I have a quote in for a 4 ton WTA and 3 ton WTW unit to heat / cool the house I will be building. The quote included 900' trench with a 6-pipe configuration.
Seeing how I have a backhoe, and I've done numerous PEX systems, I was considering tackling the ground loop installation. I've read some good information on this forum, and climatemaster has an excellent manual for installation design and information.
While I'm not opposed to fusing HDPE pipe to my header, I was thinking about the following installation:
4 pipe trenches - they go out about 300' and come back 300'. Hence, I could use standard 600' 3/4" HDPE pipe, and get both ends into the utility room. This would eliminate any underground splices, and my headers would be inside, and similar to a PEX radiant floor system header.
I would go with (8) 600' loops, for a total of 4800' in piping.
Any experienced installers see an issue with the headers inside the building vs. in the ground?