Ask an Expert: Heat Pump Water Heater Efficiency
Are heat pump water heaters more efficient than natural gas units?
The efficiency of a water heater is measured by energy factor (EF), which indicates the amount of hot water produced compared to the amount of power or fuel consumed. The higher the energy factor, the more efficient the water heater.
Heat pump water heaters have a much higher energy factor than conventional units; a typical heat pump unit has an EF of 2.0, compared to 0.65 for a high-efficiency natural gas storage system.
It's important to remember that a higher energy factor doesn't always result in lower operating costs. If you are considering a heat pump water heater, take into account the size of the unit, your water heating needs and energy prices.
If you choose to install a heat pump water heater, purchase a unit that is ENERGY STAR® qualified for high-efficiency performance. ENERGY STAR units can save the average household up to $300 in annual energy costs, according to the U.S. Environmental Protection Agency.
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