5 Electric Tankless Water Heater Reviews (Updated May 2019)


If what you want is reliable and instantaneous hot water supply, your best bet is an electric tankless water heater. Unlike the traditional tank storage units, tankless water heaters heat up water within seconds and only when you need it. This makes water available on-demand. Also, it helps you to save space and cut down on electricity costs in the process. But as you must have discovered in your search for the best electric tankless water heaters are not equal. Different products offer unique features and varying capabilities. At any instant, your list of options is unlimited. There are a lot of factors to consider. With all of these factors in mind we have and come up with a top-five list of some of the best electric tankless water heaters on the market. Here is a review of some of them. Starting with the comparison table, we however seen it needful for you to compare yourself to see what unit is ideal for you. 

Best Electric Tankless Water Heater Comparison Table and Reviews

BrandPoint of use Gallon Per MinuteWarranty Listing Price
Ecosmart ECO 364 fixtures 6 GPMLimited lifetime
Check Price
Stiebel Eltron Tempra
5 fixtures 7 GPM7 Years
Check Price
Rheem RTE 131 fixture4 GPM 10 Years
Check Price
Bosch WH27 Tronic1 fixture 3.3 GPM10 Years (limited)
Check Price
Atmor AT-910-27TP5 fixtures 2.5 GPM2 Years
Check Price

1. Ecosmart ECO 36 Electric Heater

Ecosmart is one of the leading manufacturers of tankless water heaters. The ECO 36 is another proof of the company’s ingenuity.  One of Ecosmart’s main focus as a company is to deliver top quality eco-friendly heating products to households. The ECO 36 stays true to that mission as it comes with advanced energy-saving technology. Consequently, you get to save up to 50% on heating costs while protecting the environment at the same time. Furthermore, this unit is inbuilt with self-modulating technology. This helps to regulate energy consumption according to the quantity of water you need. It also has digital temperature control which gives the user additional control over how hot you want your water to get. Ecosmart ECO 36 works perfectly for you whether you live in a medium-sized apartment or a flat. This heater is even more suitable for those with limited living space to spare.  It is up to 90% smaller than other tankless water heater units. Thus it is quite easy to install even in homes with small spaces. ECO 36 has been designed to deliver optimally even in cold climate areas. For this reason, we however classified it as the best electric tankless water heater for cold climates. More so, it can deliver up to 3.5 gallons of water per minutes even when the temperature is as low as 37°F. This water heater is capable of heating up water from two outlets simultaneously in cold climate areas. Furthermore, the output increases drastically in hotter regions as it can deliver water at up to 6.5GPM. Thus you can always be sure of constant on-demand water supply no matter where you live. This unit is built with durable Copper and stainless components which have been designed for optimal efficiency. The heating elements are quite easy to maintain and can be easily replaced as well.  This makes this water heater an excellent choice for any household.


  • Flow rate: 6 GPM
  • Warranty: Limited  
  • Voltage: 240 watts
  • Wattage: 27 kw
  • Applications: 4 point of use
  • Weight: 17 pounds
  • Dimension: 17.4 x 5.2 x 13.4 inches
  • Stylish and attractive design
  • Self-modulating technology
  • Digital controls allow you to adjust the
    temperature in increments of 1 degree
  • Durable, easy to maintain copper and
    stainless components
  • Lifetime warranty is voided if the unit
    is not professionally installed within 30 days of purchase
  • User ratings: rated 4.0
    by over 2000 users

2. Stiebel Eltron Tempra 36 Plus Tankless

Stiebel Eltron is another easily recognizable brand that makes some of the strongest water heaters in the market. The Stiebel Eltron Tempra Plus is a heavy-duty unit that is suitable for both commercial and residential use. Stiebel has been in the water and space heating industry for close to a century and the company has carved a name for itself as an industry expert.

The Tempra 29 Plus comes at a slightly higher price than many of the other electric water heater models on our list. However, the additional cost is well worth it. The unit is a good investment if what you want is a solid and durable product that delivers your water heating needs on demand.  The unit uses a combination of self-modulating technology and an advanced water control system. Because of this, it can easily compensate users for the high purchase cost. Additionally, the Tempra 29 is well engineered to serve users in both cold and warm climate regions. It can be fitted for whole house water heating. Also, it can serve commercial applications as well. At groundwater temperature of 40F, this unit can deliver water to increase the water temperature to as high as 140°F while delivering at 3.0 Gallons per minute. Furthermore, the output supply can be as high as 6.5GPM in areas with a temperature of 75F. Like all good quality tankless water heaters, this unit delivers on-demand water supply almost instantaneously. You get full control over your desired output temperature since it comes with a large control knob for setting the temperature according to your needs. In addition to this, Tempra 29 also features a thermostatic control which monitors water temperature and regulates it accordingly to ensure efficient power consumption. Thanks to this auto-modulation, you can save up to 15 to 20 percent energy by using this heater. What’s more? The Stiebel Tempra 29 comes with copper heating elements that heat up the water quite fast with constant distribution as well.


  • Flow rate: 7.5 GPM
  • Warranty: 7 years
  • Voltage: 240 watts
  • Wattage: 36 kw 
  • Applications: 5 point of use
  • Weight: 19 pounds
  • Dimension: 16.5 x 4.6 x 14.5 inches
  • The copper heating elements heat up
    water very fast
  • Efficient heat distribution delivering
    an endless supply of hot water
  • Auto-modulation technology allows you to
    save up to 30% energy
  • Silent operation
  • The unit is a little bit expensive
    compared to others on this list.
  • User ratings: rated 4.4 by more than 600

3. Rheem RTE 13 Electric Tankless Heater

The Rheem RTE 13 Electric Tankless Water is the smallest unit on our list. Nevertheless, what this unit lacks in terms of size and class, it makes up for in efficiency and performance. Rheem RTE 13 is also very cheap. This makes it quite an excellent choice if you are on a budget and still want to purchase an efficient water heater. Similarly, the cheap pricing also makes it a great choice if you are a first-time buyer who wants to test out tankless water heaters. This unit certainly won’t leave you disappointed at all.One of the most outstanding features of this unit is its small size and weight. It weighs about 8.5 pounds which is a lot less than many of the other products on this list. Again, the portability means simple and easy installation. This heater works great for those with limited space to spare. But don’t be carried away by the small size of this unit. Rheem RTE 13 is still a power unit that works great for small apartments and will still deliver optimally in larger ones too. Additionally, the compact size also means you will have no compatibility issues with your home electricity during installation. Rheem RTE 13 is one of the bestselling electric tankless water heaters on the market and for very good reasons too. Although it might not be suited for those who consume water heavily. It would work great for single shower applications in apartments, hotels, offices, and hospitals in need of on-demand hot water.  It has a rugged brass and copper heating element which heats up water pretty fast. There is a temperature control knob on the unit. Additionally, the unit has LED indicators to show when it is inactive or standby mode.


  • Flow rate: 4 GPM
  • Warranty: 10 years 
  • Voltage: 240 watts
  • Wattage: 1,3000 watts
  • Applications: 1 point of use
  • Weight: 7.35pounds
  • Dimension: 7.2 x 7.2 x 7.2 inches
  • It takes up very minimal space
  • Easy installation
  • It is quite affordable
  • It might not be suitable for homes that
    use a lot of water
  • User ratings: rated 3.4 by over 1000

4. Bosch WH27 Tronic Best Electric Heater

Another impressive piece of German engineering, the Bosch WH27 Tronic is one of the most sophisticated electric water heaters you can buy. To start with, Bosch is one of the pioneering brands of electric tankless water heaters. Thus you should take it from us if we say this is one of the very best options that guarantee optimum value for every dime you spend. With a compact and attractive design, this powerful water heater fits in almost everywhere. It can be installed both indoors and outdoors. Also, it works just fine for both residential and commercial applications. Furthermore, this product features a state-of-the-art polymer encased heating element. It also comes with a built-in flow sensor which automatically adjusts flow and ensures that you get a constant supply of water on-demand. In addition to these, an external control knob and automatic temperature control keeps the water just as hot as you want it to be. This unit guarantees consistency thanks to the electronic flow sensor. It can serve up to 4 major output points at the same time and still deliver efficiently without fluctuating. The thermal efficiency of this unit is top notch. There is minimal standby loss and you save on your energy bills when you use this water heater.


  • Flow rate: 3.3 GPM
  • Warranty: 10 years 
  • Voltage: 240 watts
  • Wattage: 120 A
  • Applications: 1 application
  • Weight: 19.65 pounds
  • Dimension: 15.5 x 4.5 x 12.5 inches
  • Sleek and compact design that is both
    attractive and functional
  • Ideal size for homes with limited space
    to spare
  • Highly durable unit
  • Built-in electronic sensor
  • It is relatively loud during operation
  • User ratings: rated 3.2 by over 100

5. Atmor AT-910-27TP ThermoPro

Atmor AT-910-27TP ThermoPro is built specifically for those looking to cut down electricity bills to the minimum. In fact, this heater can potentially reduce your energy bills by up to 50% thanks to a self-regulatory technology and a long list of other impressive energy-saving features. Atmor Thermo pro will automatically regulate how much energy is used up to heat up water based on the external temperature. In addition to the internal control, there is an external control knob that allows you to adjust the temperature according to your needs. The unit is triggered by water flow and activates automatically. It also shuts off on its own once you switch off the water supply. The Thermostatic control has a range of 90-135 degrees and can be adjusted with increments of 1 degree. Incoming water at a temperature as low as 37 degrees can be heated up to optimum temperature with an output rate of  2.2 gallons of hot water per minute. Higher output delivery is also expected for places with higher groundwater temperature. At optimum performance, this unit can supply up to 5 different outputs simultaneously. Thanks to a sleek design, the Atmor AT-910-27TP can be installed both indoors and outside. Installation is easy and no venting is required. The unit is easy to use with a promise of long term durability. The stainless steel interior is corrosion resistant. Thus, you can be guaranteed of a long life expectancy while operating at optimum efficiency.


  • Flow rate: 2.5 GPM
  • Warranty: 2 years 
  • Voltage: 240 watts
  • Wattage: 120 A
  • Applications: 5 applications
  • Weight: 17 pounds
  • Dimension: 17.4 x 5.2 x 13.4 inches
  • Easy to use digital settings with a
  • No buildup of minerals
  • Highly durable unit
  • Self-modulating technology ensures
    energy saving capabilities
  • The flow rate cannot be lowered due to a
    lack of pressure relieve gadget.
  • User ratings: rated 3.6 by 64 users

Why trust our electric tankless water heater reviews 

When it comes to buying tankless water heaters there are several options available. To make a good choice, you will have to compare your options based on various criteria. We have made that easy for you by reviewing some of the best products in the market in this article. But why should you trust us?

Asides the obvious fact that we are experts in the field; we have painstakingly selected some very great products from the top manufacturers in the industry. Our review covers top brands of electric water heaters of the highest quality. Furthermore, each of these products has been tested and reviewed by several users. We have gone through their feedbacks, complaints, and reviews as a guide. Every product on this list have been accessed based on following qualities:

  • Performance
  • Energy efficiency
  • Output flow rate
  • Temperature control
  • Durability
  • Ease of installation
  • Affordability etc.

Based on these factors and others, this list contains some of the best products in the market. They have been carefully reviewed with a list of their pros and cons to help you in making your final decision.  Bear in mind that having a good quality product is not enough. It has to be one that suits your need perfectly.  A heater can be good by all standards and still not meet your specific needs because of size, electricity requirements and other factors. Be sure to check these as well before making your final decision. Before leaving, check our guide on gas tank heaters also.


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