How it works

1.In an air source heat pump, outside air is drawn over the evaporator. The refrigerant absorbs heat from the air and changes from a liquid to a vapour.

2.The refrigerant then passes through a compressor, increasing the pressure and consequently the temperature of the vapour. This higher temperature is now suitable for domestic heating

3.The higher temperature refrigerant then passes through the condenser heat exchanger, transferring heat to the heating system. With the heat now removed, the refrigerant returns to liquid. The liquid refrigerant then passes through the expansion valve, returning the refrigerant to its original state ready to repeat the cycle. A heat pump typically consists of four main components; evaporator, compressor, condenser and expansion valve. A refrigerant is circulated around these components