Residential Water Heaters
Certification Program

Find AHRI Certified® Residential Water Heaters.


Resources
Related Standard(s) and Documents
Additional Resources

Program Scope
  • Electric Storage Water Heaters with energy input ratings less than or equal to 12 kilowatts and has a storage capacity of not less than 20 gallons nor more than 120 gallons. Heat Pump Water Heaters that use electricity as the energy source, have a maximum current rating of 24 amperes for an input voltage of 250 volts or less, a storage capacity of not less than 20 gallons nor more than 120 gallons, and is designed to transfer thermal energy from one temperature level to a higher temperature level for the purpose of heating water, including all ancillary equipment such as fans, storage tanks, pumps, or controls necessary for the device to perform its function.
  • Gas Storage Water Heaters with energy input ratings less than or equal to 75,000 Btu/h, has a storage capacity of not less than 20 gallons nor greater than 100 gallons, and contains more than one gallon of water per 4,000 Btu per hour of input.
  • Gas Instantaneous Water Heaters with energy input greater than 50,000 Btu/h but less than 200,000 Btu/h, has a DOE Rated Storage Volume of less than 2 gallons, and contains no more than one gallon of water per 4,000 Btu per hour of input.
  • Oil Storage Water Heaters with energy input less than or equal to 105,000 Btu/h, has a storage capacity of 50 gallons or less, and contains more than one gallon of water per 4,000 Btu per hour of input.
  • Electric Instantaneous Water Heaters with energy input ratings less than or equal to 12 kilowatts, has a DOE Rated Storage Volume of less than 2 gallons, and contains no more than one gallon of water per 4,000 Btu per hour of input.
  • Residential-duty Commercial Water Heaters that meet the following criteria
    • For models requiring electricity, uses single-phase external power supply;
    • Is not designed to provide outlet hot water at temperatures greater than 180 °F; and
    • Is not one of the following:
      • Gas-fired Storage Water Heater with a rated input greater than 105 kBtu/h or a DOE Rated Storage volume greater than 120 gallons.
      • Oil-fired Storage Water Heater with a rated input greater than 140 kBtu/h or a DOE Rated Storage Volume greater than 120 gallons.
      • Electric Instantaneous Water Heater with a rated input greater than 58.6 kW or a DOE Rated Storage Volume greater than 2 gallons.

This program independently verifies:

Efficiency: Uniform Energy Factor (UEF)
Output: First Hour Rating, gallons (Maximum GPM)