Bedrock heat pumps
The temperature in bedrock is constant. A borehole is normally drilled to a depth of 70–150 metres, and a collector hose is installed in the water-filled borehole. Liquid circulating in the hose transfers heat from the bedrock to the heat pump. A bedrock heat pump reduces energy consumption by 60–70%.
+ Reliable operation, stable heat source.
+ Suitable for both large and small plots of land.
+ Minimal ground impact.
+ Not visible outdoors (heat pump installed indoors).
+ Can provide comfort cooling.
+ Easy to combine with solar heating.
|– Drilling increases installation cost.
– Permit may be required.