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Best Electric Tankless Water Heater For Whole House (2024 Updated)

If you’re looking for an efficient way to heat your whole house’s water supply, an electric tankless water heater may be the solution for you. Unlike traditional tank water heaters, tankless models heat water on demand and do not store hot water, which can be a more efficient use of energy and save you money.

Before buying an electric tankless water heater, there are some factors to consider. The size of your home and family, the water usage and flow rate of your fixtures, and the electrical requirements for the unit are important things to factor in. It’s also important to choose a reputable brand with good customer reviews and a warranty, as well as ensure that the unit is the correct size and compatible with your home’s electrical setup.

Is your current water heater costing you too much money in energy bills? Are you tired of running out of hot water during your showers or bath time? Have you heard about the benefits of an electric tankless water heater but aren’t sure if it’s right for your home? Keep reading to learn more about how a tankless water heater can benefit your home and which factors to consider before making a purchase.

10 Best Electric Tankless Water Heater For Whole House

# Product Image Product Name Product Notes Check Price
1
Ideal for providing on-demand hot water in residential and commercial buildings with high demand and limited space.
2
This product is ideal for providing endless hot water for residential and whole house showers.
3
This electric water heater is ideal for providing hot water on demand with high efficiency and space-saving design.
4
It is an electric water heater that provides hot water on demand for a whole house.
5
The product is ideal for providing hot water to an entire house without the need for a storage tank.
6
The product is ideal for providing hot water at the point of use with digital temperature control and compact design.
7
It is ideal for providing instant and endless hot water on demand for small to medium-sized homes or apartments.
8
Ideal for providing hot water on demand to a whole house, with energy efficiency and self-modulation technology.
9
The product is ideal for providing instant and precise hot water for small to medium-sized residential or commercial applications.
10
The product is ideal for providing hot water quickly and efficiently without the use of a traditional tank.
Ideal for providing on-demand hot water in residential and commercial buildings with high demand and limited space.
This product is ideal for providing endless hot water for residential and whole house showers.
This electric water heater is ideal for providing hot water on demand with high efficiency and space-saving design.
It is an electric water heater that provides hot water on demand for a whole house.
The product is ideal for providing hot water to an entire house without the need for a storage tank.
The product is ideal for providing hot water at the point of use with digital temperature control and compact design.
It is ideal for providing instant and endless hot water on demand for small to medium-sized homes or apartments.
Ideal for providing hot water on demand to a whole house, with energy efficiency and self-modulation technology.
The product is ideal for providing instant and precise hot water for small to medium-sized residential or commercial applications.
The product is ideal for providing hot water quickly and efficiently without the use of a traditional tank.

1. Eco-On-Demand Tankless Water Heater – Stiebel Eltron

The Stiebel Eltron Tempra 24 Plus is a sleek, space-saving water heater that provides uninterrupted hot water for your entire home, thanks to its advanced Flow Control technology. This patented technology automatically adjusts the water temperature to maintain constant comfort, even if hot water demand exceeds capacity. The unit's small, white design saves space and does not require venting. It is also eco-friendly, with auto-modulation and electronic water flow control that saves energy. The savings monitor displays how much you save on energy costs. The unit is easy to operate, with an electronic switch and a noise-free operation. The digital temperature display and preset temperature and memory buttons make it easy to customize the settings to your liking. The unit's interior solid copper heating system does all the power work.

The Tempra 24 Plus model has a power output of 24kW and requires a minimum recommended electric service of 150A. It can heat water to a temperature range of 68° to 140°F, and you can set the maximum hot water temperature to 109°F to prevent scalding. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels.

Stiebel Eltron's electric tankless water heaters are top-rated for their comfort and reliability. The Tempra 24 Plus model comes with a 7-Year Leakage Warranty and a 3-Year Parts Warranty.

Pros

  • Advanced Flow Control technology maintains constant water temperature for uninterrupted hot water.
  • Sleek, white design saves space and does not require venting.
  • Eco-friendly with auto-modulation and electronic water flow control that saves energy.
  • Easy to operate with digital temperature display, preset temperature and memory buttons, and noise-free operation.
  • Solid copper heating system does all the power work.

Cons

  • – Requires a minimum recommended electric service of 150A.
  • – Maximum hot water temperature is limited to 109°F, which may not be hot enough for some users.

2. Thermomate Electric Tankless Water Heater – Endless Hot Water!

The Instant Unlimited Hot Water tankless electric water heater is a reliable and efficient solution for providing hot water as quickly as you need it. This electric water heater requires three sets of double-pole 40AMP breakers to achieve 240V, and it can provide hot water in just 3 seconds. With a flow rate of 5.27GPM at a 35°F rise, you'll never run out of hot water again. The self-modulating power technology only uses energy when it's needed, making it up to 99.8% efficient and saving up to 60% on water heating costs compared to traditional tank water heaters. The wall-mounted and compact design saves floor space and is versatile enough to fit into tight spaces.

This electric water heater also features stable water temperature control with an auto-adjusting energy consumption based on incoming water temperature and flow. The digital temperature display allows for easy temperature adjustment in 1° increments from 80°F to 140°F. The heating element is separated from the water tube, which significantly reduces scale, corrosion, and mineral buildup on the element, improving performance and reducing maintenance.

Installation is made easy with ETL certification, overheating protection, and auto-stop heating when no water is detected. Quality workmanship ensures leakage protection, and the unit includes a 2-year limited warranty and 24/7 customer support services. However, make sure to verify that this water heater is the correct size for your hot water needs. Please be aware that this water heater requires 27kW at 240V, drawing a maximum of 114Amp, and the wire gauge is 3 x 8AWG. The unit size is 17.12" x 13.12" x 3.12", and the water connection is 3/4" NPT.

Pros

  • Provides hot water in just 3 seconds
  • Self-modulating technology saves up to 60% on water heating costs
  • Stable water temperature control with an auto-adjusting energy consumption based on incoming water temperature and flow
  • Digital temperature display allows for easy temperature adjustment
  • Heating element separated from the water tube reduces scale, corrosion, and mineral buildup, improving performance and reducing maintenance
  • ETL certification, overheating protection, and auto-stop heating for safe and easy installation
  • Quality workmanship ensures leakage protection
  • 2-year limited warranty and 24/7 customer support services

Cons

  • – Requires three sets of double-pole 40AMP breakers to achieve 240V
  • – Requires proper sizing to ensure it meets your hot water needs

3. Tankless Hot Water Unit By Black+decker

Experience endless hot water with automatic water flow sensors with the powerful 36kW heating system of this hot water on demand unit. It is perfect for an entire home to receive instant hot water in seconds. The self-modulating unit allows you to set and maintain the desired temperature in increments of 1℉ through an easy-to-use and read digital temperature display. The unit is versatile and convenient for both commercial and residential use. Warm to hot climates can benefit from this hot water tank designed for the entire home. It is ideal for use in showers, sinks, bathrooms, washing machines and kitchens. The wall-mounting design saves space and allows you to install it virtually anywhere – in a cabinet, closet, garage or basement. With the compact unit size, no bulky hot water tank is needed, which saves up to 50% on heating costs as water only heats when you need it. The unit is reliable and durable with an extensive warranty of 7-year leakage-free coverage, 5-year heat exchanger and 2-year parts. The internal canisters and piping are made of durable stainless steel and non-corrosive materials, which provide increased heating efficiency and life expectancy. The unit is also lead-free. Installation is easy and requires 4 x 40 amp single-phase double-pole breakers, 4 x 8/2 AWG wire size and 240V. The unit does not require gas lines or venting, and comes with standard 3/4 in. NPT (straight thread) fittings.

Pros

  • Provides endless hot water with automatic water flow sensors
  • Versatile and convenient for both commercial and residential use
  • Saves space and allows installation virtually anywhere
  • Saves up to 50% on heating costs as water only heats when needed
  • Reliable and durable with an extensive warranty
  • Increased heating efficiency and life expectancy through durable stainless steel and non-corrosive materials
  • Lead-free
  • Easy installation
  • No gas lines or venting required

4. Titan Tankless N-210 Whole House Water Heater System

This water heater provides an endless supply of hot water for your home, ensuring that you never run out of hot water during peak usage times. It is designed to be highly efficient, which means that it can save you up to 50% on your hot water bill compared to traditional water heaters.

With its advanced technology, this water heater is able to heat water on demand, rather than storing it in a tank like traditional water heaters. This means that it only uses energy when you need hot water, which helps to reduce your energy costs and your carbon footprint.

In addition to its energy-saving benefits, this water heater is also highly durable and easy to maintain. It is built to last for many years, and requires very little maintenance to keep it running smoothly. Overall, this water heater is an excellent choice for anyone who wants to save money on their hot water bill while enjoying a constant supply of hot water for their home.

Pros

  • Provides endless hot water for your entire home
  • Can save up to 50% on your hot water bill
  • Highly efficient and eco-friendly
  • Durable and easy to maintain

5. Ge Electric Tankless Water Heater – Compact & Efficient

The Tankless Electric Water Heater is an excellent solution for those who want an endless supply of hot water. It provides instant and continuous water flow, making it ideal for households and apartments alike. The unit can produce up to 5.4 gallons per minute (GPM), which is enough to run one faucet and three showers simultaneously in warm climates. The results are based on 72˚F inlet water temperature and 105˚F outlet water temperature.

The water heater has an intuitive interface that allows users to adjust temperature and settings with ease. Its touch screen is simple to use, and the compact design of the unit takes up significantly less space than a tank-style water heater. This design allows for more efficient use of space in your home.

One of the best things about the Tankless Electric Water Heater is its energy efficiency. It only uses energy when hot water is in use, which means it conserves energy and water, saving you money in the long run. With this water heater, you can enjoy endless hot water without worrying about high energy bills.

Pros

  • Provides instant and continuous water flow
  • Suitable for both households and apartments
  • Can produce up to 5.4 gallons per minute (GPM)
  • Intuitive touch screen interface
  • Compact design saves space
  • Energy-efficient, saves money in the long run

6. Rheem 11kw 240v Tankless Electric Water Heater

The ON/OFF Dial Control with adjustable digital temperature display makes the hot water heater easy to operate. The self-modulating power control allows you to adjust the energy consumption to your needs. The 11kW Model Flow Rate can reach up to 2.68 GPM, providing you with a steady flow of hot water on demand. The hot water heater features 1/2" NPT water connections on the side, making installation quick and easy. With this hot water heater, you can enjoy consistent and continuous hot water whenever you need it.

This hot water heater is perfect for small to mid-sized homes. It can easily provide hot water to a bathroom and a kitchen simultaneously. It's also ideal for RVs, boats, and cabins where space is limited.

The hot water heater is equipped with safety features, such as overheat protection and dry heating protection. The overheat protection automatically shuts off the heater when the temperature exceeds the preset limit, while the dry heating protection turns off the heater when there is no water flow. These features ensure safe and reliable operation.

Pros

  • Adjustable digital temperature display for easy operation
  • Self-modulating power control for energy efficiency
  • Provides on demand, consistent and continuous hot water
  • Easy to install with 1/2" NPT water connections on the side
  • Equipped with safety features for safe and reliable operation
  • Suitable for small to mid-sized homes, RVs, boats, and cabins

Cons

  • – May not be suitable for larger homes with high hot water demand
  • – May require professional installation for some users

7. Ecotouch Electric Water Heater: Instant & Eco-Friendly!

The ECO180B tankless hot water heater electric is a powerful and efficient way to provide instant and sufficient hot water for your entire house. With an 18kW smart heating system, this water heater can supply hot water of 120℉ or higher in seconds, eliminating the need for preheating and preventing temperature fluctuations during shower time. This makes it the perfect companion for everyday use, including showering, sink faucets, dishwashers, and washing machines.

The electric on demand tankless hot water heater ECO180B features self-modulation technology that adjusts the power input based on current flow rate and temperature setting. This ensures that less power is consumed when the water flow is reduced, resulting in an ideal temperature instead of scalding hot water. This feature ensures a comfortable experience and excellent energy efficiency, with an optimal energy efficiency of 98% that saves considerable electric charge for you.

Temperature setting is easy with the digital display and touch control panel that comes with the electric tankless water heater 18kW. The useful information displayed on the screen helps you get a full understanding of the working status of the water heater. The newly updated model comes with multiple protections, such as leakage protection, over heating protection, and auto stop, ensuring 100% safety. It is listed by ETL and qualifies for UL. The inner water and electricity lines are designed to run separately, which avoids leakage risk and scale build-up, ensuring outstanding performance for years to come.

The sleek and compact design of the ECO180B tankless water heater makes it possible to install it anywhere point of use to avoid waste, ideal for shower, kitchen, bar, school, and hair salon. Please verify that it is the right size for you: 18kW at 240V(only); dimensions 12.22" (W) x 17.25" (H) x 4.02" (D); plumbing connections :3/4" NPT. In order to install 18kW Tankless Water Heater, it would require 240V, 2X40AMP Double Pole Breaker, and 2X8AWG/2 wires with Grounding.

Pros

  • Powerful 18kW smart heating system provides sufficient instant and endless hot water of 120℉ or higher in seconds
  • Self-modulation technology adjusts exact power input based on current flow rate and temperature setting, ensuring comfortable experience and excellent energy efficiency
  • Digital display and touch control panel makes temperature setting an easy job
  • Multiple protections, such as leakage protection, over heating protection, and auto stop, ensure 100% safety
  • Sleek and compact design makes it possible to install anywhere point of use to avoid waste

Cons

  • – Requires 240V, 2X40AMP Double Pole Breaker, and 2X8AWG/2 wires with Grounding for installation

8. Eemax Spex95t Lavadvantage Thermostatic Electric Tankless Water Heater

The microprocessor temperature control of this water heater ensures accurate temperature regulation, while the copper pipe compression fittings, available in both rear and bottom electric entry, provide a secure and reliable connection to your water supply. It can be used for both hot and cold water feed and is 99% efficient, making it a cost-effective solution for any home. This water heater is perfect for use in the kitchen sink, bar sink, hand set showers, pool house, spare bedroom and vacation homes. It can also be used as an in-line booster for existing tank heaters, or as a backup system for solar heating. With its ability to produce hot water immediately, this water heater eliminates long waits for hot water, gradually reducing its power input as the hot water from the tank arrives.

Whether you need hot water for cooking or bathing, this water heater is the perfect solution. Its compact size and efficient design make it an ideal choice for any home, while its reliable performance ensures that you always have hot water when you need it. With its easy-to-use controls and versatile installation options, this water heater is a must-have for any homeowner.

Pros

  • Microprocessor temperature control for accurate temperature regulation
  • Fitted with 1/2 inch Copper pipe Compression fittings for a secure and reliable connection
  • Hot or cold water feed, making it ideal for any home
  • 99% efficient, making it a cost-effective solution
  • Eliminates long waits for hot water by producing hot water immediately then gradually reducing its power input as the hot water from the tank arrives

Cons

  • – No significant cons found

9. Eemax Spex3012t Lavadvantage Thermostatic Electric Tankless Water Heater

The microprocessor temperature control in this product ensures accurate temperature, which can be used with both hot and cold water feeds. It is fitted with 1/2 inch copper pipe compression fittings with rear or bottom electric entry. This device is perfect for use in various establishments such as kitchen sinks, bar sinks, pool houses, spare bedrooms, vacation homes, and in-line boosters for existing tank heaters. It eliminates the long waits for hot water by producing hot water immediately and gradually reducing its power input as the hot water from the tank arrives. Additionally, this device can serve as a backup system for solar heating and is 99% efficient.

This product offers you an excellent solution to the problem of waiting for hot water. It provides a constant supply of hot water, and the microprocessor temperature control ensures accurate temperature regulation. You can use this device in various establishments, and it's easy to install thanks to the 1/2 inch copper pipe compression fittings. It is an efficient device that can help you save energy while providing a steady stream of hot water.

Get rid of the frustration of waiting for hot water with this in-line booster. This device is perfect for use in various establishments, and it's easy to install. It is fitted with 1/2 inch copper pipe compression fittings with rear or bottom electric entry. You can use it as a backup system for solar heating and eliminate the long waits for hot water by producing hot water immediately and gradually reducing its power input as the hot water from the tank arrives. This device is 99% efficient, and it ensures accurate temperature regulation through its microprocessor temperature control.

Pros

  • Microprocessor temperature control for accurate temperature regulation
  • Can be used with both hot and cold water feeds
  • Fitted with 1/2 inch copper pipe compression fittings with rear or bottom electric entry
  • Ideal for various establishments such as kitchen sinks, bar sinks, pool houses, spare bedrooms, and vacation homes
  • Eliminates the long waits for hot water by producing hot water immediately and gradually reducing its power input as the hot water from the tank arrives
  • Can serve as a backup system for solar heating
  • 99% efficient

Best Electric Tankless Water Heater For Whole House FAQs

Are there any potential drawbacks to using an electric tankless water heater for a whole house?

Yes, there are potential drawbacks to using an electric tankless water heater for a whole house. One of the main drawbacks is the cost of installation. Electric tankless water heaters require a high voltage electrical circuit, which may require an upgrade to your home's electrical system. This can be costly and time-consuming.

Another potential drawback is the limited flow rate. Electric tankless water heaters are designed to heat water as it flows through the unit, which means that the flow rate is limited by the size of the unit. If you have a large family or use a lot of hot water, you may need multiple units to meet your needs.

Additionally, electric tankless water heaters may not work well in areas with hard water. Hard water can cause mineral buildup in the unit, which can reduce its efficiency and lifespan. You may need to install a water softener or descaler to prevent this issue.

Finally, electric tankless water heaters may not be as reliable as traditional tank-style water heaters. They are more complex and may require more maintenance and repairs. Overall, while electric tankless water heaters can be a good choice for some households, it is important to consider these potential drawbacks before making a decision.

How does an electric tankless water heater work for a whole house?

An electric tankless water heater is a great solution for those who want to have hot water throughout their house without the need for a bulky water tank. Unlike traditional water heaters, electric tankless water heaters heat water on demand, meaning that they do not store hot water in a tank. When you turn on the hot water tap, cold water travels through the heater and is heated by an electric element. The heated water then travels to the faucet, providing you with hot water for your needs.

Electric tankless water heaters are designed to handle the hot water needs of an entire house, but it is important to choose the right size unit for your needs. Factors such as the number of people in your household, the number of bathrooms and appliances that require hot water, and the temperature of the incoming water will all impact the size of the unit needed.

Overall, an electric tankless water heater is an efficient and cost-effective solution for providing hot water to your entire house. It eliminates the need for a bulky water tank, saves energy, and provides hot water on demand.

How much energy does an electric tankless water heater for a whole house consume?

An electric tankless water heater for a whole house typically consumes between 12000 to 28000 watts of electricity. The exact amount of energy consumption depends on the model and capacity of the unit. A tankless water heater heats water as it flows through the unit using heating elements powered by electricity. This means that it only uses energy when hot water is needed, unlike traditional tank water heaters that constantly consume energy to keep the water hot.

Although electric tankless water heaters are more energy-efficient than traditional tank heaters, they may still consume a significant amount of electricity depending on usage. It is essential to consider the size and capacity of the unit and your household's hot water needs when selecting a tankless water heater. Additionally, you may want to consider using a timer or smart thermostat to regulate the heating elements and reduce energy consumption further. Overall, an electric tankless water heater can be an excellent investment for energy-conscious homeowners looking to reduce their carbon footprint and save on energy bills.

What are the benefits of using an electric tankless water heater for a whole house?

Electric tankless water heaters have become increasingly popular as an alternative to traditional storage tank heaters. One of the main benefits of using an electric tankless water heater for a whole house is energy efficiency. Unlike storage tank heaters that continuously heat and store water, electric tankless water heaters only heat water when needed, resulting in lower energy consumption and cost savings on your energy bills.

Another benefit is the unlimited hot water supply. With a tankless system, you won't have to worry about running out of hot water in the middle of a shower or while doing laundry. Tankless heaters heat water on demand, providing an endless supply of hot water for your entire household.

Electric tankless water heaters are also more compact and require less space than traditional storage tank heaters. This makes them an excellent choice for space-limited homes or apartments.

Lastly, electric tankless water heaters have a longer lifespan than storage tank heaters. With proper maintenance, an electric tankless water heater can last up to 20 years or more, compared to the average 10-15 year lifespan of a storage tank heater.

Overall, electric tankless water heaters offer many benefits for whole house use, including energy efficiency, unlimited hot water supply, space-saving design, and longer lifespan.

What size electric tankless water heater is needed for a whole house?

The size of an electric tankless water heater needed for a whole house depends on several factors. The number of people in the house, the number of bathrooms, and the daily hot water usage all play a role in determining the appropriate size.

For a small to medium-sized family of up to four people, a tankless water heater with a flow rate of 5-6 gallons per minute should be sufficient. However, for larger families or homes with multiple bathrooms, a higher flow rate of 8-9 gallons per minute might be necessary.

It's also important to consider the temperature rise needed in your area. The colder the climate, the higher temperature rise required, which means a larger unit is needed.

Ultimately, it's best to consult with a professional plumber or electrician to assess your specific needs and determine the appropriate size for your whole house. They can also provide advice on the brand and model that would best suit your household's requirements.

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