Hello randen, When you write "the ground loop is 600 ft for each ton," what sort of 600 ft do you mean? What width of trench, and what configuration of pipe in the trench? Straight pipe side by side or separated by the width of the trench or above and below? Half, third or quarter pitch slinky if slinky at all. Is the 600 ft the length of the trench or the length of the pipe in the trench. I'm thinking of the bore hole style where you may have a 200 ft deep hole, but you'll end up with 400 ft of pipe. A half pitch slinky in a 3 ft wide trench might take 12-13 ft of pipe to travers 18 inches of trench including the return pipe. The number of ways the source pipe can be installed is a little challenging.
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