Ground Source Heat Pumps (GSHPs) use the earth's relatively constant temperature to provide heating (and sometimes cooling and hot water) for buildings. Even in the relatively cold winters of the UK the ground temperature is sufficient for good GSHP systems. The most suitable means of heating buildings using Ground Source Heat Pumps is by means of under-floor heating to maximise the efficiency of the system.
Ground source heat pumps operate on the same principles as a domestic fridge. The ground temperature is around 10°C, the same as the inside of a fridge. The under-floor heating system runs at roughly 40°C the same as the warm grille found at the back of all fridges.
Air Source Heat Pumps (ASHPs) can be viable in areas where there is no mains gas.
Although not as efficient as GSHPs due to the fluctuating air temperatures.
Fluid circulates through the outside of the ASHP unit which then returns to the inside unit warmer. It can then be used to provide low temperature heating.
As the electricity grid gets cleaner and more renewable electricity is brought on line, so the carbon emissions from the heat pumps fall. There are no flammable fuels or tanks, no flue, no pilot light and no toxic exhaust gases. There are no road miles from biomass, LPG or oil tanker deliveries.