Air-sourced heat pumps are a form of water heater that absorb heat from the outside air and transfer it into stored water. Although they run on electricity, they are approximately three times more efficient than standard electric resistance systems. When used in the right conditions they can save energy and money, as well as reduce greenhouse gas emissions.
Heat pumps operate on the same principle as a refrigerator or air conditioner, but in reverse. Instead of removing heat, the pumps harness it to heat water. Electricity is used to pump a refrigerant around the system, which collects heat from the air and transfers it into the water.
Heat pump water heaters are used to provide water heating for households and some commercial buildings.
Heat pumps are available in two configurations; integrated/compact systems, and split systems.
- Integrated/compact systems: the compressor and the storage tank are a single unit.
- Split systems: the tank and the compressor are separate, like a split system air conditioner.