Question; Since I have had some issues with the plastic/copper seal, I was thinking of a different design. Tempted to wrap 1/4" tubing tightly around the OUTSIDE of a 2' length of 2 5/8" Copper. The 1/4" would be my heat pump source and the water would running through the 2 5/8" (metered by ball valves) IF I took that configuration and placed inside a piece of 4" PVC then filled it all with foam insulation, then piped it inline with the Passive Water Heater - what do you think my end result would be? Thanks in advance - advice appreciated
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