Quote:
Originally Posted by jamesqf
I think you probably mean a ground-source heat pump, not a true geothermal system. (Though they're often miscalled geothermal heating by merchants trying to take advantage of public ignorance.) A geothermal system works on actual hot water (or rock), such as a hot spring, which I don't think you're likely to find in Finland. (At least I don't recall seeing any.)
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There are a number of different systems like this in Sweden, as I don't really know the names I'll write a short description
Drill a hole about 200m deep into the ground, pump water down to the bottom and warm water comes back up.
Lay a pipe (1 km or so) a meter or so under the ground, and pump water through it.
Lay a pipe (1km or so) along the bottom of a lake and pump water through it.
There is a forth system where a hole is drilled and then instead of water, air is blown down into the hole and the air comming back out is warmed.
I suppose that the best place is find true Geothermal heating is on Iceland, but then it comes at the price of being a little smelly.