Wow, only $160 for a 3T HX. Which model are you referring to.
I have an old Copper Solar Flat panel HX that is 7' 9" X 34", Basically 23 S.F. I use it for hydronic heating and cooling in the living area. If I had to buy the 3/8" copper tubing to make a similar panel, then add the copper sheeting between the tubes, I think my estimate was something like $500 for just the copper materials, I got 3 of them from a recycling center for $200 EACH a couple years ago, when copper was lower in price, they weigh about 50-60 Lbs a piece. I think they were OLIN Flat Panels, I don't have any parts from the rest of the panels, it was all aluminum and I scrapped it this year.
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