Determine how many years it will take for the heat pump water heater to pay for its cost differential from the energy it saves.

A typical electric water heater has an efficiency of 90 percent and costs $390 a year to operate at a unit cost of electricity of $0.08/kWh. A typical heat pump–powered water heater has a COP of 2.2 but costs about $800 more to install. Determine how many years it will take for the heat pump water heater to pay for its cost differential from the energy it saves.

 

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Water

heater

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Type Efficiency
Gas, conventional 55%
Gas, high-efficiency 62%
Electric, conventional 90%
Electric, high-efficiency 94%

FIGURE P6–141

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