest heating needs. If you are looking for a simple unit to install in your summertime cabin or cottage for a small bathroom, this is the best small electric water heater. For less than $200, you can enjoy hot water just like at home!

If you are looking for the best electric hot water heater for whole house needs, however, this may not be the system for you.
That said, this model can also be suitable for providing hot water to a sink. Anything more than that and this will prove to be insufficient. That said, there is no need to spend a lot of money if your needs are modest.

Pros:

  • A lot of power in a small package
  • Backed by one of the best tankless water heater brands
  • Great for cabins and cottages

Cons:

  • Not powerful enough for cold incoming water temperatures
  • A little louder than we’d prefer

The bottom line: If you want a small, simple and affordable unit for the summertime, this is the perfect unit for you.

Read the full in-depth review: Bosch Electric Tankless Water Heater.