10 Best Electric Tankless Water Heater Reviews 2021

The best electric tankless water heaters are the affordable and most efficient option to have this winter. Like gas-powered heaters, electric systems also cut down your energy bills and provide you with continuous hot water without tank limitations.

Regardless of your location or home type, these water heaters suit all applications. According to research, the electric tankless water heaters record more thermal efficiency, i.e., 78% – 85%, and save up 60% energy bills each month.

Thus, we have done scrolling and research to help you choose the perfect unit. This blog shows the top ten models by the top sellers and high quality and ratings.

10 Best Electric Tankless Water Heaters

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1. EcoSmart ECO 27 Water Heater – Best Rated Electric Tankless Water Heater

Eco-27 is one of the most powerful electric water heaters by EcoSmart and is designed to support on-demand heating applications. It is efficient to work in the coldest climates. Mostly, customers have bought this heater for use in lake houses, cabins, and vacations. As compared to other heaters, what makes it a favorite, it’s the price. It is reasonable. It is a great option for medium households with high demand or cold climate regions.

This stylish white painted tankless heater can heat three gallons per minute in cold climate regions and up to six gallons per minute in warm climate regions, which is an excellent output. This electric heater is a more consistent option than Rheem in colder areas for the use of 3 to 5 persons.

Overall, the EcoSmart water heater has the same regulatory or control system as Stiebel. You can also adjust the power and pressure from settings to keep your choice or preference output. Moreover, it also comes with a lifetime warranty by its manufacturers, making it the best option for you.

Pros & Cons

  • Energy efficient
  • Offers warrant
  • Affordable
  • Stylish
  • Easy to control
  • Not for large families

Save your electricity bills with this diva that is highly energy-efficient and performs great even in the coldest areas. It is an affordable, stylish, and user-friendly product that is totally recommended for medium-sized families.

Read: Best Water Dispenser – Reviews & Buying Guide

2. Stiebel Eltron Tempra Plus Heater – On Demand Water Heater Electric

This is another amazing and efficient product that is imported from Germany. We are amazed by its innovative and outstanding design, which makes it step up from its market competitors. It is a precise product and best to purchase for the long run because it is not cheap. It is designed for large families or households with two or three bathrooms where demand is high for hot water.

The smart Tempra Plus is based on advanced technology that offers automatic internal settings to efficiently regulate energy use. This design supports minimal or zeroes energy wastage. For high use, it will adjust the flow of water inside and helps in giving the warm water in frigid temperatures.

Many of us are facing low or lag output issues in water heaters where you need to switch on the other source, i.e., faucet, to support your electric heater, which is also hectic. But, the Tempura plus offers automatic adjustment in real-time by regulating the temperature. The overall functioning of this tankless electric heater also prevents temperature fluctuations.

Pros & Cons

  • Minimum energy wastage
  • Support large families
  • Best in performance
  • Precise design
  • Support advanced regulation
  • Expensive

Overall, the Tempra has a unique system that is effective and great for long run use. It is ideal for large families and comes with a three-year warranty.

Read: Best Bottom Loading Water Dispenser Reviews

3. Stiebel Eltron – Best Electric Tankless Water Heater

The Eltron water heater has accounted for many positive customer reviews. It is a sleek design heater that will save your extra space as it does not need any venting. On the front, there is a digital display that shows the exact temperature. It gives you access to temperature settings so that you can regulate the temperature from pre-set buttons at your convenience. It is also an energy-efficient option in the market.

The Steibel Eltron is mainly based on the Advanced “Flow Control Technology.” This latest technology aims to save energy consumption and improve the overall performance by flow control solutions in heaters. It helps this electric tankless water heater to maintain the water temperature automatically for comfort and ease.

Along with that, it comes with seven years leakage warranty and three years of part warranty. This makes you relaxed even if your heater causes any disturbance. In summary, this energy-efficient and the silently operated product is a must-have for this winter season.

Pros & Cons

  • Based on energy-saving technology
  • Silently operation
  • Comes with warranty
  • Compact design
  • GMP output could be increased

The Stiebel Eltron is a great product based on advanced energy-saving technology, which helps you cut down your electricity bills and automatically regulate the temperature.

4. Rheem Tankless – Top Rated Electric Tankless Water Heaters

The RTE-13 by Rheem is another best tankless water heater that is trendy in the market. We have not recommended this product only based on its popularity; there is a lot more to discuss.

It is an efficient, compacted, rugged, and durable model to have in your home. This model is also updated to a new version called RTEX-13 because of the customer’s demand. The new model has a digital thermostat and is more user-friendly; however, the other setup and programs are almost the same.

If you need the best electric water heater for yourself, this product would be great for you because it is designed for use by one to two persons. It is a very convenient option for guest rooms or hostels etc., where there is only one shower at a time. To be more clear, being suitable for a small household does not mean low output. This heater has a flow rate of four GMP, which is great for this price. Overall, it is one of the most compact and user-friendly options on our list. You can even place it in a cupboard or above the sink.

This is a reliable product with the great build quality, which makes it durable than other Rheem products. One of the main reasons behind its good reputation is its build quality. Moreover, you can get all this on a meager budget. It can also lower down your energy bills in the future that makes it the overall cheapest investment.

Pros & Cons

  • Great build quality
  • Durable
  • Reliable
  • Not expensive
  • Compacted
  • Lacks smart technology

People living in small houses or one room hostels will benefit from this amazing and best performing electric heater. It is a durable, cost-effective, and energy effective product.

5. Ecosmart ECO Mini – Instant Electric Hot Water Heater

This is another best electric tankless water heater by EcoSmart. As the name indicates, this Mini heater comes with a compacted and sleek design that can fit at any place, even in the cabinet. The Mini heater series by ECO is known to be more than 99 % energy efficient.

The best thing about this tankless water heater is that it is effortless to install and does not need any previous installation knowledge. Like if you are a beginner, then this heater is best suited for you. It is designed in the US and has a total amperage capacity of 12 A, and typically runs on 120 V voltage.

Moreover, it also comes with a five years warranty by EcoSmart. The company also has good customer service, so you don’t need to worry even if your appliance stops properly working. Overall, this mini user-friendly heater is totally recommended.

Pros & Cons

  • Compact design
  • 99% energy efficiency
  • Comes with warranty
  • Easy to install
  • The user’s manual should be updated

This is a sleek design water heater best-suited for people who don’t know how to use water heaters before. It is very to install and operate and give out more than 99% energy efficiency.

Read: Best Water Dispensers For Home Use

6. Ecosmart ECO Water Heater

EcoSmart is a trendy brand in the market for producing high-end performing water heaters. Another best heater by EcoSmart is “ECO 36,” which is the most energy-efficient tankless water heater available in today’s market.

It is based on patented technology, which slices down your electricity bills in half. Also, it features automatic temperature modulation and control mechanisms, which can detect the changes in water temperature of even less than 1-degree Fahrenheit. This system can help in maintaining the temperature with high accuracy.

According to our research and experience, Eco 36 is one of the best tankless heater models as one of the best cost-effective solutions. It is a conserved or compact model that won’t need any prior setup for installation, so basically, you don’t have to spend many bucks for its installation. Therefore, overall it is a cheaper deal!

Along with that, it comes with a 0.3 GPM activation flow rate and a 6 GPM system, which gives a high-end hot water supply very conveniently. It is a small and perfect edition for apartments or small homes. It is made up of good quality material, i.e., stainless steel and copper, making it more energy-efficient. The lifetime warranty and durability is another factor that makes this product one of the significant choices to consider.

Pros & Cons

  • Requires less space
  • Cost-effective
  • Easy to install
  • Features LED display
  • Accurate temperature adjustments
  • Water leakage reported

The premium compactness makes this product a great choice because no one is ready to bear the installation issues and have a separate heater space. This is also a cost-effective option in the market with marvelous performance.

Read: Best Hot Water Dispenser – Top Picks

7. Rheem RTEX-24 Water Heater

Another best electric tankless water heater by Rheem is “RTEX – 24,” which Amazon’s choice. This model comes with extraordinary features and is based on advanced units that facilitate high precision and best performance. There is an LED display and a digital thermostat that shows the temperature reading on the front side. With the control panel, you can regulate the temperature at your convenience.

Moreover, it also has “self-modulation technology,” which allows the heater to regulate and adjust the water temperature by itself. Through this feature, you can continuously get hot water even in the coldest regions. This feature also gets you rid of the manual regulation and fear that you have with gas heaters. This electric heater is amazing to have for medium-sized homes. Along with that, it offers easy installation because the bottom or base of the heater features 3 by 4 inches NPT connections.

This product is not similar to other Rheem products because it has three major “heating elements,” which are constructed with copper immersion. It comes with a 5.9 GPM flow rate. The premium building gives this heater more durability and also helps in consuming less energy than conventional heaters. Furthermore, RTEX -24 is a threaded model that offers replacement of parts.

Pros & Cons

  • Self-modulation
  • Heating elements
  • Offers easy installation
  • Good flow rate
  • Durable
  • Solo faucet use

The build quality and creative design make it a great option in the electric heater market. It is effortless to install and operate because of the digital control panel and display.

8. Titan SCR2 Electric Water Heater

The Titan SCR 2 model is a outclass electric tankless heater manufactured in collaboration with “Niagara Group of Industries”. The SCR 2 is a 220 volts electric heater with tankless water technology. It is designed for home use where there is a need for constant hot water but low cost. This electric heater comes with great features at an affordable price so that even students who live in hostels can afford it. According to manufacturers, it is a low price and high quality tankless electric heater which is necessary to have.

The weight of this compacted and user-friendly electric heater is only eight pounds. It has no surface or wall virtually for installation. It is tailored for any area, regardless of installation excuses. You can even have this necessary appliance in your office. Moreover, it is constructed with tan steel that accounts for its stylish and classical look. Believe me or not, you can even put it in your room!

To provide continuous hot water, the Titan experts designed this heater with 11.8 kW hot water flow. The best thing about heating water with this appliance is that it works only when you need it. This feature helps in saving the wasted power which conventional heaters utilize. You can call it a “robot heater” that acts on your command. This heater is a great choice with 4.0 GPM, more than 90% energy efficiency, and affordability.

Pros & Cons

  • Affordable
  • No energy wastage
  • Looks classy
  • No hectic installation
  • Warranty
  • Need specific inlet temperature

This is the best tankless electric water heater for the whole house, especially the families concerned about the total cost of energy bills. It is a fast and convenient option for cutting bills.

9. Bosch Electric Tankless Water Heater

The WH 27 by Bosch Electronics is a true example of “getting what you have paid for!”. It is based on thermo-technology and delivers high-end performance at a deluxe price range. This water heater is relatively expensive than other products, but this product is considered in this article because of its amazing specifications and premium work.

It is a good choice if you want to invest in an electric heater this winter. In short, it is worth every single penny you invested in it as it supplies endless warm water with the least consumption of energy. So it would be a long term investment which saves you energy bills in the future.

With this electric heater, you will get 97 % energy efficiency, and we bet that you will not find a water heater superior to that in today’s market. There are indeed affordable or cheap models available, but this is categorized as best due to the efficient nature. Along with that, it offers supreme temperature control actions, which cut down all the hurdles related to your previous model. When you switch your old or conventional heater with this one, you will definitely notice a reduction of about two-thirds of your monthly bill.

Furthermore, this electric heater has premium building quality. It weighs less than just 20 pounds, and you can easily mount it on the wall or at any surface in your household. The elements of this heater are capsuled in good quality Polymer material that ensures temperature consistency. Overall, you will be getting great performance with this best tankless water heater. Let’s suppose if you don’t get that? You can then easily return it to manufacturers at zero cost due to their fantastic warranty and return policy.

Pros & Cons

  • High-end performance
  • Highly energy efficient
  • Temperature control is great.
  • Offers return policy
  • Expensive

This electric heater is a great investment for saving your monthly energy cost in the future. The factor which amazes the audience is their “Return policy,” which enables you to return the product at no cost.

10. Rheem RTEX-27 Water Heater

Rheem group of manufacturers is a leader in the market. This section will discuss REX – 27, a high-end performing tankless water heater for or residential applications. This product has a user-friendly design with a minimalistic look. It is operated to deliver powerful hot water by maintaining 99.8% energy efficiency, which is quite impressive.

This model is designed to provide ultimate performance for years. It has plenty of features that make it one of the most demanding and comprehensive models on our list. Mainly, the “self-modulating feature” makes it a step forward than other market competitors. REX 27 also offers a sizing tool that helps you find the right unit according to your household needs. It is designed to deliver 4GPM at a temperature of 46 F mentioned in their sizing chart. It is also one of the most powerful water heaters on the market.

At the maximum performance, this electric heater delivers 6.6 GPM, at which it supplies sufficient hot water to service up to four showers and one faucet. It also has an electronic temperature display which is easy to read, and you adjust it from there with 1 degree-increment”. It is also a durable option because the heating elements are based on copper immersion.

Pros & Cons

  • Durable
  • Powerful
  • Energy efficient
  • Demanding
  • Pricey

This popular product is a little pricey, but its specifications and high-end performance make it a worth-buying product. It is an all-in-one product with almost all the features one can expect from the best electric tankless water heater.


All of the aforementioned products are well-designed and promise to give high-end performances. There are different heaters based on differences in applications and uses. You have to choose the one which is compatible with you based on your needs. For more convenience, we have mentioned three of our top picks below with reasons what makes them great:

It’s time to upgrade your previous model with any of these super amazing electric tankless heaters, which are high energy efficient and promise to supply endless warm water even in colder regions. Go through this blog and grab yours!

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