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Tankless Water Heaters

Although tankless electric hot water heaters can save energy, it’s possible your existing electrical service does not meet the instantaneous, electrical demand required for use of these tankless water heaters. In these situations, you will need to pay the cost of upgrading the electrical facilities that serve your home to use a tankless system.

To supply instant hot water, tankless water heaters require a large amount of power in a short amount of time. If the service to your home is inadequate for this demand, power quality problems may result for you and your neighbors’ homes.

Before you buy a tankless electric hot water heater, contact us, or call 208-388-2323 in the Treasure Valley or 1-800-488-6151 for a free electrical assessment.

What is a tankless water heater?

Tankless water heaters, also known as “point-of-use” water heaters or “on-demand” units, turn on when you open the hot water faucet and turn off when you close the faucet. The energy consumed is used to heat the water that flows from your faucet for immediate use. A traditional tank water heater stores and keeps water hot when you’re not using it, making it readily available when you need it.

Note that the temperature of incoming water can affect the performance of electric tankless water heaters, and some customers have been disappointed in the ability of these water heaters to maintain an adequate volume of hot water.

What do I need to do if I want to install an electric, tankless water heater?

Call Idaho Power’s Customer Service Center at 208-388-2323 in the Treasure Valley, or 1-800-488-6151, for a free electrical assessment. A customer service representative will put you in touch with a distribution designer who will check Idaho Power’s electrical equipment and facilities at your address. Idaho Power’s assessment will determine if you need to upgrade the electrical service to your home to support a tankless system.

What are Idaho Power’s requirements and limitations for electric water heaters?

Schedule 1 of Idaho Power’s Tariff, Residential Service, provides the limitations for electric water heating equipment for both Idaho and Oregon customers.

Rule K of Idaho Power’s Tariff, Customer's Load and Operations, outlines the limitations and responsibilities of both Idaho and Oregon customers related to power quality and reliability, including requiring that customers provide notice to Idaho Power before making significant changes to the amount or character of their electrical load.

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