Draft PPS18: Renewable Energy
Annex 1 Ground, Water & Air Source Heat Pumps: Water Source Heat Pumps
Water source heat pumps operate in a similar way to ground source heat pumps. The loop is submerged in water, typically a river or lake. They take heat from the water and convert it into a gas. The gas is condensed in a process which releases heat. This heat can be transferred to the heat distribution system in the building. The use of a water source such as a river or lake is likely to provide lower efficiencies due to the temperature of the source being more affected by the weather, but the advantage is the relatively cheaper installation cost achieved by avoiding any ground works. Authorisation may be required from the Department of Agriculture and Rural Development’s Rivers Agency.