Heat pumps

A heat exchanger is a device that allows heat from a fluid (a liquid or a gas) to pass to a second fluid (another liquid or gas) without the two fluids having to mix together or come into direct contact. The essential principle of a heat exchanger is that it transfers the heat without transferring the fluid that carries the heat; this is commonly applied to a heat pump.
Heat pumps take energy from a (relatively) low temperature source and forces that heat through a compressor where its temperature is increased, and transfers its higher temperature heat to the heating and hot water circuits of the house.
There are two main types of air source heat pump systems.


An air-to-water system distributes heat via your wet central heating system. Heat pumps work much more efficiently at a lower temperature than a standard boiler system would. This makes them more suitable for under floor heating systems or larger radiators, which give out heat at lower temperatures over longer periods of time.


An air-to-air system produces warm air which is circulated by fans to heat your home. They are unlikely to provide you with hot water as well.

The benefits of air source heat pumps

  • Heat pumps lower electricity bills, especially if you are replacing conventional electric heating.
  • potential income through the UK government’s Renewable Heat Incentive (RHI).
  • Heat pumps lower home carbon emissions, depending on which fuel you are replacing.
  • no fuel deliveries needed.
  • Heat pumps can heat your home as well as your water.
  • Heat pumps require minimal maintenance .
  • Heat pumps save money.
  • They are cheaper to run than oil boilers and can be cheaper than running gas boilers.