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Residential Water Heaters

Regulatory Language for State Equipment Standards

Residential water heater means a product which utilizes oil, gas, or electricity to heat potable water for use outside the heater upon demand.

Electric storage water heater means a water heater that uses electricity as the energy source, is designed to heat and store water at a thermostatically controlled temperature of less than 180F, has a nominal input of 12 kilowatts or less, and has a rated storage capacity of not less than 20 gallons nor more than 120 gallons.

Gas storage water heater means a water heater than uses gas as the energy source, is designed to heat and store water at a thermostatically controlled temperature of less than 180F, has a nominal input of 75,000 Btu per hour or less, and has a rated storage capacity of not less than 20 gallons nor more than 100 gallons.

Oil water heater means a water heater that uses oil as the energy source, is designed to heat and store water at a thermostatically controlled temperature of less than 180F, has a nominal input of 105,000 Btu per hour or less, and has a rated storage capacity of 50 gallons or less.

Gas instantaneous water heater means a water heater that uses gas as the energy source, initiates heating based on sensing water flow, is designed to deliver water at a controlled temperature of less than 180F, has an input greater than 50,000 Btu per hour but less than 200,000 Btu per hour, and has a manufacturer’s specified storage capacity of less than 2 gallons.

The minimum efficiency standards for residential water heaters shall be the levels set forth in the table below determined in accordance with the test procedures set forth in 10 Code of Federal Regulations (CFR) part 430, Subpart B, Appendix E

Electric Storage Water HeaterGas-fired Water HeaterOil-fired Water HeaterOil-fired Instantaneous Water Heater
0.97 - 0.00132 x Volume (the rated storage volume of water storage capacity as specified by the manufacturer) 0.67 - 0.0019 x Volume (the rated storage volume of water storage capacity as specified by the manufacturer) 0.59 - 0.0019 x Volume (the rated storage volume of water storage capacity as specified by the manufacturer) 0.62 - 0.0019 x Volume (the rated storage volume of water storage capacity as specified by the manufacturer)

Beyond State Equipment Standards

Federal Energy Management Program
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Product Listings

GAMA: An Association of Appliance and Equipment Manufacturer
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Other Tools

Federal Energy Management Program
Electric and Gas Water Heater Cost CalculatorLink opens in new window - close new window to return to this page.

Last Updated: 12/11/2013