Cheap Best Tankless Electric Water Heaters 2021 Reviews

A tankless electric water heater is a great purchase if you’re looking to make your home more modern and efficient. No more waiting minutes on end for hot water to start flowing in your sink or shower – with a tankless electric water heater, you can get warmed up right away, whenever you want. Tankless electric water heaters have become very popular recently. Companies have taken notice of this and begun expanding their selections.

Top Best Sellers in Tankless Electric Water Heaters

Table of Contents

10. Atmor AT-D24TP-AZ

The Atmor AT-D24TP-AZ is a tankless electric water heater that offers super fast water heating at a low price. ThermoPro technology provides maximum energy efficiency by regulating water flow and energy usage depending on the temperature of the water. This means big savings on your electric bill, especially if you’re switching from an old tank-style water heater. It is also one of the only tankless electric water heaters to be IP54-certified splash resistant.

The AT-D24TP-AZ is most ideal for small to medium sized homes in warm climates, as it can handle up to four applications at once with an incoming water temperature of 73 degrees Fahrenheit. It may not be the best option for larger homes or colder areas.


  • Affordable price
  • Easy to install
  • IP54 splash resistant
  • Highly efficient in warm climates


  • May not be powerful enough for large homes
  • Not ideal for cold areas

9. iHeat Tankless S-16

iHeat Tankless S-16

The iHeat Tankless S-16 water heater has an extremely small form factor, making it a great option for small spaces such as utility closets. It can heat 3.5 gallons per minute, enough for two showers and one sink in warm climates. Colder climates will be limited to point of use application – that is, one application per heater.

One thing to consider with this water heater is that low-flow fixtures will allow the water to get hotter. Switching your showers and faucets to low-flow fixtures will produce more efficient results.


  • Small and lightweight
  • Durable
  • Great for small homes
  • Works best in warm areas


  • May be inefficient when used with high-flow fixtures
  • Not the best choice for cold climates

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8. Marey ECO 110

Marey ECO 110

The Marey ECO 110 tankless electric water heater has very low energy consumption, using only 12.6 KW. It is also compact and lightweight. The price is quite affordable compared to other water heaters.

The ECO 110 claims to output 3 gallons per minute but many reviewers say that this figure is too high. It is best suited for a very small home, cabin or workshop where only one appliance will be using hot water at a time. Colder climates will probably require a more powerful heater than this.


  • Very affordable
  • Great for low-usage applications
  • Easy to install anywhere in the home


  • May not be powerful enough for full everyday usage

7. Rinnai RL94eN

Rinnai RL94eN

Pricey but powerful, the Rinnai RL94eN tankless electric water heater can output 9.4 gallons per minute, enough to provide hot water to five appliances at once. This whole house water heater is Energy Star certified and has an attractive chrome finish.

The RL94eN is intended to be installed outside the house, so installation may be trickier than for other water heaters. It is also quite large and heavy. However, it can provide hot water to the whole house, including in cold temperatures.


  • High output water heater
  • Energy Star certified
  • Works in any climate


  • Bulky
  • Can be difficult to install

6. Westinghouse 80 Gal. 4500W

Westinghouse 80 Gal. 4500W

This is not a tankless electric water heater but is still a very efficient choice. It has a lifetime warranty and once it heats up for the first time it provides hot water surprisingly fast for a tank-style water heater. The Westinghouse water heater boasts 98% thermal efficiency and a long-lasting stainless steel construction.


  • Lifetime warranty
  • Solid construction
  • Highly efficient


  • Not tankless
  • Very heavy and can be hard to install

5. Stiebel Eltron Tempra 29 Plus

Stiebel Eltron Tempra 29 Plus

This 28.8 KW tankless electric water heater is a very innovative option. Made in Germany, this heater is unique in that it does not require venting. Users report getting around 4.5 gallons per minute from the heater, which is enough for a medium sized home. The Stiebel Eltron’s water flow sensors allow it to constrain energy usage for a lower electric bill.


  • No venting required
  • Enough flow for everyday whole-house use
  • Works in any climate


  • May be too powerful for some homes and require electrical rewiring

4. Eccotemp FVI-12-NG

Eccotemp FVI-12-NG

The FVI-12-NG is a tankless gas water heater that can output up to 4 gallons per minute. Because it heats with natural gas, electricity consumption is very low – only 10 watts while operating. If you do not have a natural gas supply, however, this heater cannot be used. It requires venting as natural gas fumes must be vented outside. The heater is well-built and simple to adjust.


  • Very low electricity use
  • Durable and easy to use


  • Cannot be used without natural gas
  • Installation of venting may be difficult

3. Rheem RTE 9

Rheem RTE 9

The Rheem RTE 9 is ideal for point-of-use application. This tankless electric water heater works best when it provides hot water to only one fixture or appliance. Due to its low power it does not work well in the cold. At its maximum output of 3 gallons per minute it can raise the temperature of the water by 30 degrees Fahrenheit. It is easy to install and set up.


  • Simple installation
  • Ideal for one appliance
  • Best for small warm spaces


  • Larger homes will need more power
  • Underperforms in the cold

2. EcoSmart ECO 27

EcoSmart ECO 27

Using 27 KW and outputting up to 6 gallons per minute, the ECO 27 uses patented self-modulating technology to save power. The tankless electric water heater is large and powerful, best suited for northern homes and low water temperatures. It can output up to 3 gallons per minute with incoming water temperatures of 37 degrees Fahrenheit. Digital temperature control makes it easy to set up.


  • Great for cold climates
  • Patented energy saving technology
  • High output even at low temperatures


  • May require rewiring to install
  • High price

1. Atmor AT-900-03

Atmor AT-900-03

This extremely affordable tankless electric water heater is designed for point-of-use installation. It can output 0.5 gallons per minute, which makes it best used to heat water for a single sink. It works best when incoming water temperatures are over 57 degrees Fahrenheit. It is very small and is able to be installed easily and discreetly under the sink.


  • Ideal for those who only want to heat one sink
  • Budget friendly
  • Easy to install and keep out of sight


  • Will only work for one sink
  • Requires warm incoming water

So there you have it – the 10 best tankless electric water heaters. Hopefully now you can make a more informed buying decision and choose the one that’s right for you and your home.

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