page title icon 10 BEST ELECTRIC TANKLESS WATER HEATER FOR the WHOLE HOUSE 2021 | the list you need

Are you frustrated with your traditional water heater that runs hot water in no time and needs the best electric tankless water heater for the whole house? Then you have landed just at the right place. Here we shall provide you with every detail of some best electric tankless water heaters available in the market that are capable enough to supply plenty of hot water to the whole house.

But how are these tankless water beneficial and what are the advantages of installing an electric tankless water heater? Our team has done extensive research to answer these frequently asked questions? A whole-house tankless water heater is beneficial in the way that it can provide hot water to multiple faucets at the same time.

In a house, there can be hot water requirements for multiple purposes at the same time. Like two family members are taking shower in different washrooms at the same time. So if you do not have a whole house water heater installed you shall run out of hot water supply. Your water heater won’t be able to support this much water consumption because it’s not designed for that.

Whereas the best electric tankless water heater for the whole house is designed in such a way to fulfill the hot water requirement of multiple appliances simultaneously. They have a much higher flow rate than typical water heaters.

With the availability of these electric tankless water heaters, customers have taken a breath of peace. As they are highly efficient and saves a lot of consumer’s cost. There is no need to spend thousands of bucks and install multiple heating units, as a single water heater can do this job. Given below are the best electric tankless water heater for whole house reviews. We have collected this data after long research. Just go through the given below details to find a perfect fit for yourself.


After huge research, We have compiled a list of 10 best electric tankless water heater for whole house for you.

Image Product Details   Price
backpac Stiebel Eltron Brand: Stiebel Eltron
Model: Tempra 24 Plus
Weight: 16.1 Pounds
Voltage: 240 Volts
Amperage: 150A
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backpac Rheem 240V Brand: Rheem
Model: RTEX-13
Weight: 8.5 Pounds
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backpac EcoSmart ECO 27 Brand: EcoSmart
Model: ECO 27
Weight: 10.08 Pounds
Voltage: 220 Volts
Amperage: 112.5A
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backpac Rheem RTEX-24 Brand: Rheem
Model: RTEX-24
Weight: 17.8 Pounds
Voltage: 240 Volts
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backpac EcoSmart ECO 11 Brand: EcoSmart
Model: ECO 11
Weight: 6.5 Pounds
Voltage: 220Volts
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backpac Stiebel Eltron 224199 Brand: EcoSmart
Model: Tempra 24 Plus
Weight: 16.1 Pounds
Voltage: 208 Volts
Amperage: 150A
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backpac Ecosmart ECO 36 Brand: EcoSmart
Model: ECO 36
Weight: 18.3 pounds
Voltage: 240 Volts
Amperage: 150 Amps
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backpac Eemax EEM24036 Brand: Eemax
Model: EEM24036
Weight: 22.6 Pounds
Voltage: 240 Volts
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backpac Eemax SP3512 Brand: Eemax
Model: GID-478237
Weight: 3 Pounds
Voltage: 120Volts
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backpac Rheem RTEX-24 Brand: Atmor
Model: BD-27-DWH
Weight: 17.41 Pounds
Voltage: 240 Volts
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1. Stiebel Eltron
  • No Annoying Noises
  • Thermostat Temperature Control
  • Full Power Modulation Technology
  • Power Saver Monitor
  • Requires Proper Installation

Are you on a hunt for an electric tankless water heater that has a high flow rate with an Advanced Flow Control system, then Stiebel Eltron Tempra 24 Plus is the best option? The tankless water heater has a Flow Rate of up to 5.4 GPM. The Advanced Dynamic Flow Control Technology used in this water heater automatically detects the hot water requirements of faucets and adjusts the flow of the water heater accordingly. Now you will get an uninterrupted supply of hot water every time you turn on the tap.

The water heater features a digital temperature control display, with this user-friendly control the user can set the temperature of output water anywhere between 86 and 140F. The Full Power Modulation feature automatically sets the power high when water demand is high and consumes low power when less flow rate is demanded. In this way, it offers a 15-20% saving on water heating costs. The saver monitor helps you keep track of the energy-saving cost.  The unit has an exceptional efficiency that is 98%.

The most appealing feature of the unit is that it does not produce any annoying sound that most of the water heaters make. The system works quietly and efficiently. Stiebel Eltron Tempra 24 Plus has a very unique and elegant look. Due to its highly engineered design the unit is very small in size that fits perfectly indoors, thus saving a lot of space. All these features help this tankless water heater get the top position in the list of best electric tankless water heaters for the whole house.

Key Features

  • Flow Rate Up to 5.4 GPM
  • Sleek and Compact Design
  • High-Quality Copper Heat Exchangers
  • 98% Efficiency
  • Energy Factor up to 0.99
  • Advanced Dynamic Flow Control
  • Digital Temperature Display
  • External Thermostat
  • Power Modulation Feature
  • Energy Saver Monitor

2. Rheem 240V
  • Easy Installation
  • Highest Efficiency
  • Very Low Price
  • Copper immersion Components
  • Field-Serviceable Feature
  • Flow Rate comparatively Low

If you are a resident of a small apartment or a house that has one washroom, sink, or a place with limited requirements of hot water then Rheem RTEX-13 is the best option for you. Rheem is a renowned brand for manufacturing gas tankless water heaters but it does not only produce high-quality gas water heaters but also master in the production of some exclusively designed best electric tankless water heaters. They have a product option for every type of customer who have distinctive requirements.

Rheem RTEX-13 has been designed specifically for customers who live in small apartments with small space and hot water requirements. The model has a flow rate of 4GPM. The flow rate is sufficient to supply hot water to two to three faucets simultaneously.  The unit has an external digital Temperature Display. You can increment or decrement the temperature of output water by 1 Degree Fahrenheit by moving the knob clockwise and counterclockwise respectively. This electric tankless water heater has the highest efficiency of 99.8%. That makes the water heater worth investing in.

The feature that attracts a lot of customers towards its self is the field-serviceable feature. That means there is no need to uninstall the best instant water heater to do maintenance tasks on the unit. Who can resist buying an electric tankless water heater for the whole house when it is available at a cost as low as 255$.

Key Features

  • Compact Size 12.63 x 8.25 x 3.63 inches
  • 2 Copper Heating Components
  • Field Serviceable Feature
  • An efficiency of 99.8%
  • External Thermostat Temperature Control
  • Digital Temperature Display
  • Self-Modulation Power Control System
  • Lightweight and very Compact Design

3. EcoSmart ECO 27
  • Affordable Price
  • Up to 50 percent saving on water heating cost
  • Extremely Lightweight
  • Highly Durable Components
  • Needs Frequent Maintenance

EcoSmart a brand well-known because of its high-quality tankless water heaters. The brand leads the industry with its long line of some of the best electric tankless water heaters.  The specialty of the brand is the high-quality durable components that it uses while manufacturing these high-quality water heaters.

EcoSmart ECO 27 is among the best electric tankless water heaters for the whole house with an amazing flow rate of 6.6GPM. The flow rate is enough for supplying hot water to up to 4 shower heads at a time. The high efficiency of the unit brings a 50% reduction in your water heating cost. The stainless steel and strong copper interior of the water heater ensures the durability of the system. The parts are easy to replace and are a source of higher thermal efficiency.

Seriously considering the modern house’s space-saving requirements, this electric water heater has been given a space-saver design. That saves a lot of your valuable. ECO 27 is so compact that when you place it anywhere indoors it is hardly noticeable. Moreover, you get an instant supply of hot water at the point of use instantly, this saves a lot of time and water that’s usually being wasted while waiting for hot water. With the Self Modulating Technology, the one of best instant water heater does not consume any extra energy and only use the amount of energy sufficient to heat the required amount of water.

Key Features

  • Endless and Constant Supply of Water
  • 6.5 GPM Flow Rate
  • Stainless Steel and Strong Copper Heating Components
  • Space Saver Design
  • Advanced Self-Modulating Technology
  • Saves up to 50% Water Heating Cost
  • Sleek and Eye-Catching Design
  • Digital temperature Display
  • External Thermostat for Temperature Control
  • Durable and Easy Replacement of Parts

4. Rheem RTEX-24
  • High Flow Rate
  • Highest Efficiency
  • Compact and Sleek design
  • Affordable Price
  • Needs Professional Installation

Rheem RTEX-24, a tankless water heater that has all features to compete with any best electric tankless water heater available in the market is best to be used as a whole house electric tankless water heater. The unit has a flow rate up to 5.7 GPM. It’s among the highest flow rate any best electric tankless water heater offers.

Also, the unit has the highest efficiency of 99.8 %. If you want a water heater that does not just perform well but also looks elegant and fits perfectly into the interior of your house then you must opt for this tankless water heater. The look is extremely pleasing to the eyes. You get a lot of saving on your energy consumption cost with its Self-Modulating Technology that automatically detects the hot water requirements and adjusts the temperature accordingly. In this way not only do you save a lot of your water heating cost but you also get an instant supply of hot water. This feature makes it one of the best instant electric water heater.

The water heater has an external thermostat for temperature control.  All you need to do is move the knob left or right and set the desired temperature. Its compact size is ideal for a typical American house. These features help this product get top position in the list of best electric tankless water heater for the whole house.

Key Features

  • 5.7 GPM Flow Rate
  • Sleek Design
  • No venting required
  • Self-Modulating Power Technology
  • Dial Control for ON and OFF
  • LCD Display Screen
  • Durable Copper Immersion
  • 3 Copper Heating Units

5. EcoSmart ECO 11
  • Lifetime warranty
  • Very Budget Friendly
  • Space-saving appliance
  • Low electricity bills
  • Low flow rate

Whenever someone wants to buy something, he/she surely has a thought of getting an appliance having more warranty. EcoSmart introduces its model ECO 11 with a lifetime warranty. Is not it amazing? This feature assured to list it up in the most reviewed electric tankless water heaters.

It is mainly used to fulfill the needs of small offices or small houses. It gives up to 3 GPM warm water which is roughly estimated as a 1 shower bath. So, living alone or with a partner, it is the best thing you can choose. It is advanced with self-modulating technology that reduces power consumption and saves up to 60% of water heating costs. Also, it is a highly efficient product with advanced technologies and a uniform energy factor of 0.98. 

Everyone wants to buy a product having features with a good appearance just like the beauty with a brain. The feature that differentiates ECO 11 from the other best-selling tankless water heaters is its compact size due to which it can easily be fitted in small places of homes. It has 90% small in size than ordinary tanks.

It has a patented self-modulating technology that causes it to use less power to start. Contrary to other renowned electric tankless water heaters, it is very cheap. It also has an LED temperature display in front and controls 80 F to 140 F temperature. It consumes less power hence cause a major reduction in electricity bills. 

Key features

  • Flow rate up to 3 GPM
  • Advance self modulated technology 
  • LED temperature display
  • Compact size
  • External thermostat
  • Efficiency up to 99.8 %

6. Stiebel Eltron 224199
  • Highest Efficiency
  • 7 Years Leakage and 3 Years Parts Warranty
  • Technically Most Advanced
  • No Venting is required
  • No Venting is required

Want an endless and constant supply of hot water without fluctuations and interruptions? Then Stiebel Eltron might be the right choice. The electric tankless water heater with its 5 GPM Flow rate can fulfill your whole house hot water requirements. Now enjoy your hot water baths without being conscious of running low on hot water supply.

The one of best tankless electric water heater has so many features that many of the other best tankless water heaters lack. The unit minimizes the standby energy cost with its most advanced Self Modulating Technology. The features save up to 20% energy and you will observe a very noticeable decline in your water heating cost. The Advanced Self Modulating Function adjusts the water according to the user’s requirements.

The Advanced Flow Control is designed in such a way that the unit heats the water according to the required flow rate. The interior is made of high-quality heat exchangers that provide hot water supply on the go and there are no long waits of hot water when you turn on a tap. Another peculiar quality is the noise-free functioning of the unit, which further increases its efficiency, and the efficiency reaches up to 99%.

The model also has a very sleek and compact design that has been specially made for indoors. The compact size allows the user to mount the unit on a wall or place it anywhere on a cabinet. Due to all these features, the tankless water heater has got a distinguished spot in the list of top electric tankless water heaters for the whole house.

Key Features

  • 5GPM Flow Rate
  • Digital Temperature Display
  • Controlled Temperature Regulation
  • An External Thermostat
  • Efficiency Up to 99 %
  • Saves 15-20% Energy
  • Advanced Self Modulating Technology
  • Advanced Flow Control System
  • Compact Size 21.7 x 20.1 x 9.6 inches
  • High-Quality Copper Heat Exchangers
  • Constant Hot Water Supply

7. Ecosmart ECO 36
  • Highest efficiency
  • Saves up to 50% power consumption cost
  • Features Power modulation technology
  •  A little bit costly

ECOSMART is a well-known brand for its electric tankless water heaters.  It provides the best features to stand in the list of top-rated tankless electric heaters. ECO 36 has been designed in this way that it can easily meet the modern-day requirements.

In this busy world, everyone is busy and has no time to wait for others as it is disastrous to run out of warm water while taking a shower. To get rid of this problem, ECO 36 is the best choice as it provides a continuous supply of water having a flow rate of 8.7 GPM approximately. It gives enough warm water to run 4 showers and 1 sink at the same time. It can even provide a flow rate of 3.5 gallons per minute as low as 37 degrees F temperature.  It serves as a single working unit to meet the needs of warm water requirements of the whole house.

The tankless water heater has a compact size that can be easily installed at any place in your house and have a very decent look that is the main attention for buyers. Copper roads and stainless components installed in it increases its durability. It saves almost 50% of water heating cost as it instantly heat water when we have to use it. By saving sufficient energy the unit is 99.8% efficient. It has a digital output temperature display that makes it easy to set the desired temperature by incrementing or decrementing by 1 degree. ECO 36 is offering all these exceptional features in a small size so that it can be easily fit indoor.

Key features

  • 8.7 GPM flow rate
  • Digital temperature display
  • 99.8% efficient
  • Sleek and compact design
  • Self-modulating technology
  • High-quality copper rods

8. Eemax EEM24036

  • Compact size
  • High efficiency
  • Less power consumption
  • Easy installation
  • Quite Heavy

If you are interested in an electric tankless water heater for the whole home that instantly warm water when you want to use it then Eemax is giving you the best product. It provides a continuous supply of hot water by opening the shower or tap and automatically stop warming water after closing.

One of its best and advanced features is it senses how much warm water is needed according to input water temperature and adjusts itself. This self-modulating process saves many parts of energy and make it a 99.8% energy efficient device. Its heating components can be easily replaced and its top is made of brass that makes it a highly durable appliance.

It has a digital temperature display having an increment or decrement of 1 degree F to adjust it to the specific desired temperature. It gives a continuous and consistent supply of hot water having a flow rate of up to 6 GPM. Having the water saver shower head, its flow rate can be decreased as per requirement. It has a compact size that makes it more desirable and fascinating for buyers. Its appearance is the main attention of buyers. The best features in such a small size device make it compatible with the top listed tankless water heaters. It offers a 1-year warranty for its parts and a 5-year warranty for its leaks.

Key features

  •  Flow rate up to 6 GPM  
  •   Self-modulating power control
  • Brass top
  • Temperature sensors
  • Highly durable
  • LED temperature display

9. Eemax SP3512
  • 5 years Leak Warranty and 1 Year Parts warranty
  • Space-saving Design
  • Low electricity bills
  • Designed For Small families only

When a user is interested to get a budget-friendly whole house electric tankless heaters, he/ she may think of getting a device with low comparatively low price and good features. Eemax provides such a dream product with an extra feature of simple installation. It can be easily installed in homes because it has no P or T valves and no sweet joints. Just doing simple connections of one cold water line with lavatory also reduces the expenditure of a plumber or electrician. Its elements can be easily replaceable.

It consumes very little power to start and work by instantly heating water as per requirement. This feature makes it very efficient, having 99 % efficiency. The other feature buyers usually want to check is the size of the appliance. As compared with the other most wanted electric tankless water heaters, it has a compact size and low weight of just 3 pounds.

It can be operated at less voltage so no need for heavy cables and less danger of burning of any of its components. Its grey color adds up to its appearance. The whole power is used to heat water and there is no wastage of power in chimneys.

Key features

  • Highly efficient up to 99%
  • Compact size of 3 x 10.75 x 5.25 inches
  • Mini tankless electric heater
  • Advanced self-modulation
  • Simple and easy installation

10. Rheem RTEX-24
  • High Flow Rate
  • Highest Efficiency
  • Compact and Sleek design
  • Affordable Price
  • Needs Professional Installation

Rheem RTEX-24 is an electric tankless water heater very less known, but it has all the features to include this water heater in the list of best electric tankless water heaters for the whole house. The water heater has an exceptional flow rate of 5.3GPM that makes it a reliable choice for residential as well as commercial use.

The one of best water heaters can handle up to six appliances at a single time. There are no long waits for hot water if you can this water heater installed at your home. It has a very distinctive look from other best tankless water heaters. The water heater provides an instant supply of hot water the moment you turn on the faucets. The most advanced self-modulating technology used in this electric water heater not only saves valuable energy but also keeps the water regulating and adjusts according to the routine of the user.

The unit has a Digital Temperature Control Display. You can set the temperature according to your requirements, however the alteration in temperature can lead to the changed flow rate. But that’s the case with almost every tankless water heater. The water heater saves up to 50 percent on energy cost and that’s why the ideal water heater for the whole house is. The Manufacturer’s warranty ensures the durability of the unit.

Key Features

  • 5.3 GPM Flow Rate
  • Unique Design that saves space
  • Saves up to 50 percent on the energy-saving cost
  • Digital Temperature Control Display
  • No Venting Required
  • Advanced Self Modulating Technology

Ultimate Buyer’s Guide to Buy Best Tankless Water Heater

After reading the above given detailed review of some best tankless water heaters for the whole house you might have selected the one that just right for your use and fulfills most of your requirements. That’s perfect, but before making a final purchase you must consider some factors so you won’t have to regret it later.

Flow Rate (GPM)

If you are buying a tankless water heater for the whole house then the most important factor is the flow rate of the water heater. Flow rate is the number of gallons per minute that a tankless water heater can supply. If you want a water heater that you can use as a whole-house heating system then you must choose the one that has the highest flow rate. However, this is completely defined by the user’s requirements. A Flow rate of 5GPM can support the hot water need of a family of 3 members.

Power Input (BTU)

In the case of electric water heaters especially, you must seriously consider the input power ratings of the water heater. That will help you have a clear idea about your monthly water heating cost. Best whole house electric tankless water heaters use advanced self-modulating technology helps you save a lot on your water heating cost.


You must first set a price limit and look for a water heater that’s within your budget range. Setting a budget can help you select the best product that you can have. Preferable is that you select a water heater that offers maximum features while being affordable.

Size In modern homes, there is not plenty of space so you cannot accommodate large traditional size water heaters in your home. A good water heater is one that’s compact still diverse in features.


What is the major difference between a whole house tankless water heater and a simple tankless water heater?

A whole-house tankless water heater has a higher flow rate than simple tankless water heaters. It is capable to provide endless and constant hot water supply to multiple faucets at a time.

Can whole house electric tankless water heaters be installed inside?

Yes, most of the best electric tankless water heaters for the whole house have such a compact design that can be installed inside. Most of them are designed for indoor installation.

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