HyenaCheeseHeads t1_iqslohr wrote
Reply to comment by arfbrookwood in Shocked by gas bills, thrifty Dutch stockpile coal, wood for winter by clampie
Ground source = around 1m below the surface. Uses the average temperature of the subsurface layer (around 15C) as source of heat
Geothermal = around 100m+ depths. Uses geothermal energy from the earth's core (or hot springs, geysers, volcanic hot spots)
arfbrookwood t1_iqtanhd wrote
Air source is not below ground at all. That’s what I’m talking about.
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