I guess bbp decided not to use these hx coils in his monster solar heat pump water furnace project. If you are looking to buy a hx, that one is the bees knees for what you have planned. Just be aware that you will need a filter before it in your water supply. And I would definitely incorporate temperature and flow sensing in your control scheme. It would be worth the time and money spent the first time it saved the turbotec hx.
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