Heat-Pump Water Heaters

Electric heat-pump water heaters use compressors to evaporate and condense refrigerant in a closed loop, pulling heat from the air—similar to an air conditioner—and transferring that heat into water stored in an insulated tank. They are available as retrofits that connect to standard storage-type water heaters, or as stand-alone products with integral tanks. A heat-pump water heater can achieve an energy factor of 2.0 or higher, while a storage-type electric water heater relying on electric-resistance heating elements has a theoretical maximum energy factor of 1.0. The performance of some of these products is measured using “coefficient of performance” or COP, but there is no standard for COP, so manufacturer claims may not be comparable.

Listed in: Plumbing

Products in Heat-Pump Water Heaters