8 Best Tankless Electric Water Heater for the Whole House for Your Money

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Just like gas-powered water heaters, tankless electric water heaters will save you lots of money on energy bills while still providing you with a constant supply of hot water. The traditional tank water heaters will just result in you using a lot of space and electricity but the tankless model will provide your hot water needs on-demand without the limitations tank water heaters are associated with.

What Is the Best Electric Tankless Water Heater for Whole House Use?

Quick Guide on Top 8 Tankless Electric Water Heaters for Large Whole House Use

Photo Title Price Buy
Rheem 240V Heating...image Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY $269.85 Check Latest Price
Rheem 18kW 240V...image Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater $419.30 Check Latest Price
EcoSmart ECO 11...image EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology $201.49 Check Latest Price
EcoSmart ECO 27...image EcoSmart ECO 27 Electric Tankless Water Heater $431.11 Check Latest Price
Stiebel Eltron 239223...image Stiebel Eltron Tankless Water Heater $734.46 Check Latest Price
Atmor AT-910-24TP ThermoPro...image Atmor AT-910-24TP ThermoPro 24 kW/240V 4.6 GPM Digital Tankless Electric Water Heater Check Latest Price

Best Tankless Electric Water Heater for the Whole House Reviews

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

whole house electric tankless water heater reviews


  • External digital thermostatic control panel
  • Easy to adjust the temperature with 1-degree
  • Durable copper immersion heating elements
  • 99.8% energy efficient
  • Simple installation
  • Perfect for 2-3 people use

2. Rheem 240V RTEX-18 Residential Tankless Water Heater

electric on demand hot water heater whole house


  • LED display
  • Advanced self-modulation technology
  • Auto adjust power to meet hot water demand
  • Durable copper materials for durability
  • High flow rate to 4.4 GPM
  • Small compact shape to save space
  • Easy replacement and installation

3. EcoSmart ECO 11 Electric Water Heater

rheem whole house electric tankless water heater


  • Lifetime warranty
  • Save 60% heating cost
  • Constant hot water supply
  • High energy efficient
  • Patented self-modulating technology
  • Sleek look

4. Rheem RTEX – 36 Residential Tankless Water Heater

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  • LED display with external digital thermostatic
  • Auto adjust power
  • High quality and durable internal materials
  • Simple to install
  • Easy to operate
  • Large flow rate for whole house use

5. EcoSmart ECO 27 Electric Tankless Water Heater

whole house electric water heater tankless


  • Save 50% on water heating costs
  • Digital temperature control
  • Copper and stainless steel components
  • Compact sizes for small space use
  • High energy efficient
  • Reasonable price

6. Hyperikon Electric Tankless Water Heater

best whole house electric tankless water heater


  • Constant hot water supply
  • Easy to operate control panel
  • High energy efficient
  • No pre-heating
  • 5-year warranty
  • Easy and fast replacement

7. Stiebel Eltron Tempra 29 Plus Tankless Water Heater

electric tankless water heater for whole house


  • Multiple power available
  • Sleek design
  • No venting required
  • Easy to install
  • Long life
  • Large power for whole-house use

8. Atmor AT – 910 – 24 TP ThermoPro Digital Tankless Water Heater

whole house electric heater


  • Easy to use
  • High-quality stainless steel components
  • Can adjust the water temperature in 1-degree increment
  • Multiple power available
  • Affordable price
  • Compact and lightweight shape for a small house to use

How Good Are Tankless Electric Water Heaters?

Going to the shower only to find there is no hot water could be described as the worst thing that can happen to you on a busy morning. With a tankless water heater, this is a situation you do not have to deal with, water is heated on demand, you are certain that when you get into the shower you will get hot water for the day. The initial installation price may be high for a tankless water heater but it will save you a lot of money in the long run.

Besides energy-saving tankless water heaters will save space in your house as they usually come in compact designs. They are also considered more environmentally friendly as there is no rusty tank to be disposed of in the trash. The electric tankless water heater will also not emit greenhouse gases to the atmosphere.

The tankless models also typically come in longer warranties usually 15 years giving you peace of mind. Electric tankless water heaters are 99% efficient which makes them a pretty good choice, however, some homes are not designed to accommodate a tankless water heater and may require rewiring your house to install the electric tankless water heater, some homeowners may feel this to be too much of a hassle and prefer an alternative water heater.

Electric Tankless Water Heater vs. Electric Tank Water Heater

With a tank water heater, you are likely to experience a time when you do not have hot water for your needs. This can be especially cruel when you have to take an ice-cold shower early in the morning before you head out for work, it can be a real mood dampener. This is unlike the tankless models which will provide hot water on demand. Besides the inconvenience of failing to provide hot water upon demand, the tank water heater is designed to keep heating the water, if nobody is home the water will cool down then it is reheated again in an endless loop. This is a waste of energy and your electricity bills will keep going higher.

The tank water heater will need extra space for storing the tank, unlike the tankless unit. The tankless water heater is also more durable with a longer warranty, unlike the tank water heater. The tankless water heater, however, has a higher initial cost compared to the tank counterpart especially if you are replacing a tank model. It is worth noting that, you will incur lower electricity bills with the tankless model than with the tank water heater due to its high energy efficiency. Tank water heaters are rather simple making them easier and less expensive to repair, unlike the tankless models that are quite complex and thus more expensive to repair.

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What Size of a Tankless Water Heater Do You Need for Your House?

instant hot water heater electric whole house

Tankless water heaters are designed to provide hot water on demand; however, they have a limit to the amount of water they can heat at a given time. It is therefore important that you choose the right size to ensure it meets all your household hot water needs. Tankless water heaters are rated using the maximum water flow rate at particular temperature rise.

Before you settle for the size, you need to know the number of gallons per minute of hot water you need at any given time as well as the required temperature rise. The number of gallons per minute is determined by the number of appliances you run. The total flow rates for all the devices will give you the flow rate for your tankless water heater.

Consider the temperature rise, the incoming water temperature will differ depending on the climate of the area you live in. The difference between the incoming water temperature and the output water temperature gives you the temperature rise. Usually, you will need your water heated to around 110 degrees F, assuming the incoming water temperature is at 50 degrees F that gives you 60 degrees F temperature rise. It is important that you use a lower temperature for the incoming water to ensure that you do not undersize your tankless water heater.

Combining the temperature rise and the flow rate you need will you will get the right tankless water heater that you need.

How to Choose Best Tankless Electric Water Heater for the Whole House

There are several factors to consider when choosing the best tankless electric water heater for your home.

  1. Understanding the hot water needs for your home – this is on top of the list, your hot water needs will determine the size of the water heater you need.
  2. Design – ensure the water heater’s design is compatible with the area of installation.
  3. Affordability –  you cannot buy what you cannot afford, check for the model that lines up with your financial situation.
  4. Ease in installation – you should consider if the water heater requires you to make major changes. The electrical system upgrade does not come easy and may increase the installation cost.
  5. Energy efficiency – ideally, electric tankless water heaters are highly efficient, with about 98% energy efficiency, however, you should understand that despite the high efficiency, it still requires a substantial amount of energy to run which may mean upgrading the electrical systems in some cases.
  6. The unit’s warranty – check the unit’s warranty to ensure its satisfactory. Remember that you will use this unit for a long time and a warranty can save you lots of money on repairs.

Electric tankless water heaters are a great choice, take time to check the one that best suits your needs and you are good to go. You will have a constant supply of hot water in your home on demand while still maintaining low electrical bills.

Summary: 3 Best Tankless Electric Water Heaters for the Whole House


Will Montgomery

Will Montgomery: Electro-Mechanical Engineer, Serial Entrepreneur, and Real Estate Enthusiast. Met David at Penn State, where he earned a BS in Electro-Mechanical Engineering and a minor in Business. Expertly manages capital equipment manufacturing, refurbishing, and repair businesses, while exploring opportunities in real estate and advocating for practical heating solutions.

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