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by Answerbag Staff on June 11th, 2010

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What is the term used to describe the efficiency of a water heater?

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  • by Contributing Writer on June 11th, 2010

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    Different types of hot water heaters have different terms applied to them to describe their efficiency. A solar hot water heater is rated by SEF (solar energy factor) or SF (solar fraction.) A tankless water heater is given an EF (energy factor) rating. Conventional storage-type water heaters are given an R-Value, which describes the rate of thermal resistance (heat loss) from the tank.

    References:

    U.S. Department of Energy Energy Savers: Energy Efficiency--Hot Water Heaters

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