Memphis,
Thanks for the great project & great write up!
Do you have any concerns about the refrigerant line directly in contact with potable water? (single walled) I see that there are not any connections made in that loop, just copper in/out so the chance for a leak is small. (Nifty way to connect it to the tank too as others have mentioned) I have a desuperheater project and my coaxial heat exhanger is only single walled so I had planned on connecting it through a side arm to effectively make it a double walled equivalent. Maybe overkill, but I already have the side arm.
Len
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