I think the main different between solar HOT WATER heaters up north and here is the ones I saw up north were in INSULATED enclosures, glass front, and insulation on the back, the systems I see here are just black tubing on the roof, and in cold weather I am guessing you lose a lot of the heating due to the lack of insulation and enclosure. In any case I tend to agree with above comments, as I saw my neighbor had theirs removed recently. It was installed by previous owners and was about 8 years old.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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