The 6 Electric Tankless Water Heaters Reviews & Guidance

The electric tankless water heater is a kind of heating machine powered mainly by electricity. It is more flexible in installation spots and is able to provide constantly hot water for you. In order to help to better choose tankless electric water heaters, we made a detailed tankless electric water heaters reviews for you.

6 Best Electric Tankless Water Heaters Reviews

how much is a tankless electric water heaterRheem RTEX-13 240V4.8
best tankless water heater electricEcoSmart ECO 27 Electric4.8
cheap tankless water heaterStiebel Eltron Tempra Plus 24 kW4.6
small electric water heaterBosch Tronic 2.5-Gallon4.6
top tankless electric water heatersSio Green SIO14 Electric4.7
list of best tankless water heatersMarey ECO150 220V/240V-14.6kW4.5

Electric Tankless Water Heaters Reviews

1. Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater

best electric tankless water heater
tankless water heater reviews electric





  • 4gpm flow rate

The maximum flow rate of this unit reaches up to 4 gallons per minute, which is quite high among electric tankless water heaters. But as the power is low, it is perfect for single bathroom use only.

  • Easy operating control panel

Led light and digital control panel make it super easy to operate, the temperature shows on the screen and can be adjusted by simple dial settings. Error codes readout for safety using.

  • Short waiting time

It takes about only 15 seconds for hot water to hand sink, less cold water is wasted. Water temperature always stays stable in use, and there is no worry of running out hot water in taking a bath.


  1. Money saver on using and installation
  2. Easy installation, only takes about one hour
  3. Less using cost on electricity bill
  4. The multi-stranded wire makes the connection much easier
  5. Cheap and affordable price
  6. Endless hot water supply
  7. Easy operate
  8. Perfect for studio family


Perfect for one faucet or one bathroom use time only

2. EcoSmart ECO 27 Electric Tankless Water Heater

best tankless water heater electric
best tankless water heaters electric





  • 80-140 degrees F temperature range

Temperature range of the heating machine is between 80 and 140 degrees F, perfectly meet the demand for normal family use. But according to the customers’ reviews, the temperature can not be set as right as EcoSmart promises.

  • 6 GPM flow rate

The flow rate of the heating machine is 6 gallons per minute in warm places, when it is used in cold weather or cold areas, it may drop to 3 gallons per minute. It is able to run two showers simultaneously and can work for whole home in middle or small size family.

  • Easy operating control panel

Temperature is easy to be adjusted one increment so you get the most suitable one for your home and your needs. Self-modulating technology ensures heater draw energy only when using it.


  1. Save about 50% in water heating cost
  2. Copper and stainless steel components
  3. Unit is well made, you can easily replace the heating elements
  4. Saves 12 cubic feet in installation
  5. Endless hot water supply
  6. Work for whole home


Can not produce pipe hot water at a high flow rate

3. Stiebel Eltron Tempra Plus 24 kW Electric Tankless Water Heater

tankless electric water heater reviews
tankless electric water heaters review





  • 5 gallons of water flow

This unit has the power to supply about 5 gallons of water per minute, so it is able to support two bathrooms use at the same time. It is able to raise water by 54 degrees F at 3 gallons per minute.

  • High energy efficient

Energy-efficient reaches as high as 99%, thus seldom water and energy is wasted. It is regarded as the most technologically advanced electric water heater, built-in advanced flow control modules regulate the water pressure automatically.

  • Stable temperature

The advanced flow control system is installed to control constant water temperature in different flow level, which is quite suitable for people in need of occasional hot water, it can also be used for a commercial heater.


  1. Commercial & residential use available both
  2. Self modulating technology to save efficient
  3. High level electronic parts and reliable cover
  4. Quiet working condition
  5. Support full power modulation
  6. Ideal in area where supplied water is under 45 degrees F


Difficult to install, need 240v power and heavy duty wiring

4. Bosch Tronic 2.5-Gallon Electric Mini-Tank Water Heater

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electric tankless water heater ratings





  • Mini tank for point of use

The water flow of this unit is 2.5 gallons per minute, the compact and lightweight size enable you to install right under the sink for point of use. It can supply up to two sinks the same time, but is not suitable for bathrooms use.

  • Fast water flow

As it is installed point of use, the distance between tap and heater is extremely short, thus largely reduced the waiting time for hot water, less cold water is wasted and water bills can be reduced to a large extent.

  • Simple use

It is easy to operate, you can just plug it into the outlet and no complicated machinery is required. Installation is super easy, takes about one hour and can be wall hung or floor mounted.


  1. Fast recovery on hot water
  2. Easy installation and use
  3. Compact design
  4. Can be wall hung or floor mounted
  5. Easy to maintain and has a glass-lined tank for long service life
  6. Endless hot water


  1. not suitable for large home use
  2. Lack of consistency of water temperature

5. Sio Green SIO14 Electric Tankless Water Heater

top tankless electric water heaters
top electric tankless water heater





  • 3 GPM water flow

The flow rate of this tankless water heater is quite low, around 3 gallons per minute in minimum temperature, in cold regions, it is able to support one sink but not a shower. But in warm regions, it is capable of supporting one bathroom and one sink the same time.

  • No corrosion

It is made with patented technology, so it creates heat without direct contact with metals. It is the best point of use electric tankless water heater used for a tiny home or small homes. Endless hot water supplies and there is no worrying of running out of hot water.

  • Compact shape

It weights light, only 26.9 pounds. You can use it anywhere you want because of its small compact shape. It uses 110 volts or 220 volt and advanced technology enables it to heat water only when need it.


  1. Endless hot water supply
  2. Automatic power technology equipped
  3. Easy installation
  4. Can be used widely for RV, sink, and storage, etc.
  5. Little maintenance required
  6. No corrosion


Temperature shows on degree C but not degree F

6. Marey ECO150 220V/240V-14.6kW Tankless Water Heater

top rated electric tankless water heaters
top rated tankless water heaters electric





  • Little water pressure required

This unit needs small water pressure and can provide constant hot water. It requires 220v-240v and 70 amp double pole breaker.

  • Easy operation

Smart technology is equipped inside the machine, easy and simple adjustment of LCD panel enables you to get demanded hot water temperature, less energy is wasted in whole process.

  • No standby loss

The heating machine heats water only when you need it, thus eliminates the standby energy consumption of conventional tank units.


  1. Smart technology
  2. Suitable for small tiny home use or point of use
  3. Energy efficient
  4. Less electricity power required
  5. No standby loss


Must be installed by plumber or electrician

What Is Electric Tankless Water Heater?

Electric tankless water heater is a popular and widely used heating machine, electricity is served as main power source. Compared with gas tankless water heater, it avoids the trouble of getting ventilation facilities, for no direct carbon dioxide is emitted.

Electric Tankless Water Heater Pros And Cons


1. Support constantly hot water

One feature of electric tankless hot water heater is that it is able to support endless hot water for you. Unlike tank water heater, no water is stored in the tank. So you do not need to worry about running out of hot water any longer.

2. Energy efficient

All the electric tankless hot water heater starts working only when you use hot water, thus it is able to save 60% energy cost compared with tank water heater.

3. Environmental friendly

The heating time and using time is quite short, so there are less electricity used in whole working process, thus it proves to be eco-friendly type.

4. Easy installation

As it is powered by electricity, there is no need to install venting kits, so you can install it anywhere you want. It is able to be installed either indoor and outdoor based on your needs.

5. Space Saver

The tankless water heater is designed compact and light-weighted because it has no tank, it occupies an only small piece of land of yours. Even for a small tiny home, electric tankless hot water can still be installed and used.


Low water flow

Electric tankless water heater is normally not as powerful as natural gas tankless water heater, for most of times, several electric type equals to one gas type. The average flow rate of it is around 2.5 gallons per minute, able to meet the demand of one bathroom use only. Therefore, most of the electric tankless water heaters are used point of use.

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most efficient electric tankless water heater

How to Buy the Best Electric Tankless Water Heater?

Top electric tankless water heaters are able to save a large number of user costs for you, and they are more energy-efficient. Price is the primary thing that you should and would consider most, but there are also many other factors need to be taken into consideration.

1. Size

Tankless water heaters do not need a tank for preheating, that you do not need to worry about the capacity. You should estimate the average water amount your home need per day, and choose the suitable one based on it.

2. Flow rate

The flow rate of electric tankless hot water heater represents the power of the heating machine, and also gallons of water it provides per minute, known as GPM. Besides, you should also pay attention to the British Thermal Units (BTU), normally the higher BTU is, the larger flow rate is.

3. Energy efficiency

High energy-efficient tankless electric water heater saves about 60% energy costs for you each month, and heating bills will be saved to a large extent accordingly. The normal thermal efficiency of an electric tankless water heater is 78-85%.

4. Location

You should choose best electric tankless water heater based on your home location, if you live somewhere cold, then you need to get large water flow type, for the temperature and flow rate will frequently drop 2-3 GPM when in cold areas.

5. Smart functions

Many smart functions such as self-diagnostic and overheat sensor etc help to turn off the machine automatically in dangerous situations. For outdoor installation, there should also be freeze protection, especially in cold areas.

Electric Tankless Water Heater Cost

Electric tankless water heater costs include two aspects, one is the price of the heating machine, while the other is using costs.

1. Electric tankless water heater prices

Compared with gas or propane tankless water heater, the electric type is much cheaper, because most of which are the point of use design, power and flow rate are not so large. Therefore if you are short of budget, you may consider buying an electric tankless water heater. Most of them are under $1000.

2. Using costs

It is actually the key factor you should think in selecting. The upfront price of the electric tankless water heater is quite cheaper, but the installation costs, maintenance costs as well as heating costs are higher than gas tankless water heaters.

Electric heaters need to be installed by professionals if you lack the knowledge, and it needs regular maintenance. Thus the whole using costs are relatively high.

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tankless electric hot water heaters reviews

Top 3 Best Electric Tankless Water Heaters

Types of Electric Tankless Water Heaters

1. Whole house tankless water heaters

In daily life, you may need hot water in both bathrooms for taking a bath and in the kitchen for dishes washing. In such a situation, you need to get a whole house tankless water heater, only one heating machine meets all your demand for hot water for the whole house. But of course the different size of home suits different whole house heaters. For a large family with three or four bathrooms, you need to get a large flow type. And a small one is perfect for a tiny home with one bathroom only.

2. Portable electric tankless water heaters

Portable tankless water heaters weight light and have a small flow rate, they can be carried and installed anywhere. They are perfect for camping and traveling. You can also use it on RV (recreational vehicle). we have made detailed reviews on portable electric tankless water heaters, you can check it for more information if you have an interest.

3. Outdoor electric tankless water heaters

Outdoor tankless water heaters are installed outdoor, on the outside wall of the bathroom. They are mostly installed with freeze protection system, helps to produce machine from being frozen by bad weathers. Some are also equipped with an enclosure such as rain cap, to prolong service life outdoor electric tankless water heater as much as possible.

Electric vs Gas Tankless Water Heater

1. Energy efficient

Electric tankless water heaters and gas tankless water heaters on the market now are normally designed into energy efficient types, but gas tankless water heaters are 3 times more efficient than the electric type.

2. Price

Purchasing price of electric tankless water heater is far cheaper than gas type, it is perfect for small budget family use. But for long terms of use, using costs of gas tankless water heater is relatively cheaper. So basically the whole costs of two types of heaters are the same, one takes much upfront, while the other needs more money on maintenance and heating bills in later use.

3. Installation

The electric tankless water heater is more flexibility in installation, it is not subjected to the pipe line or ventilation system. Thus you can install it anywhere you want. But as for gas tankless water heater, you need to consider ventilation.

4. Power and flow rate

The electric tankless hot water heater is less powerful, and the average flow rate is only around 3 gallons per minute, while the gas tankless water heater is more powerful, it is able to support multiple bathrooms and faucets the same time. Some of the gas heaters reach as large as 9 gallons per minute.

5. Environmental friendly

The gas tankless water heater uses natural gas or propane as a major power, they are both clean sources and do little harm to the environment, but also carbon dioxide is emitted in using period. On the other hand, the electric tankless water heater does not directly emit CO2 but still has a bad influence on the environment if used for a long time.

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top rated electric tankless hot water heater

Electric Tankless Water heater Problems

1. Expensive

The purchasing price of electric tankless water heater is not so high, some even take no more than $500, but for some situations, you need to change the wiring system of your home and it takes a large amount of money, not to say the professional installation. Using costs of electric tankless water heater is also not a small deal, though equipped with the high energy-efficient system, the heating costs and water bills are still higher than gas or propane type.

2. Not effective in cold areas

When it is used in cold areas, you may find it not so cost-effective. The temperature and flow rate will drop in cold weathers, the original flow rate of it is quite low, so it may not able to support whole house use there.

Electric Tankless Water Heater Installation

Electric tankless water heater installation is not an easy task, working performance of heater is to a large extent closely related to its installation, if operates wrong, it may leak out or gets broken easily. So followings are the tips in the installation:

1. Most of the electric tankless water heaters are indoor installation only, it can be installed outdoor if allowed by manufacturers. But make sure there is enclosure outside the machine for outdoor installation or constantly severe weathers such as rain and wind will do permanent harm to the heating machine and shorten the service life of it.

2. For indoor installation, it is better to be installed near application fixture or main power panel. The distance between heater and tap determines to wait time for hot water, and longer waiting time represents higher water bills. Thus if you install it near the point of use, you can use hot water in a few seconds and less cold water is wasted. Besides, when you intend to install it far from the power panel, it means you need to get more tubes on the connection.

3. If an electric tankless water heater is installed in the bathroom, make sure there is a safe distance between machine and shower head, make sure it keeps dry and do not get water on it. And better to install it where is ventilating and far from moist areas.

4. The electric tankless hot water heater should be installed somewhere that is accessible. Make sure you are able to reach and operate easily.

5. Always follow the instructions and use the heating machine safely, do not cover anything on the heaters.

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electric tankless water heater installation


1. Can electric tankless water heater be installed outdoor?

Some of them can be installed outdoor if marked on installation instructions. But make sure that there are enclosure devices outside to protect the machine.

2. Are electric tankless water heaters worth it?

Electric tankless water heaters are energy efficient and have long using life, they last about 20 years with little maintenance. Therefore, if you do not have enough money or do not have a pipeline at home, you can choose electric tankless water heaters. The high quality and high energy efficient electric tankless water heaters are totally worth the price.

3. How good are electric tankless water heaters?

Electric tankless water heaters weight light, they can be highly energy-efficient and space saver. You can install it anywhere you want and it saves money in buying and installing a ventilation system.
For the heating machine or other household appliances, there is no best one but the best suitable one, only the machine fits your needs most can be regarded as best. So you should consider the actual needs of yours and choose the most suitable one.

4. Does electric tankless water heater need ventilation?

No, only propane or gas tankless water heaters need ventilation.

5. Are electric tankless water heaters money saver?

Of course, they are, electric tankless water heaters are able to save 60% energy and 30% money cost at home per month.

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All the recommended best electric tankless water heaters above are of different types, some can be used for a large family, some may be used only for a point of use, while there are still some equipped with high technology. On selecting and buying a top-rated electric tankless water heater, you need to think more about your actual needs and budget.

To sum up, we selected three best electric tankless water heaters for you as follow:

Best TypeTankless Water Heater
Best selling typeRheem RTEX-13 240V Tankless Water Heater
Best one for middle or tiny home useEcoSmart ECO 27 Electric Tankless Water Heater
The most technologically advanced typeStiebel Eltron Tempra Plus 24 Tankless Water Heater

If you have any interest in any of the item and would like to get more information, please feel free to check out on Amazon, there will always be a large discount on the product and will save a large sum of money for you.