What if my plot is too small or too rocky to install trenches for the ground loops?

There is an alternative. You can have boreholes dug which need to be about 100 metres deep. If the ground is not rocky but just hard you can dig longer, wider and shallower trenches, as long as they are at least 1.2 metres deep. The ground loop coils will need to be laid horizontally in a different configuration.

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