5+ Best Electric Tankless Water Heater Reviews and Guide ( 2020 )

The Electric Tankless Water Heaters, as the name suggests, are mainly powered by Electricity. These Tankless Water Heaters can supply constant hot water to the users and are more flexible in fitting places. We have provided a detailed list of the Best Electric Water Heaters so that you can select the best and most suitable one that can easily fulfill all your hot water requirements.

The Best Electric Tankless Water Heaters Reviews:

The following are some of the best electric water heaters available in the market; choose the one that can really fulfill all your water heater requirements every day.

5+ Best Electric Tankless Water Heaters 2020

Electric Tankless Water Heater
Rheem RTEX-13 240V Residential Heating Tankless Water Heaters 2019
Rheem RTEX-13 240V4 x 9 x 13 inches4 poundsCHECK ON AMAZON
Electric Tankless Water Heater
Best EcoSmart ECO 27 Electric Tankless Heater Reviews 2019
EcoSmart ECO 273.6 x 17 x 17 inches11 poundsCHECK ON AMAZON
Electric Tankless Water Heater
Best Stiebel Eltron 24 kW Tempra Plus Electric Water Heater tankless 2019
Stiebel Eltron 24 kW Tempra Plus21.7 x 20.1 x 9.6 inches16.1 poundsCHECK ON AMAZON
Electric Tankless Water Heater
Best Bosch Tronic Electric 2.5-Gallon Mini-Tank Water Heater Review 2019
Bosch Tronic Electric 2.5-Gallon13.8 x 10.8 x 13.8 inches15.5 poundsCHECK ON AMAZON
Electric Tankless Water Heater
Best Sio Green SIO14 Electric Water tankless Heater 2019
Sio Green SIO1425.1 x 17.2 x 9.5 inches28.3 poundsCHECK ON AMAZON
Electric Tankless Water Heater
Best Marey ECO150 14.6kW 220V240V Tankless Water Heater Reviews 2019
Marey ECO150 14.6kW 220V/240V8.7 x 3.5 x 14.2 inches10.1 poundsCHECK ON AMAZON

Top Tankless Electric Water Heater Step By Step Reviews 2020

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

Rheem RTEX-13 240V Residential Electric Tankless Water Heater Reviews 2019


  • Simple Operating Control Panel:

This tankless water heater has a digital control panel and LED light which makes it very simple to operate. The exact water temp can also be seen on the screen this unit has. You can make use of the simple dial settings for adjusting the temperature according to your need. Error codes readout for safety usage is also available.

  • Four Gallons Per Minute:

This tankless heating device can reach up to four GPM of the max rate of flow. It is quite high as compared to the other tankless devices available. This water heater is ideal for single bathroom usage as its power is low.

  • Less Waiting Time:

If you are using this particular water unit, then you get your hot water n about fifteen secs which means that less cold water is wasted during the heating process. Also, the temperature of the water also stays stable. If you like taking long showers, then don’t worry as this tankless unit will provide you endless hot water.


  • Installation is very simple just takes about one hour
  • Cash saver on installation and utilizing
  • The multi-stranded cable makes the connection much simpler
  • Less utilizing charge on the electricity bill
  • Endless hot water supply
  • Affordable cost and cheap
  • Ideal for the studio family
  • Simple operate


  • Ideal for one bathroom or one faucet usage time only
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  • Six Gallons Per Minute:

If you live in a warmer area, then you will get to enjoy the rate of flow of six GPM . But if you live in a colder region, then this rate of flow may go down to three GPM. You can make use of 2 showers at the same time, and this device can also work for the entire household in small or middle size family.

  • 80-140 Degrees Fahrenheit Temp range:

The temp rate of this heating device is between eighty and one hundred and forty degrees Fahrenheit. This device can ideally fulfill the need of hot water for the normal family. But according to the review of customers, you can’t set the temp as right as the EcoSmart promises.

  • Simple Operating Control Panel:

You ca n also adjust the water temp as per your requirement by one increment. This device also comes with the self-modulating technology, which makes sure that the heater uses energy just when it is in use.


  • Stainless steel and copper components
  • Save about fifty percent bills
  • Saves twelve cubic feet in fitting
  • The device is very well-made, you can replace its heating elements
  • Work for the whole house
  • Endless hot water supply


  • Can’t supply pipe hot water at the high rate
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3. Stiebel Eltron 24 kW Tempra Plus Tankless Water System:

Best Stiebel Eltron 24 kW Tempra Plus Water Electric Heaters 2019


  • Highly Energy Efficient: 

The energy efficiency that this device provides can reach up to ninety-nine percent, thus seldom energy and water is wasted. This one is regarded as one of the most technologically advanced electric tankless heating unit. For automatically regulating the temperature of the water this unit has the incorporated advanced flow control modules.

  • Five GPM Water Flow:

This tankless device can really provide you five GPM of water. You can use two bathrooms at the same time when using this model. This unit can also raise the water by fifty-four degrees Fahrenheit at three GPM.

  • Stable Temperature:

For controlling the constant temp of the water in the diverse water flow levels, it has an advanced flow control system. It makes this model an excellent option for those who only require hot water occasionally. You can also use this electric  heating system for the commercial areas.


  • Self-modulating technology for saving efficient
  • Both residential and commercial usage accessible
  • Quiet functioning condition
  • High-level electronic parts and dependable cover
  • Perfect for the places where supplied water is under forty-five degrees Fahrenheit
  • Can support full power modulation


  • Hard to fit, require heavy-duty wiring and 240v power
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  • Water Flow Is Fast:

This water device is installed as a point of use system which means the distance between the device and the faucet will be short. It makes the waiting time much short and also less cold water is being wasted during the heating process. It all ultimately means that the water bill will be cut down to a great extent.

  • Mini-Tank For POS:

This heating system provides 2.5 GPM of hot water. You can also install this unit under your sink as a point of use system because of its lightweight and compact design. This heating unit can be used for supplying hot water to two sinks at the same time. It is not suitable for bathrooms usage.

  • Simple Use:

This unit is also very simple to operate. You don’t need to have any complicated machinery for operating it simply plug it into an outlet, and you are good to go. Installation process is also very simple and will take about an hour. You can hang it on the wall or simply mount in on the floor.


  • Simple use and installation
  • Quick recovery on the hot water
  • Can be floor mounted or wall hung
  • Compact design
  • Nonstop hot water
  • Simple to maintain and has a glass-lined tank for the long service


  • Lack of water temp consistency
  • Not right for the large house usage
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5. Tankless Water Heater Sio Green SIO14:

Best Sio Green SIO14 Tankless Heater 2019


  • No Corrosion:

This device is created with the patented technology, which makes it unable to get in direct contact with the metals when it creates heat. You can make use of this heating system for the small or tiny houses. It supplies endless hot water, and when taking long showers, you will not have to worry about running out of hot water.

  • Three Gallons Per Minute :

This water heart comes with a quite low flow rate which is about three GPM in the minimum temp. If you live in a colder region, then you will be a little disappointed as it only can supply hot water to one sink but not a shower. But if you are going to use this system in the warmer region, then it is able to support one sink one bathroom at the same time.

  • Compact Design:

It is a lightweight unit and weighs about 26.9 pounds. Because it has a compact shape, it is easy for you to make use of this device anywhere you want. It makes use of 110 volts or 220 volts and the advanced technology allows it to heat the water just when you require it.


  • Automatic power technology
  • Endless supply supply of hot water
  • Can be utilized widely for the sink, RV, and storage, etc.
  • Very simple installation
  • No corrosion
  • Little maintenance needed


  • Temp shows on degree Celsius but not degree Fahrenheit
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6. Marey ECO150 14.6kW 220V/240V Tankless Water Heater:

Best Marey ECO150 14.6kW 220V240V Tankless Water Heater Reviews 2019


  • Simple Operation:

It comes with the smart technology, simple and easy adjustment of LCD panel allows you to get the required temp of the water, and less energy is wasted in the entire water heating process.

  • Little Water Pressure Needed:

This device requires small water pressure and can supply constant hot water. It needs 220v to 240v and seventy AMP double pole breaker.

  • No Standby Loss:

The heating machine can heat your water just when you require it, thus can eradicate the standby energy use of the conventional tank devices.


  • Appropriate for the tiny house use or point of use
  • Smart technology
  • Less electricity power needed
  • Energy efficient
  • No loss on standby


  • Have to be installed by an electrician or a plumber
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What’s The Electric Tankless Water Heater?

The electric tankless heaters are the most popular and broadly utilized systems for hot water. These devices make use of electricity as the main power source. Compared with the gas tankless heaters, these systems evade the trouble of having ventilation systems installed, for no direct carbon dioxide is released in the air.

What’s The Electric Tankless Water Heater

Advantages And Disadvantages Of The Electric Tankless Water Heater:

The following are a few of the best benefits and disadvantages of having the electric tankless heating units installed in your house:


Let’s have a glance at the advantages that these heating devices have to offer:

  1. Energy Efficient:

These systems only work when you require hot water. This feature makes the electric water machines save sixty percent on energy costs as compared to the tank-type ones.

  1. Constant Hot Water Support:

One thing that is great about the tankless electric water heating units is that they supply endless hot water whenever you need. Unlike the tank-type devices, no water is stored in any kind of tank. So you don’t have to be anxious about running out of hot water.

  1. Easy Installation:

When you are going to install an electricity-powered tankless heating unit in your house, you will not need to install any ventilation system. This feature makes it possible for you to install this system anywhere you want in your home. You can also choose to install your system either indoor or outdoor according to your requirements.

  1. Eco-Friendly:

The heating and using time of this unit is quite short, which makes it possible for the device to make use of less electricity while heating up your water. Thus it proves to be an environmentally friendly type.

  1. Space Saver:

Because these machines does not have any tank, these are designed lightweight and compact. A tankless heater will occupy very little space in your house. Even if you live in a tiny or small house, you can still think about installing an electric  water heater in your house.


The following are a few disadvantages of the Tankless heaters:

  1. Low Water Flow:

It is usually not as powerful as the natural gas water heater, for most of the times, numerous electric type equals to one gas-powered device. the water heater has average of 2.5 gpm flow rate of water, capable of meeting the demand of one bathroom usage only. Therefore, the majority of the electric tankless  units are utilized point of use.

How Can You Purchase The Best Electric Tankless Water Heater?

The top electric tankless water heaters are capable of saving a huge number of using costs for you, and they’re more energy-efficient. The cost is the main thing that you ought to and would contemplate the most, but there’re also a lot of other things as well that have to be taken into contemplation.

How Can You Purchase The Best Water HeaterWhen you decide on buying an tankless water heater for your house, you should consider the following factors to get the best one out of all the options available that can really meet your requirements:

  1. The Flow Rate:

A tankless machine’s water flow shows the power of your heating device and also GPM or gallons of hot water it supplies per minute. Besides, the other thing that you have to take into consideration is the BTU (British Thermal Units). Normally, if you have higher BTU, you will have a higher rate of flow.

  1. The Size:

Tankless heaters are those that do not require any tank for preheating, that you don’t have to be anxious about the capacity of the device. But you ought to estimate the average amount of water your house require every day and then select the most suitable one based on that information.

  1. Location:

When thinking of buying an electric tankless water eating device for your house, you should also consider the location of the house. If you live in a colder region, then you should definitely go for the one that has a large flow rate.

  1. Energy Efficiency:

You should also consider the energy efficiency of the unit you really want to get. This heating machines with higher energy efficiency can save about sixty percent on your energy bills every month. And the heating costs will also be saved to a great extent accordingly. The normal tankless heating unit’s thermal efficiency is about seventy-eight percent to eighty-five percent.

  1. Smart Functions:

A lot of smart functions like the overheating sensor and self-diagnostic, etc. assist in automatically switching off the device in hazardous situations. For the outdoor fitting, there ought to also be the freeze protection, particularly if you live in a cold area.

The Cost Of The Electric Water Heating System:

There are two aspects that are included in the tankless heating system’s costs, one of which is the price of the device, and the other one is the using costs. Now let’s find a little bit about both of these aspects:

The Cost Of This Electric Water Heater


  1. Prices of The Tankless Heating Machine:

The electric tankless water heaters are much cheaper than the propane or gas-powered tankless heating units because the majority of which are the POS designs, flow rate, and power aren‘t so large. Therefore if you have less budget, you might contemplate purchasing a tankless heating device. The majority of them are under one thousand dollars.

  1. Using Costs:

When selecting a tankless device, the using cost is the key factor to think about. The upfront cost of these water units is quite cheaper. But the fitting costs, maintenance costs, and cost of heating is higher than the gas-powered tankless heating devices. If you don’t know anything about the electric heating units then don’t try to install it on your own. Always call a professional for doing this job. These systems also require regular maintenance. Thus the complete using costs are comparatively high.

Top 3 Best Electric Tankless Water Heaters:

Electric Tankless Water Heaters’ Types:

The following are a few types of  electric water heater units:Electric Tankless Water Heaters’ Types

  1. Portable Electric Tankless Water Heaters:

These portable water units have small flow rate of water but are lightweight. You can carry these ones anywhere you want and install them. If you like camping or traveling then this type is the best one you should go for. You can also use these  Portable Electric Units for your RV. If you want to know more about this portable heating devices, then check out the more detailed reviews we have provided.

  1. Whole-House Tankless Water Heaters:

In your daily life routine, you might require hot water in both your kitchen for washing the dishes and in your bathroom for taking a shower. If that is the case, then the whole house tankless water heating devices are the best option to go for. This one device will be enough for fulfilling the hot water requirements for your entire house.

But certainly the diverse size of house suits diverse whole house water heating device. If you have a big household and require using 3-4 bathrooms at the same time, then you should definitely choose the one that has a large flow rate of water. But if you live in a tiny house, then a mall one would be enough for the one bathroom only.

  1. Outdoor Electric Water Heaters:

As the name suggests, these types of tankless heating systems are designed to install outdoor. You can install this type of units on the outer wall of your bathroom. If you are going for this type, then you should also consider installing it with freeze protection system, especially if you live in the colder areas.

This system will help you protect your device from freezing in the bad weather conditions. A few devices area also equipped with the enclosure like the rain cap, for prolonging the service life of this tankless heating devices as much as possible.

Electric Vs. Gas Powered Tankless Water Heaters:

Electric Vs. Gas Powered Tankless Water Heaters

  1. Price:

Buying cost of the tankless heating units us far cheaper than the gas-powered ones. If you have a small budget, then the electric type would be best for you. But for the long terms of usage, using prices of the gas-powered tankless heating system is comparatively cheaper. So basically the complete costs of these two heaters’ types are the same, one gets much upfront, while the other one requires more cash on heating bills and maintenance in the later use.

  1. Energy Efficient:

The gas-powered heating devices and the electric ones that are available in the market are normally designed into the energy-efficient types. But the gas powered ones are three times more energy efficient than the electric tankless water heaters.

  1. Flow Rate And Power:

The tankless heating machine is less powerful, and the average rate of flow of  water is just around three GPM, while the gas-powered ones are more powerful. It is capable of supporting multiple faucets and bathrooms simultaneously. A few of the gas-powered tankless heaters can reach as large as nine GPM.

  1. Installation:

The tankless heating machine provides more flexibility in fitting; it is not subjected to the ventilation system or pipeline. Thus you can fit this type of heating machine anywhere you desire. But as for the gas-powered ones, you have to think about the ventilation system.

  1. Eco-Friendly:

The gas-powered tankless water machine employs propane or gas as the main power, they’re both clean sources and do bit damage to the surroundings, but also the CO2 is emitted in the using time. While conversely, the electric ones don’t directly release carbon dioxide but still has some bad influence on the surroundings if utilized for a long time.

The Problems Of The Electric Tankless Heater:

The following are a few problems of the electric tankless heaters:

  1. Not Effective In The Colder Regions:

You may find the electric heaters not so effective when you use them in the colder regions. The flow rate and temp will drop in the colder weather, the original water flow is already quite low, so it may not be capable of supplying hot water to your entire household there.

  1. Expensive:

The buying cost of the electric tankless heater is not very high, a few of these even take no more than five hundred dollars, but for a few cases, you have to change the cabling system of the house, and it takes a huge amount of cash, not to state the professional fitting. Using costs of these machines is also not a little deal, though come with the higher energy-efficient system, the water bills and cost of heatings are still higher than the propane or gas powered ones.

The Installation Of The Electric Tankless Water Heater:

The installation of the tankless electric heater is not a simple job, the working performance of your heater is to a great level closely related to its fitting if works wrong it might get broken or leak out easily. So followings are a few instructions about installing these devices:

  • For the indoor fitting, it’s great to be fitted near the main power panel or application fixture. The distance between the tap and the system determines the waiting time for the hot water, and the long waiting time signifies higher water bills. Thus if you fit it close to the POS, you can utilize the hot water in a few secs and less cold water will be wasted. Besides, when you want to fit it far from your power panel, it denotes you have to acquire extra tubes for the connection.
  • The majority of the electric tankless heaters are designed for the indoor fitting only; it can be fitted outdoor if permitted by the companies. But make certain there’s an enclosure outside the device for the outdoor fitting or continuously severe weathers like wind and rain will do permanent damage to your device and shorten its service life.
  • The tankless electric hot water heater ought to be fitted somewhere that’s easily accessible. Make certain you are capable of reaching and operating simply.
  • If the tankless  heater is fitted in your bathroom, make certain there’s a safe distance between the shower head and the machine, make certain it keeps dry and don’t get water all over it. And better to fit it where is ventilation and far from the moist places.
  • Always follow the instructions and utilize the heating device carefully, don’t cover anything on your heaters.

Frequently Asked Questions Section:

  1. Are The Tankless Electric Heaters Simple To Maintain?

The tankless electric heaters are so new; it can be hard to locate a technician to work on it.

  1. Are The Tankless Electric Heaters Cash Saver?

Yes, they are. The tankless electric heaters are capable of saving sixty percent energy and thirty percent money cost at a house every month.

  1. How Good Are The Tankless Electric Heaters?

The tankless electric heaters are lightweight; they can be a space saver and very energy-efficient. You can really fit them anywhere you feel like and it saves cash in purchasing and fitting a ventilation system. You ought to contemplate your actual requirements and select the most suitable one.

  1. Are The Tankless Electric Heaters Worth It?

The tankless electric heaters are highly energy-efficient and have a long life; they can last you for about twenty years if you maintain them well. Therefore, if you don’t have enough cash or don’t have a pipeline, you can select the tankless electric heaters. The high energy-efficient and high quality tankless electric heaters are perfectly worth the price.


The tankless heating devices that we have mentioned above are all different from each other you can use a few of them for a big family, a few for only point of use, while there are a few units that are equipped with higher technology. When you are purchasing a tankless electric heating system, you really need to consider your actual requirements and the total budget you have. For summing it all up, we have chosen three electric tankless water heaters for you:

If you want to buy any of these devices and want to know a little bit more about them, please visit the Amazon website. You might also find a large discount on different devices and can save cash.