Best Electric Tankless Water Heaters


Why Electric Tankless Water Heater

There are many types of tankless water heaters. Some use gas and propane. Electric tankless water heaters are generally more convenient because you won’t have to worry about gas lines, leaks, or venting. You just have to rely on your electricity. But how do you choose the best electric tankless water heater? In this guide, we will take a look at the important factors that make an electric tankless water heater ideal for you.

Best Electric Tankless Water Heaters Comparison Table 2017

Rheem RTE 134$4240VNo
Ecosmart ECO 274.5$$$3240VYes
Stiebel Eltron Tempra 205$$$$4240VYes
Bosch Ariston GL6+S4$$6120VNo
Eemax EMT2.54$2.5120VNo

How to Choose the Best Electric Tankless Water Heater

When choosing which electric tankless water heater is right for you, you need to look at different aspects like the size of your home. You also have to check if you can manage its maintenance costs.

Here are the important things to consider when choosing an Electric Tankless Water Heater:

  • Hot Water Demand

    One of the first things you need to consider is how much hot water you need on a daily basis; How many people are going to use it and how big your home is. If you’re looking to install an electric tankless water heater for an office or an establishment like a spa, of course, you would need one that is intended for commercial use.

  • Gallons Per Minute (GPM)

    Once you’ve determined how much hot water you’re going to use regularly, check how many gallons of hot water the heater can provide per minute. This is also known as the flow rate. If you want ample hot water for the whole house or an average sized family, 2-4 gallons per minute is ideal.

    The Rheem RTE 13 Electric Tankless Water Heater, 4 GPM has this capacity. If you live alone or with a partner, 1.5 gallons per minute could be more than enough. You can see this on the specifications. Of course, the bigger the GPM, the more expensive the heater is.

  • Voltage

    See the voltage that the unit can accommodate. It ranges from 110V to 220V, or even 277V. You also need to check how much ampere it requires.

  • Circuit Breaker

    This is very important. Check if your electrical circuit can support your electric tankless water heater. Sometimes, it may require a separate circuit or circuits of its own.

  • Climate

    You need to consider the climate in your location and how cold it gets in the cold season. Some electric water heaters cannot produce hot water when the temperature drops below 35° F.

  • Temperature Control

    It would be nice if the unit has this feature so you can control how hot the water gets depending on the climate. Some offer digital temperature control of 1-degree increments so it is more precise.

  • Storage Space

    One of the big advantages of tankless water heaters from tank heaters is they take up less space. Still, you might want to check how much storage space it will take especially if you have a small bathroom. It would be great if it can be wall mounted.

  • Design

    It could be the least of your concerns but you don’t want a flimsy looking machine inside your bathroom, especially when you invite guests over. At least, choose a model with a design that goes well with your interiors.

  • Installation

    Check how easy it is to install the unit; if you can do it on your own following the manual or if you need to hire a professional. Normally, if professional installation is required, the manufacturer offers that service.

  • Warranty

    Make sure that the unit comes with a good warranty and what is included in it. Usually, labor is not included. The Ecosmart brand offers a lifetime warranty on their electric tankless water heaters.

Advanced Features

Here are some advanced features that you might find useful:

Other Considerations

  • Point of Use

    As opposed to whole house water heating systems, the point of use (POU) models is designed to provide hot water only up to two faucets. You can install them independently and can often be plugged into an outlet. They are compact and designed for under the sink; great for small clinics, boats, or RVs.


Choosing the best electric tankless water heater really depends on your needs. Reading reviews online and checking the product’s ratings will give you a good idea on how effective a unit is. But remember to consult with an electrician if necessary, especially before installation.

Further Reading on Tankless Water Heaters