Do Heat Pump Water Heaters Make Sense In a Passive House?
Treehugger recently covered a townhouse in Brooklyn designed to the Passivhaus standard that included a heat pump water heater (HPWH). Unlike regular electric water heaters that convert electricity to heat, a heat pump water heater has a compressor, much like in a fridge, that moves heat from the air to the water. This is purported to use less energy.