"Truly Inspirational!"
Air-Source Heat Pump

Outside air is blown over an evaporating coil by a big fan. The gas in the evaporating coil is very cold (it has a boiling point of -40°C) so it will absorb heat from the outside air even when the temperature is down to -15°C. The warmed refrigeration gas goes into a compressor which adds more heat and energy and raises the temperature to 75°C.
This hot gas now goes into a condensing heat exchanger where it passes heat to water which is pumped around Newt Cottage radiators.

For every 1KW of energy used it creates 2 - 4KW (depending on air temperatures). This can be compared with oil or gas central heating boilers which put out less than 1KW for every KW they use.