Best Electric Tankless Water Heater for Whole House

According to the need and choice, different people select different types of tankless water heaters. Few people want gas tankless water heaters, few electric ones, and few want portable tankless water heaters. The choice of the water heater depends upon the needs. Similarly, people having big families are looking for the best electric tankless water heater for the whole house.

Large tankless water heaters provide enough hot water for a whole family. It can fulfill the needs and provide unlimited hot water without using much energy. So instead of buying several small tankless water heaters, buy a large one and enjoy hot water all day.

   Types Of Whole House Tankless Water Heaters

A whole-house heaters water heater can be divided into three main categories according to the power source, which includes;

  • Whole house gas tankless water heater propane tankless water heater
  • Electric tankless water heater

Whole House Gas Tankless Water Heater

This water heater is powered mainly by natural gas; it is the most powerful water heater among the three kinds. It can heat water from cold incoming water temperature; it is relatively cheap compared to other whole house gas tankless water heaters. Ventilation facilities are required for their safe usage.

Whole House Propane Tankless Water Heater

The propane tankless water heater is quite the same as the natural gas water heaters; most of the time, both can be available. It is also required ventilation facilities to run correctly. It can be installed indoors and outdoors based on the product requirement.

Whole-House Electric Tankless Water Heater

Electric tankless water heater for the whole house run only on electric power. It is suitable for residential use because it will not require an extra pipeline, and no ventilation is needed. Its installation spots are flexible, so you can install it anywhere you want. Electric tankless water heater costs will be a bit expensive compared to gas and propane tankless water heaters. The electric tankless water heater can save 60% of energy costs.


Best Tankless  Water Heater For Large Families

A large tankless water heater is enough for the whole family and can use for multiple uses. You can use hot water while taking a bath and at the same time someone can wash dishes in the kitchen you will never run out of hot water. Let us now see the list of the best tankless water heater for the whole house.

1-Ecosmart 27 tankless water heater-whole house electric tankless water heater

EcoSmart ECO 27 electric tankless water heater
EcoSmart ECO 27 electric tankless water heater

Ecosmart is an electric tankless water heater that provides 6 GPM of hot water. But in a cold climate, it will provide 3 GPM of hot water. With this flow rate of hot water, you can run 2 showers at the same time. Ecosmart is capable of providing constant hot water all day.

It also saves 50% on water heating costs and is more energy-efficient. The self-modulating feature of this unit ensures that the unit will use energy only when hot water is needed. This is one of the most durable units that is made of good components. Due to these stainless steel high corrosion resistance ability ecosmart tankless water heater lasts longer.

You can change the temperature of this unit by an increment of one degree. So you can easily reach the required temperature.

Things we like?
  • Provide 6 GPM of hot water
  • Energy efficient
  • Space saver
  • Easy controllable digital control system
  • Perfect for a large house
  • Replaceable heating parts
Things we don’t like?
  • Temperature setting is difficult
  • Installation is difficult

Check Price on Amazon 

2-Stiebel Eltron tankless water heater-whole house electric tankless water heater

Stiebel Eltron Tempra Plus 24 kW, tankless electric water heaterProviding 5GPM of hot water-stable Eltron is the best electric tankless water heater for a whole house. This unit is enough to supply unlimited hot water for all domestic tasks. This unit also has self-modulating technology that reduces energy consumption and uses energy only when needed.

So you can save your energy cost. The most interesting feature of this unit is its advanced flow control module that regulates the water pressure automatically. You will get constant hot water due to the advanced flow control feature. This unit maintains the temperature during different flow levels and can be used for commercial use.

Things we like?
  • Reliable
  • More energy efficient
  • Advanced flow control feature
  • Unlimited hot water
  • Self-modulating technology
  • Amazing design
  • Space saver
  • Quite working situation
Things we don’t like?
  • Difficult to install

Check Price on Amazon 

3-Rinnai propane tankless water heater-whole house electric tankless water heater

Rinnai RL Water Heater Indoor InstallationRinnai tankless water heater provides 9 GPM of hot water that is a high flow rate. You can use multiple bathrooms at the same time without the shortage of hot water. You can use hot water in the bathroom, kitchen, and laundry without spending much because the self-modulating feature of this unit reduces the energy cost and uses energy only when needed. So no energy is wasted, and you can save energy costs.

This unit provides a temperature range between 98 to 185 degrees. You can easily set the required temperature of your water and can enjoy hot water anytime. The digital temperature control unit makes it easy to set the required temperature. Rinnai propane is a gas tankless water heater for the whole family that is easy to use. The dial is so smooth that you can rotate it easily and can change the temperature.

This unit is also used for commercial use. The ThermaCirc360 technology recirculates hot water into the pipe, and you will get hot water quickly. It’s a space-saver unit and is compact in size with an amazing design. Due to its small suitcase size, you can install it anywhere, even in the closet.

Things we like?
  • Energy efficient
  • High-temperature range
  • Easy to operate
  • Space saver
  • Compact size
  • Thermacir360 technology
  • Provides 9GPM of hot water
  • Unlimited hot water that will never run out
Things we don’t like?
  • Difficult to install
  • Take a minute or two to start

Check Price on Amazon

4-Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On-Demand Hot Electric Tankless Water Heater 

Stiebel Eltron is a heavy-hitting best electric tankless water heater for the whole house. The Stiebel Eltron makes German engineering and outstanding, hands-on experience regarding tankless water heaters. To buy Stiebel Eltron, you can rest easy that you’re buying the best electric tankless water heater for the whole house.

Their grey Tempra and Tempra Plus series are undergoing a cosmetic refresh. Their new water heater range comes with a shiny new housing and an improved display with a thermostat interface which includes:

  • Flow rate meter
  • Temperature memory buttons
  • Energy monitor

Beyond the cosmetic changes and display and thermostat improvements, Stiebel Eltron is the same unit. Its digital display on the team helps to adjust the desired temperature. The bar displays the power capacity status.

It’s Self-Modulation Energy technology in which Tempra Plus uses to ensure the unit uses the least amount of energy to heat the water. Stiebel Eltron also has advanced sensors to monitor the temperature of the incoming and outgoing water. It helps to measure the flow rate as the water passes through the heater. The microprocessor processes the data and adjusts the heating element as needed to deliver hot water. This is the best whole house electric tankless water heater 2021 because it is made with advanced Flow Control features, making the Tempra Plus a quality product.


Quality artistry

Advanced Flow Control

Temperatures during high demand periods

Without mechanical switches, it is virtually silent

Self-Modulation Energy technology

Very accurate digital controller

Saves space


Higher priced

Slightly lower GPM

Bottom Line

5-Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

If you’re looking for a compact tankless water heater for your residential uses, consider Ecosmart ECO 36. This is the best electric tankless water heater if you remodel your home or add a new bathroom. It is an excellent solution for those areas where space is limited, such as boats and cabins.

The ECO 36 compact design will not take too much space on your wall or floor. It has an easy-to-read digital temperature display that allows you to see the temperature of the water at all times. This electric Tankless Water Heater is a sleek design with a digital output temperature display. It can provide between 3.6- and 8.7-gallons hot water per minute, which is ideal for 1 to 2 bathrooms.  Ecosmart ECO 36 electric tankless water heater is also the best solution for large homes that require regular nonstop hot water for showers, washing dishes, and laundry. ECO 36 tankless water heater provides up to 4 times more energy savings than conventional tank heaters.


Save space up to 90%

Powerful and proficient

Lifetime warranty for residential

Allows adjusting the temperature

Energy-saving features


Installation may require electrical upgrades

Living in cold climates can affect

 6- Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Rheem is a well-known American tankless water heaters brand. Due to its advanced features and specifications are on our list of the best electric tankless water heater whole house reviews. Rheem tankless electric water heater brand offers numerous electric tankless water heaters in different sizes and features.

Rheem 240V RTEX-24 is the second largest model following the RTEX-36. These two models can also be used as whole-house electric tankless water heaters.

THE Rheem RTEX-24 electric tankless water heater has three heating chambers for the whole house, so you need three double poles 40-amp breakers. Its temperature flow rate ranges start from 1.5 GPM to up to 5.7 GPM, which will make it a perfect choice for residential use. For safe usage, I know you should have at least a 150-amp service to use it safely for your whole house.


Very accurate digital controller

Saves space

Extremely powerful and efficient

Unlimited hot water

American brand


Takes about 10-15 seconds to get fully hot

7-Bosch Thermo-technology – WH27 Tronic 6000 C -Electric Tankless Water Heater 

Bosch electric tankless water heater is the best choice for smaller households, office suites, and garage apartments. You can easily use it for more than 1 or 2 applications at a time.

Bosch Tronic 6000 C flow rate range starts from 2 GPM to 3.5 GPM, which is lower than previous models. This electric tankless water heater for the whole house requires three double poles 40-amp breakers and may draw up to 120 amps at full load.

The activation flow rate of the Bosch electric tankless water heater is at 0.8 GPM. If you will half-open the water tap, Bosch wouldn’t ignite and run, and you’ll get cold water from your tap. To get it to work proficiently in hot water, you’re going to need to open it fully. Bosch Tronic 6000 C is the best option as a whole house tankless water heater if you live in a smaller household of 2 or 3 people and your hot water demand isn’t very high.


Reliable brand

Compact sizes

Excellent customer service

Very accurate digital controller

Saves space


High activation flow rate

8-Rheem 240V 3 Heating Chambers RTEX-27 Residential Tankless Water Heater, GRAY

Rheem tankless water heater consider as one of the top brands in the water heater industry. Rheem RTEX-27 would not disappoint you due to its extra advance and user-friendly design, and minimalistic appearance. This whole house electric tankless water heater delivers a powerful stream of hot water while maintaining an impressive energy efficiency of up to 99.8%.

Rheem tankless water heater’s exclusive design provides you plenty of interior features, which makes it one of the most comprehensive, self-modulating electric tankless water heaters for the whole house on the market. It will offer you a handy tool that helps you find a suitable unit for your geographic area and household needs. This is the best electric tankless water heater that delivers up to 4.0 GPM at a 46F temperature rise, making this one of the most influential electric tankless water heaters.


3 Copper Immersion heating elements

Extremely powerful

Its optimal conditions can deliver a maximum GPM of 6.6

Temperature range: 80 to 140°F

Very accurate digital controller

Saves space



Professional Installation is recommended

9- Eemax EEM24036 Electric Tankless Water Heater, Blue

Eemax EEM24036 is a 36kW whole house electric tankless water heater that can provide you nonstop hot water for your entire home. It will give you up to the 8 GPM flow rate of the hot heater. Eemax EEM24036 quickly provides enough hot water to supply a three-bathroom with 2-3 showers running simultaneously.

Eemax EEM24036 has inside four heating chambers 9kW each. You should be able to allocate four double poles 40 AMPS breakers to safely run this tankless electric water heater. This tankless water heater is the best electric tankless water heater; you won’t be disappointed after purchase it.


Compact design

Extremely powerful and efficient

Simple Installation

Silent work


Requires much space in the service panel 

Essential factors to consider Best Whole House Tankless Electric Water Heater

There are whole multiple houses tankless water heaters are available in the market. You can easily find various of the best tankless water heaters brands with advanced technical features, sleek designed a significant flow rate. Before selecting the best whole house tankless water heater, here in this section, I mentioned some factors to consider while buying entire home tankless water heaters, such as;

Flow Rate

As a whole-house tankless water heater, the flow rate must be significant enough for the whole family’s use. Therefore, choosing the best full house tankless water heater is necessary to buy the average hot water for your daily use. If you have a small family and need 1-to-2-bathroom hot water, a low flow rate around 3-5 GPM makes your everyday life easier. If you intend to use three or four bathrooms in warm places simultaneously, you need to get a significant flow rate near a 9 GPM heater.


Power is crucial in running a water heater proficiently, even though some whole house tankless water heaters lack enough power. Sometimes it is making it too hard to support constantly hot water. A great power full house tankless water heater can provide nonstop water for you and your loved ones.

 Home location

The performance of tankless hot water I dependent upon using situations and weather. The temperature range and water flow are high in warm areas, turning into a low-rate heater in cold regions. Therefore, you should choose the most suitable one based on your home location.

Energy efficient

A whole-house tankless water heater needs to consume a large amount of water each minute; therefore, if you can find a high-energy efficient type, you can save much money in the context of each month’s heating bills.

     Advantages of an Electric Tankless Water Heater

  • A tankless water heater is a demand-based system that provides higher energy efficiency due to the complete absence of standby losses.
  • Electric tankless water heaters have an energy factor of 95% or higher.
  • If a traditional heater’s water tank runs out of hot water, a tankless water heating system will provide an endless hot water supply.
  • Tankless electric water heaters are relatively small and fit in tight spaces.
  • Electric tankless water heating systems don’t require venting.
  • Tankless electric water heaters are cheaper than gas-powered units in terms of initial cost and installation expenses.

                         Frequently Asked Questions (FAQ)

Which brand of electric tankless water heater is the most reliable?

Stiebel Eltron Tankless Water Heater is the most reliable brand of the electric tankless water heater. They made the most advanced thermostatically-controlled electric tankless water heater, which is highly suitable for the whole family.

What is the downside of an electric tankless water heater?

Tankless water heaters produce an endless supply of hot water, have a lower risk of leaking. They have a significantly longer lifespan as compared to traditional water heaters. The cost of electric tankless water heaters is considerably higher than tank-style heaters.

Are tankless water heaters suitable for large homes?

Tankless gas water heaters typically generate higher flow rates for larger homes.


Traditional water heaters do not work well if you live in an apartment or small house to do your household chores. Stiebel Eltron Tankless Water Heater – Tempra 24 Plus is the most popular choice because it is super space-efficient. Suppose you are willing to invest in a more seamless experience. In that case, Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater can handle everything you might throw at it, from cold weather to high demand. It’s ideal for medium-sized homes and smaller installations in colder climates. For this guide on the best electric tankless water heaters, we listed the nine most popular options on the market. You can count our listed research to guide you to a mindful purchasing decision.

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