13 Best 240V Electric Tankless Water Heaters for Whole House Use

240v hot water heater

Buying the best 240v tankless water heater is the must for nearly every family for indoor home use, for 240v is the common voltage residentially. The large demand means a large supply, and that is why you will find picking the ideal one on the market a difficult task.

Stop worrying about it now! We are here to pick out the best types to meet your various demands at a reasonable price. Plus, there are necessary buying guides you can never miss.

Now, let’s start!

Table of Contents show

What Is the Best 240v Tankless Water Heater For Whole House of 2020?

Comparison Chart of Top 240V Tankless Water Heaters

Photo Title Price Buy
Tankless Water Heater...image ECOTOUCH Electric Tankless Water Heater $119.99 Check Latest Price
Rheem 18kW 240V...image Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater $419.30 Check Latest Price
Rheem 240V Heating...image Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY $269.85 Check Latest Price
Ecosmart ECO 36...image Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater $394.99 Check Latest Price
Tankless Water Heater...image Tankless Water Heater Electric ECOTOUCH 9KW 220V 240V On Demand Water Heater Check Latest Price
Atmor AT-910-24TP ThermoPro...image Atmor AT-910-24TP ThermoPro 24 kW/240V Check Latest Price
Sio Green IR260...image Sio Green IR260 v2 POU Infrared Electric Tankless Water Heater Check Latest Price
Sio Green SIO18...image Sio Green SIO18 v2 Infrared Electric Tankless Water Heater Check Latest Price
Thermoflow 240V Electric...image Thermoflow Electric Tankless Water Heater $129.99 Check Latest Price
Stiebel Eltron 074054...image Stiebel Eltron 074054 240V Check Latest Price
Stiebel Eltron 224199...image Stiebel Eltron 224199 240V $698.00 Check Latest Price

Best 240V Tankless Water Heater Reviews For Your Money

1. EcoSmart ECO 11 Electric 240V Tankless Water Heater


instantaneous electric hot water heater 240v


  • Lifetime warranty
  • High energy efficient
  • Constant hot water supply
  • Saving 60% of heating costs
  • Patented self-modulating design
  • Small compact shape

2. Point of Use  – ECOTOUCH Electric 240v Tankless Water Heater


240v instant hot water heater


  • Sufficient hot water supply
  • No waiting time for hot water
  • Auto adjust power input based on flow rate and temperature
  • Optimal energy efficiency
  • Digital display and touch control panel
  • Remote control enables

3. Rheem 240V Residential Small RTEX-18 Tankless Water Heater


ecosmart eco 36 36kw 240v electric tankless water heater


  • External digital temperature setting
  • LED display
  • Advanced self-modulating
  • Copper immersion and durable material
  • Simple to install
  • Perfect for whole house to use

4. Cheap Price – Rheem 240v RTEX-13 Residential Tankless Water Heater


240v hot water heater


  • Digital control
  • LED display with 1-degree increment
  • Durable copper immersion
  • Self-modulating power control
  • 99.8% high energy efficient
  • Simple to replace

5. High Effiency – Ecosmart ECO 36 36kw 240v Tankless Water Heater


240v hot water heater


  • Sleek and compact shape
  • 99.8% energy efficient
  • Made in the USA
  • Reasonable price
  • Perfect for the house with 2-3 people to use

6. ECOTOUCH Self-Modulating Hot Water Heater


instantaneous electric hot water heater 240v


  • Sufficient hot water supply
  • Smart self-adjustment
  • easy and simple to get the ideal water temperature
  • 99.8% optimal energy efficiency
  • Micro-computer control and patent heating system installed
  • 100% safe

7. Atmor AT-910-24TP ThermoPro Digital Tankless Water Heater


240v tankless water heater


  • Easy to use
  • Multiple power available
  • 7-year limited warranty
  • High-quality internal materials
  • Adjust water temperature in 1-degree increment

8. Sio Green IR260 Point of Use Durable Water Heater


240v water heater


  • Features 4 power level
  • Patent technology
  • Long lifespan with delicate internal design
  • Point of use
  • Perfect for small house or kitchen under sink use

9. Sio Green SIO18 Infrared Electric Tankless Water Heater


240v electric water heater


  • Patent technology to the auto-adjust ideal power
  • Save energy and heating costs
  • Space-saving for small rooms
  • Budget-friendly
  • NO corrosion
  • Ideal for any home application

10. Rheem 240V RTEX36 Residential Tankless Water Heater


electric tankless water heater 240v


  • External digital thermostatic
  • LED display
  • Advanced self-modulation
  • Constant hot water supply
  • Simple to install
  • Large power for the large whole house to use
  • Durable and premium materials

11. Thermoflow Electric Tankless Water Heater with LED Digital Display


240v water heater


  • Upgrade heating technology
  • 2 seconds instant hot water supply
  • Self-modulating technology
  • Save around 60% on energy costs
  • Point of use or sink use only
  • Compact shape

12. Stiebel Eltron 240V Point of Use Single Sink Small Water Heater


240v tankless water heater


  • 50% less power consumption
  • Different power available
  • Resettable safety high limit switch
  • Lower installation costs
  • Quiet operation
  • Reasonable price

13. Stiebel Eltron 240V 24Plus Whole House Tankless Water Heater


electric tankless water heater 240v


  • Multiple powers available
  • No venting required
  • Digital temperature control
  • Save around 20% of heating costs
  • Sleek design
  • Compact shape saves much space

How Many Amps Does a Tankless Water Heater Use?

Purchasing an electric water tank needs more understanding before you can decide to buy it. One of the major concerns that people typically have is the number of amps that a tankless water heater use. Whatever the answer, it is first useful to note that there are very many tankless heaters that vary in this capacity.

Also, it will depend on the hot water consumption of the whole family. This being the case, we would approximate that an ideal tankless water heater uses at least 120amps to run. This figure may be higher depending on the size of the family and so the consumption. The total capacity for an overage home using a tankless water heater may be 200amp. It is sporadic to have a heater that employs more than 240amps for family usage. If you need one for commercial use, you might have to consider a higher capacity tankless heater.

When considering the amperage in buying your heater, you also got to consider the voltage requirement for that given heater. Most of the heaters in the market take 110V, 120V, 208V, 240V, or 277V. Ensure that you choose a voltage that you can manage so that you don’t complain about the high energy bills. Whoever the voltage that you choose, you should also consider checking the circuit breaker that can handle the voltage in case of any problem.

Which Is Better, Gas or Electric Tankless Water Heater?

When it comes to buying a tankless water heater, you might have to consider purchasing a gas generated one or an electric one. Well, some people are comfortable using electric ones while others are using the gas ones. Not everything that works for another person can work for you. You are a unique being. There are factors that you got to consider in making the right decision on which option you should go for. Have a look at some of them:

The cost

When talking about price, you got to start from the buying of the water heater, its installation, and finally, the operational cost. An electric water heater is more economical from its purchase to the operation. Depending on the capacity that you need, you can have an electric heater as cheap as $100 and $1,500 on the maximum.

On the other hand, you might need $150 on the minimum on the gas heater and $2,200 on the maximum. This tells you that a gas heater is more expensive to acquire than an electric one. The cost of electricity you will use to operate the heater is as well lower than that of the gas heater.


There is something unique when you talk about the durability of electric heaters. They are practically durable. In most cases, they can last for almost 20 years when that of gas can only last up to thirteen years. You deserve something that will serve you for longer. This makes the electric heater more convenient than the gas tankless water heaters.

In terms of service, the two options can give you some excellent service. You can, therefore, look at the two factors to make an informed decision. Most people, however, report that an electric tankless water heater is more convenient than the gas one.

Tips in Using 240v Tankless Water Heater

The following tips can enable you to enjoy the use of a 240v tankless water heater:

Always switch off the valve when not in use

Tankless water heater ensures that you get hot water at the time when you need it. The heating elements get heated once the switch is on so that any water that passes through them is heated. If you are using it for a shower, you will have to turn its switch on and also turn on the shower. The two should run at a go. If you are not using the shower, but you turn on the switch, the heating element might get heated and burn down when there is no water to heat. You, therefore, have to keep the switch off when you don’t need hot water.

Insulate your pipes

It is also to insulate your pipes, especially if you are living in cold places. This will save you from energy loss. You need the water as hot as it is heated on your output system. If you need water that is not too cold, then it is better to reduce the water temperature than to overheat it then have it cooled in the pipes. It is recommended to insulate the pipes.

Go for an indoor installation

The indoor installation is better than the outdoor installation. Most of the tankless water heaters occupy a very small space in the house. It would be unfair for you to place it outdoor. If you want it safe, you should have it in the house to avoid any destruction. Since it is small in size, it is good to install it in the house so that it is only water pipes that should channel the water for outdoor usage.

Things to Consider in Buying the Best 240v Tankless Water Heater

When purchasing the best 240V tankless water heater, there are given things that you should consider. Here are some of them:

The digital display

This is one thing that you should always consider. The digital display helps in customizing the operation mode, which allows you to manage and conserve energy. You don’t have to be surprised when energy bills come. Therefore, you should ensure that the tankless water heater that you go for has the display.

Valve material

When buying a tankless water heater, you need to consider a more durable valve material. Brass valves are more essential than the plastic valves. Brass is stronger and durable than the other options. This is why it is more considerable than any other material.

Your budget

You also got to consider the budget. You should not break your bank to have a tankless water heater. You should ensure that the cost is within your budget. The heaters cost differently based on capacity and the durability of the heater. Some brands will also give different prices for heaters with similar specifications. Based on your budget, do your window shopping wisely.

Summary: Top Rated 3 Best Buy 240V Tankless Water Heaters


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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