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Installing the ground-source pipes

(Click to enlarge photo)

These are the pipes going into the ground for the ground-source heat-pump (I'm sure I have a better picture somewhere, I'll replace this one when I find it). In my system I have 400 metres of pipe at a depth of 2 metres (the pipes must be well below the frost line). The longer the pipes, the more heat you can take from the ground. There are 6 loops in total, 2 in each of 3 trenches. Each loop is joined onto the next so the water must travel the full length of pipe before in returns to the heat-pump.