Certification Program
Find Residential Water Heaters in the AHRI Directory.

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Resources
Product-Specific Operations Manual

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Program Scope

• All electric, including heat pump, gas and oil water heaters having energy input ratings and capacities within the parameters outlined below are included in the program.
• Electric storage water heaters with energy input ratings of 12 kilowatts or less at a voltage no greater than 250 volts, and with a storage capacity of not less than 20 gallons nor more than 120 gallons, and electric heat pump water heaters with maximum current ratings of 24 amperes at a voltage no greater than 250 volts, which includes a storage tank with a rated capacity of not less than 20 gallons nor more than 120 gallons, and auxiliary water heating electric heat pumps with maximum current ratings of 24 amperes at a voltage no greater than 250 volts, intended for connection to an existing water heater or storage tank installation.
• Electric instantaneous water heaters with energy input ratings of 12 kilowatts or less with maximum voltage no greater than 250 volts.
• Gas storage water heaters with energy input ratings of 75,000 Btu/h or less and with a storage capacity of not less than 20 gallons nor more than 100 gallons.
• Gas instantaneous water heaters with energy input ratings greater than 50,000 Btu/h but less than 200,000 Btu/h, designed to deliver water at a controlled temperature of less than 180ºF (82.2ºC) and with a storage capacity of less than 2 gallons.
• Oil storage water heaters with energy input ratings of 105,000 Btu/h or less and with a storage capacity of 50 gallons or less.
• Heat pump water heaters with tank.
• Heat pump water heaters without tank.
• Combination water heater and space heaters.

This program independently verifies:
Efficiency: Energy Factor (EF)
Output: First Hour Rating, gallons (Maximum GPM)