Downhole Heat Exchanger

A downhole heat exchanger, also called a borehole heat exchanger, is a heat exchanger installed inside a vertical or inclined borehole to transfer thermal energy between the ground and a building heating system. It is most often paired with a geothermal heat pump to deliver space heating, and because the technology draws on the steady underground temperature rather than burning fuel, it can meaningfully cut carbon dioxide emissions from heating. Downhole heat exchangers are particularly common across northern Europe, where geothermal heat pump uptake is high.