Ground source heat pumps
I am planning a bi-generational house (approx 3000 sq ft) in Québec on an insulated slab with hydronic heating. I want to install piping for the ground source heat pump in the trenches needed for the water pipe from the well, the septic system and more significantly around, under and possibly even in the septic tank. That way I figure I could take advantage of drain water heat as well as the heat generated by the fermentation in the septic tank. Liquid to liquid heat pumps seem to be a rarity. Right now I have a two ton air to air heat pump coupled with an oil fired hot air furnace. The noise of the fan going on is driving me up the wall, even though I purchased the hot air furnace (20 years ago) touted to be the quietest. Air to air or water to air is out of the question. Off the shelf systems don’t seem to exist and my research on the engineering questions I need answered haven’t turned up many answers or people who are willing to consider the idea. If the only added costs to the mechanicals of such a system are forethought, elbowgrease, and pex piping, for COP of 4-5, it should be available.
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