A geothermal well will vary in depth depending on the ambient temperature of your location, ranging anywhere from 6 to over 200 feet. It needs to be deep enough to avoid freezing at the surface, while accounting for cost in the installation process. In many parts of the world, that’s as little as 4’ deep. Even in very cold climates, soil that maintains a steady temperature of 50°F through the seasonal cycle is typically found around 10’-12’ deep.
Geothermal wells depend on the underground aquifer or river. It must be deep enough underground to provide the necessary heat, and the water supply must be steady and readily available.
