How Does it Work?
A mixture of water and anti-freeze is pumped around a ground array (either vertical, left, or horizontal,
below) and absorbs solar energy stored in the ground. Heat is extracted using compression and expansion technology; this heat is then made available to heat the house.
Manufacturers advise that a GSHP can increase the temperature from the ground to around 65°C, but to get over about 50°C the system may require the use of an electric heater (although Kensa’s Shoebox range, for example, can reach these higher temperatures without an electric heater). The hotter the water entering the house, the more electricity will be used, reducing the efficiency of the heat pump. This is why heat pumps are better suited to underfloor heating than radiators.