A heat pump is a device which moves heat from one area, otherwise known as the ‘heat source’ to another area, ‘the heat sink’ using an electrical input which can produce up to five times its own power in heating.
We use a heat pump in our everyday lives because the essential components are simply those which make up a refrigerator.
When a refrigerator cools the internal box which keeps food cold and fresh, the surplus heat is vented out the back; this heat can be viewed as a ‘waste product’.
A heat pump works with the same technology in that a heat pump is trying to cool the outside, whether it be air, earth or water.
The ‘waste heat’ which the system produces is then utilised to provide ‘useful heat’ in a building.