Ok, so to answer DonT's questions directly:
1. A 11KBtu compressor feeding a hydronic HX would probably not heat his barn-home during frigid weather, even at 130 degF supply water temperatures.
2. A GSHP would probably not be highly efficient running against a 175 degF water-heater-turned-boiler. It may save some electricity in the long run, but would have a relatively short lifespan.
3. The staple-up (or similar) hydronic heating loop would be much less efficient running at 130 degF than 175 degF, and would seriously reduce heating capacity of the system as a whole. MMT and BBP have discussed this at length in the DIY hydronic heating thread.
Go fish.
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