this post was submitted on 30 Nov 2025
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I remember seeing a documentary about a village in Germany, where many houses were damaged by geothermal plants, caused by water entering layers where it usually didn't reach and the material there taking in water and expanding. So it probably depends a lot on the local geology and also on the depth. I sadly don't remember how deep the one in the documentary was.
I know a few people that got geothermal heating installed for their homes (in Germany), which goes a lot less deep than something intended for whole cities or districts. The one at my friend's home is 50m deep, and it looks like anything less than 400m is considered "near surface"