The new line of A. O. Smith electric tankless water heaters provide an energy efficient and easy-to-install solution for your home or business. Designed for both whole-house water heating and specialized applications, A. O. Smith has the lineup of electric tankless water heaters to meet your specific needs.

babies in bathtub.

Continuous Hot Water

Electric tankless water heaters provide continuous hot water when sized appropriately, producing and maintaining hot water throughout your home or business as needed.

Space Savings

A. O. Smith lightweight and easy-to-install electric tankless water heaters can be mounted in small or tight spaces throughout your home.

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modern bathroom view.

No Venting Required

Unlike gas tankless water heaters, A. O. Smith electric tankless units do not need venting to operate, saving space in your home along with initial installation costs.

A Closer Look

Diagram of the interior of a tankless water heater.

How Do Electric Tankless Water Heaters Work?

Electric tankless water heaters are quickly growing in popularity given their potential energy savings and ability to deliver hot water on demand. Electric tankless water heaters assist in reducing the energy consumption within your home by not having to heat water in storage tanks that goes unused. A. O. Smith electric tankless models perform with high efficiency ratings and groundbreaking designs. They serve a wide range of applications, whether it be point-of-use or whole-house. These models deliver continuous hot water when you need it and they can be easily installed in places where tank water heaters can’t go, including closets and bathrooms.
Electric tankless water heaters heat your home’s water on demand. When a hot water tap is turned on, water from your pipes enters the water heater and passes through the heat exchanger. Within the heat exchanger, there is an electric resistance coil that warms the water to the desired temperature as it travels through. When sized appropriately, a constant supply of hot water is delivered to your home with ease.

Both electric tank and electric tankless water heaters have their specific advantages. Electric tankless units can potentially help you save on home energy use and provide continuous hot water on demand. However, you should consider your usage preferences, energy supply, and space considerations when talking with your local water heater service provider.

A. O. Smith electric tankless water heaters can provide hot water on demand and energy savings, all while taking up less space in your home. We recommend talking to a licensed professional before making the final decision on a water heater purchase. They will be able to offer guidance regarding electrical service requirements and any additional components needed for installation.

There is a potential to save energy with electric tankless water heaters. The electric tankless unit will only heat the water that you use and does not have the standby heat loss that typically comes with traditional tank-type products.

The A. O. Smith limited warranty for electric tankless water heaters is 5 years. However, if properly maintained, electric tankless water heaters can last between 10 and 15 years. Water conditions and the amount of use will determine the life of the product. While we do have scale reduction technology, it will not completely mitigate the effects of scale.

Electric tankless products do work in cold climates. However, there are a few things to keep in mind. Colder climates mean colder incoming groundwater temperature, resulting in a need for more energy to heat the water to your desired temperature. Colder incoming groundwater temperature will limit the product options to the higher kW units, which require a larger electrical service and breaker size capacity. If there is adequate electrical service and room in the breaker panel, electric tankless is a great option.

What do I need?
Electric tankless units install similarly to an electric tank-type product. All you need is electricity and water. When having an electric tankless water heater installed by a professional, be aware of the electrical service requirements, the additional wires needed for installation, and your home’s climate. We recommend talking to a licensed professional before making the final decision on a water heater purchase.

Size?
The factors that will affect the size of your electric tankless water heater are the incoming groundwater temperature, hot water flow rate required, electrical service, and breaker panel restrictions.

Where to install?
Electric tankless water heaters can be installed in any location within your home with the appropriate hookups. Their compact size frees up valuable space within your home. Common applications include offices, lavatories, and remote fixtures.

Venting?
No venting is required for A. O. Smith electric tankless water heaters.

Compare:
Electric Tankless Water Heater

Electric Tankless Water Heater

R4MA-320E

Electric Tank Water Heater

Electric Tank Water Heater

ENT-50

Single Shower Length* Unlimited 27 minutes
Back-to-Back Showers* Unlimited 3.4 showers
Showers at the Same Time* 1.7 showers 2.9 showers
Maximum Tub Size* Unlimited 75 gallons
Continuous Hot Water check_circle_outline
Space Savings check_circle_outline
Hot Water Storage Supply check_circle_outline
Venting Requirements None Product Specific
*Many factors affect the actual performance of a water heater. This represents our closest approximation of your likely experience with this water heater in your local area, but actual performance may vary depending on factors beyond our ability to control or estimate.
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Contractor Resources

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    Installation Guide

    Download our gas tankless water heater installation instructions.

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    Resource Guide

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