Best Electric Tankless Water Heater Reviews 2022

Last Updated on 2 years by Todd

tankless water heater reviewsDo you face compromised hot water supply during early morning showers in chilling cold weather? If yes, then it’s time to replace your old tank-type water heater with a new electric tankless water heater.

Tankless water heaters are the trend of the new generation who looks for instant and energy-efficient solutions. They are known to reduce your electricity bill as compared to storage type electric water heaters.

For your information, an electric tankless water heater saves up to $100 annually.

And that is true! Since tankless water heater will heat the water only when the water runs through its heating elements and pipe. Thereby, saving extra energy that is wasted in conventional water heaters to keep the water warm.

Not only this, there are many other benefits of the tankless water heater.

Best Electric Tankless Water Heater 2022:

Many brands are manufacturing on-demand water heaters, but not all brands all trustworthy. So, just because of this, we have compiled a list of some of the best electric on-demand water heaters of the reliable and top-notch manufacturer.

Besides this, you will get to know all relevant information about tankless water heaters along with its buying guide.

So without further ado, let’s gets started to know what is the best electric tankless water heater?


What Is Tankless Water Heater?

A tankless water heater is also known as an instantaneous water heater or on-demand water heater. They provide hot water right at the moment when you need it. Tankless water heater does not have any storage tank for storing hot water, and instead, they use heating elements to heat the water as you need it. Typically on-demand water heater provides hot water with a flow rate of 2-5 gallons per minute.

Tankless electric water can be installed either in a closet or on an exterior wall or any convenient place inside your home. They are super-efficient to heat your whole home or a single point of use, such as a shower sink or appliance.

Initial purchase and setup of a tankless water heater are quite expensive but trust me. It’s a one-time investment. You won’t need any water heater for more than 20 years.

Advantages of Tankless Water Heater:

  • Demand water heaters can be 24%–34% more energy-efficient than conventional storage-tank water heaters, for families that use 41 gallons or less of hot water daily.
  • Tankless water heaters have low operating and energy cost.
  • Such heaters have a life expectancy of more than 20 years.
  • Tankless water heater avoid the standby heat losses that are associated with storage tanks.
  • A tankless water heater offers endless hot water supply.
  • They reduce utility bills.
  • Tankless water heaters require less storage space than storage tank water heaters.

Best Whole House Electric Tankless Water Heater Reviews:

1. EcoSmart ECO 27 – Best Electric Tankless Water Heater

Best Electric Tankless Water Heater Reviews

When it comes to the best electric tankless water heater, EcoSmart is the name that strikes the mind first.

EcoSmart is a renowned name because of the company’s environmental focus and budget-friendly prices.

ECO 27 features a unique self-modulating technology that increases its efficiency by saving electricity. Just because of this technology, EcoSmart claims to 50% of water heating cost.

I have two units for water. One is for hot water. The other is to heat the whole house with hot water. I had a hard time finding information about these units online, so I will tell you what information I found.

The 9KW heater is rated at 27 kW at 240 volts. It has three separate 9KW heaters that are in series and in sequence based on demand internally. The device is self-modulating, so it will not generate more heat than the load requires.

Each internal component requires its own dedicated 240 volt 40 amp circuit, for a total of three distinct #8 wire 240 volt circuits. I hope that’s clear enough.

Overall, I give this product 5 stars. Price, dependability, and technical support are all outstanding. When professionally installed, the unit comes with a lifetime guarantee. Cleaning and maintenance are easy since it uses a Phillips screwdriver rather than a pipe wrench or fiberglass insulation to remove obstructions. Nobody was the wiser that I’d carried it inside under one arm and installed it until days later!

You will be amazed to know that you will get hot water only when you will need it. Thanks to its on-demand water heating system.

It features 3 heating elements of 9kW each, which makes a total of 27kW.

As far as the flow rate is concerned, ECO 27 delivers 3 GPM of water. It means 2 showers can be operated simultaneously using ECO 27 whole house electric tankless water heater.

Eco 27 features a smart digital temperature control in 1-degree increments that allow control of hot water.

This compact and efficient unit is designed to save not only your bill but also your space. It can be mounted easily on any wall./ now you don’t have to worry about space as in the case of an electric tank heater.

The worth mentioning point about ECO 27 electric tankless water heater is UL and CSA certified water heater.

ECO 27 promises to give an endless supply of hot water. You only have to choose a proper unit for your home, keeping in mind your desired capacity.

  • Space-saving design
  • Saves money and energy
  • Highly efficient
  • Endless supply of hot water
  • Hot water takes 15 seconds to come to the faucet.



2. Rheem 240V – Best Residential Tankless Water Heater

If you search for the cheapest and smallest tankless water heater, then 

Rheem 240V - Best Residential Tankless Water Heater

Rheem TREX 13 electric tankless water heater can quench your thirst.

This compact and small-sized water heater is highly durable, as its heating elements are made up of high-quality copper. 

Rheem RTEX promises to supply you with hot water on demand. Now you don’t have to pre-heat tubs of hot water before taking a bath. Just open the faucet, the water flow will turn on the copper immersion heating elements, which provide the constant hot water stream.

In a 3-Season cottage in the midwest, it was installed last month. There is only one shower, one toilet, and one bathroom sink. It comes from a private well and has a temperature of 45 to 55 degrees when it enters the house. Moen Shower Faucet 1.5 GPM Flow Rate I’ve got the water heater’s temperature set to 110 degrees so you can bathe for as long as you like with no fluctuation in temperature.

Yes, I observed that if the bath sink is turned on, there will be some fluctuation in temperature, and lowering the water volume on the faucet will eliminate it. There’s no issue with a mix of hot and cold hand washing temperature, which is steady, even, and pleasant.

I installed the unit with a shut-off valve on both ends, and I haven’t yet taken the time to play with the output valve on the heater to restrict flow out to eliminate the all-hot problem, but based on what I’ve read, adding that little restriction on that end should solve it.

As far as the flow rate is concerned, it provides hot water at the rate of 3.17 GPM, which means hot water can be supplied to two bathrooms at a time.

The Rheem RTEX 13 electric tankless water heater has 99.8% energy efficiency. 

Some people have saved up to 30% on their electricity bills using RTEX electric tankless water heater.

Besides this, it has an external digital control that is quite a user friendly that even a child can easily set the temperature. It has single dial control with the help of which you can adjust the temperature of the water. The model allows increments of 1◦F. This allows precise temperature settings between 80F- 140F.

Unlike gas heaters, you won’t have to look for appropriate space for it. They require very little space, and interestingly Rheem RTEX is a wall-mounted tankless water heater.

When it comes to its installation, it is relatively easy. You have to follow the instruction in its user manual. You can even do it by yourself, but it’s good to consult a professional plumber for its installation.

It will not be a wrong statement if Rheem, RTEX 13 is the best electric on-demand water heater.

  • With a user-friendly digital interface
  • Lightweight wall-mounted tankless water heater
  • High flow rate
  • Robust copper immersion
  • Suitable for small families only.



3. Stiebel Eltron – Best whole House Electric Tankless Water Heaters

Stiebel Eltron - Best whole house electric tankless water heaters

Stiebel Eltron Tempra is one of the best whole house electric tankless water heaters. Stiebel Eltron has been serving the water heater market for over 90 years, and it is the pioneer in the tankless water heater.

Tempra ® features a German patented advanced flow control module, which ensures hot matter at every time. Suppose ever Tempra ® feels that the demand for hot water is greater than its efficiency. In that case, this advanced flow control technology automatically reduces the flow of water, but whatever amount of water it will deliver will be of your desired hot temperature.

This 30 amp transfer switch was installed 10 years ago and failed over the weekend. I must say that this is an easy decision. For the price of about 800 dollars, I received ten years’ worth of service. Yes, I did get the same manufacturer hoping for another ten years.

You will never be surprised with cold water with Tempra ®.

Besides this, it also features Self –modulation energy technology, which ensures the least amount of energy being used by the Tempra ®

Tempra ® promises to deliver steady and constant temperature output. This is possible because of its smart microprocessor technology and temperature and flow sensor. All these are greatly helpful in maintaining a steady output temperature, even if flow rates vary up or down.

In addition to all these features, you will get a direct and unlimited supply of hot water whenever you demand it. So no matter how many people are in shower row, they will get hot water for sure.

Tempra ® features a sleek design that frees up several square feet of floor space and requires less raw material in its manufacturing when it comes to space-saving.

This compact and space-saving unit is quite simple to install. Besides this, it has a low maintenance cost so that it wouldn’t be heavy on your pocket at all.

  • Seismic proof construction
  • High efficiency of about 99%
  • Ideal for large families
  • With advanced flow control feature
  • It has low GPM as compare to other units of the same category.



4. Bosch – Best electric tankless water heater for cold climates

Bosch - Best electric tankless water heater for cold climates

Bosch WH27 is one of the best electric tankless water heaters.

It features a rugged and robust material with a compact design. And has an awesome solid heating capacity that can replace a 40 gallon of tank heater.

I had to confess that the simple installation rating was a little deceptive. I was replacing an earlier model from ten years ago. The unit has never been flushed or had a filter attached to it. This time, I used a tankless valve kit to install a tankless water heater. This allows me to flush the unit without having to unplug the hoses. I also added a pre filter to help keep scale at bay. According on tankless water heater reviews, this device should last up to 20 years.

As a replacement, it’s easy to install. You must make sure that the breaker box has enough electricity and then connect three separate 8 gauge wires to the tankless water heater during the installation process.

Bosch WH27 is built to last and all thanks to its solid copper heat exchangers and brass fittings.

With the help of a thermal cut-out switch, it provides an excellent safety measure and ensures that heating elements will not need any replacement. That’s the reason it has got an average life expectancy of more than 20 years.

Bosch Tronic WH27 is equipped with an electronic flow sensor and element modulation. This way, it gives a consistent output temperature.

Not only this, new scale prevention technology let you monitor temperature stability and control.

This 26.9kW whole house tankless water heater is efficient enough to provide steamy hot water whenever you need it. I assure you, you won’t be run out of hot water when you have Bosch WH27 in your home. It’s copper heating elements gives you instant hot water whenever you turn on any faucet.

As far as its efficiency is concerned, it offers 97% of thermal efficiency. The unit will give you 2.4 GPM output at 75°F, 3.0 GPM output at 60°F, and 3.5 outputs at 45°F temperature rise. This way, it allows you to run 1- 3 major applications at a time. With the help of its external temperature control knob, you have the freedom to adjust your desired hot temperature.

Like all tankless heaters, Bosch WH27 is so space-saving, which is very easy to install. Its simple and elegant design makes it quite attractive when it’s mounted on the wall. 

Bosch is known for manufacturing high end and quality products, like all products of Bosch, this tankless water heater won’t disappoint you at all.

  • Scale prevention technology
  • Built-in flow sensor
  • Lightweight 
  • Compact and space-saving design
  • You may experience a 30-second delay in hot water flow.


Things to Consider before Choose the Best Electric Tankless Water Heater?

Here, you are well aware of some best of the best electric water tankless heater. But still, the problem remains the same, which one is best for your home?

So to solve this problem, we have compiled a brief and concise buying guide about the electric tankless water heater. By following this guideline you can easily decide and choose the best one for your home.

Are Tankless Water Heater Worth It?

Let’s get started!

There are two crucial factors that you need to consider before purchasing a tankless water heater’ that are:

  • The flow rate
  • The temperature rise

The Flow Rate:

Flow rate means the rate at which the hot water flows through the fixture or appliance.

So before buying a hot water heater, first determine your hot water needs. You can do this by listing down the total number of appliances or fixture you will be using simultaneously such as using the kitchen sink, doing laundry, or taking shower at the same time. Then add up each flow rate in order to determine the total flow rate.

Such as the average GPM usage for kitchen sink, washing machine, and bathroom is 2.5, 1.0, and 2.5GPM respectively.

So the total flow rate for peak usage time is 6.0 GPM. This means you need to buy a tankless water heater that must have a flow rate of greater than or equal to 6GPM.

The Temperature Rise:

Temperature rise is actually the difference between groundwater temperature and the desired hot water output temperature.

Let me add to your information that groundwater temperature varies throughout the world. Even a single country would have different ground temperatures in different cities. It can range from the mid s30s to the upper 70s measured in Fahrenheit.

Usually, the internal home water temperature ranges from 110 degrees to 120 degrees. If you want to determine the temperature rise, all you have to do is to subtract the incoming water temperature from the desired internal water temperature. For instance, 55 degrees is the incoming water temperature whereas your desired hot water temperature is 120 degrees, so the temperature rise would be 65 degrees.

Luckily all the tankless heater manufacturers have charts that you can use to help you find the best one for yourself based on temperature rise.

A quick tip:

If you are residing in a cold climate, we would prefer to buy a more powerful heater with a high-temperature rise. This way your heater will need to work full blast to heat your low inlet water temperature.


Are electric tankless water heaters any good?

Tankless water heaters are the best option for those households that uses less than 41 gallons of water per day. For such households, tankless water heaters reduce energy consumption. Though they are quite expensive but they save thousands of your precious dollars that you spend on utility bills.

Can a tankless water heater work for the whole house?

Yes, there are different sizes of tankless water heater available in water that serves hot water to the whole house. Usually for the whole house gas operated tankless water heaters are best.

Where should a tankless water heater be installed?

It is advisable to install a tankless water heater at a place where there is no direct sunlight. They are small and unnoticeable devices that can be installed easily at any place like under the sink or stairs. But it is good to install the unit close to the faucets or appliances it will supply. This will reduce the amount of heat lost during traveling through the pipeline.


Electric on-demand water heaters are ideal for those families who looks for energy-efficient water heating solutions. Tankless water heaters are quite expensive but you can take long-lasting benefits from them. Not only you, but even your generation would take advantage of it. So choosing the top electric tankless water heater is a quite sensitive decision as it’s a one-time decision. Do it wisely!

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