Looks like a great project. Putting the two coaxial Hxs in parallel cuts the heat exchanger resistance in half. Good thing as a lot of the total system resistance is in those helical/spiral exchangers. Allows use of a smaller pump and less cost to run it.
Would get double the amount of BTUs from the incoming water stream.
Water tank?
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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