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A typical electric water heater has an efficiency of 95 percent and costs $350 a year to operate at a unit cost of electricity of

A typical electric water heater has an efficiency of 95 percent and costs $350 a year to operate at a unit cost of electricity of $0.11/kWh. A typical heat pump-powered water heater has a COP of 3.3 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.

A typical electric water heater has an efficiency of 95

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