Except for those connections, it sure 'seems' like a good fit for a 2-ton ASHP water heater.
I was thinking that 1" MPT Screw-on Flare adapters for the 1/4" & 5/8" OD lineset,
might work for R290, and maybe even R410A..
It seems like a heating only app would not require "very large temperature cycles".
What if the HX was always kept above 40F, to avoid freeze damage,
and the maximum upper range was 120F to 170F ..?.
(How high does your Sanyo go)??
This seems very close to the normal temp range, of my current forced hot water baseboard system..
The largest extremes might occur during the Defrost cycles.
Depending on the way it was implemented.
If Propane was used, (outdoors of course) and the threads leaked a little,
I have to wonder if it would be a big deal, topping-off the charge once in a while.?.
Design pressure 3.0 Mpa (435 psi)
Test Pressure 4.5 Mpa (650 psi)
Design Temperature -195°C to +220°C (-319°F to 430°F)
Refrigeration Capacity 5-25KW (17,000-85,000 BTU/hour)
Applications:
SVO conversions, Heat pump system, household type central air conditioning,
after heat recycling, refrigeration equipment, industry cold water machine,
cooleroil and so on
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