energy star

The Tank energy star

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  • #11523

    is the only differance between an energy star rated water heater & one not rated the amount of insulation ?

    Larry Weingarten

    Hello: Insulation matters, but it isn’t that simple. Here is a link that gives some detail.

    Yours, Larry


    Electric water heaters all use electricity at 100% efficiency. Differences in the amount of energy they use in a year for a given amount of hot water is insulation and heat traps. Since all electric water heaters use electricity at 100% efficiency none are rated as energy star.

    You can buy a heat pump whose sole purpose is to take heat from the air and make hot water. It will make hot water at 1/2 to 1/3 the cost of resistance heat. To qualify for the tax credit the EF (energy factor) must be greater than or equal to 2.0.

    There are a lot of factors which make a gas water heater more efficient: Tankless, power vent, condensing, etc. You have to take into account utility rates, efficiencies, and amount of HW used.


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