The basic principle is as simple as it is brilliant, taking the free energy that exists in the air and ground and convert this energy into heating your home. This heat can then be used to heat radiators, underfloor heating systems, or warm air convectors and hot water throughout your home.
For every 1kW of electricity fed into an Ecodan heat pump unit (outdoor unit) you could achieve at least 3kW of heating energy. An air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside. It can get heat from the air even when the temperature is as low as -15° C.