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    What is the Energy Factor on the Hot Water Tank screen?

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    A water heater's energy efficiency is determined by the energy factor. The energy factor (EF) indicates a water heater's overall energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day.

    The higher the energy factor, the more efficient the water heater. Product literature from a manufacturer usually provides a water heater model's energy factor.

     

    Below are some example energy factors:

     

    Water Heater Type

     

     

    Efficiency Factor

     

     

    Approximate Annual Cost

     

     

    Estimated Lifetime Savings

     

    GAS      
    Standard Tank
    .58 – .60
    $250
    n/a
    Energy Star Tank
    .67 – .70
    $225
    $250-$300
    Non-Condensing Tankless
    .82 – .85
    $175
    $1,150-$1,500
    Condensing Tankless
    .92 – .94
    $150
    $1,500-$2,000
    Hybrid Condensing Tankless
    .92 – .96
    $130
    $1,800-$2,400
    ELECTRIC      
    Standard Tank
    .90 – .93
    $500
    n/a
    High-Efficiency Tank
    .94 – .95
    $485
    $150
    Hybrid Heat Pump
    2.0
    $250
    $2,500+
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