Best Electric Tankless Water Heater

Last Updated on September 1, 2020

Are you searching for the best electric tankless water heater?

I have reviewed the most popular models on that market and after reading this article you will know the recommendations.

Check the quick list below for links to customer reviews and prices for my best electric tankless water heater picks, or read on for the full review:

  1.  Bosch Electric Mini-Tank Water Heater Tronic 3000T 7 Gallon
  2.  Sio Green IR260 POU Electric Tankless Water Heater
  3.  EcoSmart ECO 11 Electric Tankless Water Heater
  4.  Bosch Electric Mini-Tank Water Heater 2.5 Gallon
  5.  Rheem RTEX-18 Residential Tankless Water Heater

Tankless water heaters have shown to be a lot more economic and overall more efficient than their traditional counterparts. They save a lot of money in the long run and they’re not as bulky so they don’t require much space for storage and they deliver hot water on demand.

A regular water heater stores and preheats a specific amount of water that ranges from 30 to 50 gallons. It takes a regular gas heater between 30 to 40 minutes to heat up the water and it takes a regular electric heater twice as long to heat up.

tankless water heater uses a power source to heat the water on demand whenever needed. The power source also being electricity or gas.

While both have their strengths and weaknesses, the strengths that a tankless water heater presents are substantially superior to those of a regular water heater.

Electric Tankless Water Heaters

Tankless heaters that are powered by electricity are great for low use households and they require very low maintenance. They’re much cheaper than a natural gas or propane powered tankless heater and are great for on-demand use.

On the flipside, they’re lacking when it comes to heating capacity since their maximum capacity is 4 GPM. Moreover, they might not be a good choice for larger homes or in extremely cold environments. You might also need a costly enhancement of the voltage, amperage, and the circuit breaker if your electrical set up is inadequate.

An electricity based tankless water heater would be an ideal choice if you reside in a warm climate region where the demand for hot water is low.

Natural Gas Tankless Water Heaters

Tankless water heaters powered by natural gas have great heating capacity up to 10.6 GPM. They’re less expensive and also more efficient than electricity or propane based heaters.

Proper ventilation is crucial and an oxygen level correction is needed at high altitudes to ensure the proper burning of the natural gas and to prevent carbon monoxide from being produced.

A natural gas based tankless water heater has great heating and flow capacity so it’s ideal for almost all situations. Also, it can perform really well in cold weather.

Propane Tankless Water Heaters

Tankless water heaters powered by propane have a great heating capacity that can be up to 11 GPM and an overall greater heating ability. They’re also available everywhere.

The downside of propane heaters is that they’re much more expensive than the ones powered by natural gas or electricity. Also, proper ventilation is needed. Oxygen level correction is to take place at high altitudes, which is needed to ensure the proper burning of propane and to prevent carbon monoxide from being produced.

 

A propane based tankless water heater is usually preferred in places that do not have natural gas service. It’s also highly efficient in cold weather.

Best Electric Tankless Water Heaters

Bosch Electric Mini-Tank Water Heater Tronic 3000T 7 Gallon

This water heater can fit anywhere thanks to the optional wall mount feature. Unlike the 4-gallon or 2.5-gallon models that are plugged into standard outlets, this 7-gallon tankless heater requires hardwiring. Temperature ranges from 65 to 145 °F, the water pressure range is 150 psi and the rate of recovery is 7 gallons per hour

The design is heavy so it requires a firm foundation to support it. This mini-tank is capable of functioning separately as a standalone heater or in conjunction with a water heating system as a booster.

The tank is protected against corrosion due to its glass lining, which also grants it high efficiency when it comes maintaining heat. It has a T&P relief valve installed to keep it from exploding in the event of extreme heat variations.

Specifications

  • Dimensions 17.50″ x 17.50″ x 14.50″
  • Weight 29.5 lbs
  • 120 Volt
  • 12 Amp

Pros

  • Sizable tank
  • Corrosion protection
  • Six year warranty
  • Optional wall mount

Cons

  • Requires hardwiring
  • No drain valve

Sio Green IR260 POU Electric Tankless Water Heater

Sio Green is known for being the only company that utilizes infrared quartz heating elements, which they claim to maximize the energy efficiency of a heater. These heating elements do not come into contact with water, which results in a prolonged life for these elements.

While innovative with the infrared technology, this tankless heater has a low-temperature rise, which means it does not possess a lot of power when compared to other tankless heaters with greater temperature rise.

Specifications 

  • Dimensions 14.30″ x 12.80″ x 4.40″
  • Weight 6.75 lbs
  • 220-240 Volts
  • 10-30 Amperes

Pros

  • High efficiency
  • Lightweight
  • Various power levels

Cons

  • Low temp rise

EcoSmart ECO 11 Electric Tankless Water Heater

This tankless water heater is suitable to work in conjunction with an entire home system. It can heat up to 2 gallons per minute with a 1.5 GPM flow. It’s best suited for incoming water temperatures that exceed 67 °F. The temperature control feature allows you to adjust your temperature in increments 1 °F. This model works great in cold climates.

The self-modulating technology allows the heater to detect the temperature and flow of water without any personal effort. However, this feature requires a small delay time of around 30 seconds.

There’s a lifetime warranty on the electronics, the element, and the exchanger, but for this warranty to be honored, the unit must be installed by a licensed professional.

Specifications 

  • Dimensions 11.50″ x 8.00″ x 3.75″
  • Weight 6.5 lbs
  • 240 Volts
  • 57 Amps

Pros

  • Energy efficient 
  • Lifetime warranty
  • Lightweight
  • Consistent in all climates
  • Self modulating technology

Cons

  • Flow delay due to self modulation 
  • Requires pro installation

Bosch Electric Mini-Tank Water Heater 2.5 Gallon

This is basically the smaller and lighter version of the ES8. It can be plugged into a standard outlet. This model works best as a boosting unit because of its small size, but it can also work in conjunction with a larger system. Similar to the ES4 and the ES8 models, the temperature ranges from 65 to 145 °F and the water pressure range is also 150 psi.

The relatively lighter weight of this model allows it to be installed without the need of a supporting foundation. Also, the mounting position is optional. The T&P relief valve is factory installed to keep it from exploding in the event of extreme heat variations.

The tank is protected against corrosion due to its glass lining, which also grants it high efficiency when it comes maintaining heat.

Specifications

  • Dimensions 13.75″ x 13.75″ x 10.75″
  • Weight 15.5 lbs
  • 120 Volts
  • 12 Amps

Pros

  • Corrosion protection
  • Six year warranty
  • Optional wall mount
  • No hard wiring needed

Cons 

  • Non thermostatic unit
  • No drain valve

Rheem RTEX-18 Residential Tankless Water Heater

This is a powerful tankless heater that is designed for residential homes. Providing quick and on-demand continuous water for point of use and multiple applications. It also features self-modulating technology which automatically adjusts the power to the demand for hot water.

The two heating elements within this heater are immersed in copper to ensure their durability. Also, the thermostatic digital control is mounted externally with LED display.

Like all Rheem heaters, this tankless heater does not require a T&P valve. Further, you can expect 5 GPM at a 25 °F temperature rise.

Specifications 

  • Dimensions 4.00″ x 15.00″ x 19.00″
  • Weight 8.5 lbs
  • 240 Volts
  • 75 Amps

Pros

  • Easy to mount
  • Lightweight
  • Compact design
  • Energy efficient
  • 2 heating chambers
  • Durable heating elements

Cons

  • Requires more space than many

All of these tankless water heaters present plenty of good features which makes it extremely hard to pick a clear winner. So here’s a quick categorization to help you pick the one that works best for you.

In terms of power, your best bet is the Rheem RTEX-18 240V 2 Heating Chambers Residential Tankless Water Heater.

In terms of heat efficiency, the Sio Green IR260 POU Electric Tankless Water Heater is the choice for you

In terms of overall practicality and durability, the EcoSmart ECO 11 Electric Tankless Water Heater is the answer.

 

Personally, if I was to pick a tankless water heater for myself, I would go for the EcoSmart 11. The lifetime warranty and the many other positive features that it presents are just extremely tempting. Which one do you think is the best?

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