now for the science bit

The heat pump works in the same way as the fridge you have in your home.

Your fridge uses refrigerant to transport heat energy from the food inside the cabinet and that heat energy is transferred to the kitchen via the condenser; the warm tubes on the back of the fridge.

With the heat pump we take heat from the air and in some cases a river or borehole and the heat given off by the condenser is enough to supply hot water for heating and showers or baths.

Like the fridge at home, heat pumps are very reliable and cost little to run especially when compared to oil or LPG. 

How a heat pump system works

Using only a small amount of electric power the Energy Specialists air source heat pumps take around two thirds of their energy from the atmosphere. Even at ambient temperatures as low as –20ºC enough heat is absorbed by the liquid refrigerant to cause it to evaporate.

The refrigerant gas is then pressurised in a compressor causing its temperature to rise. This heat then transfers to water from the main supply and the refrigerant cools and condenses back to its liquid state then passes through an expansion valve and regains normal pressure ready to pass through the system again.