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What Ive seen of solar roof systems. The diameter of the pipe is fairly small(like 1/2" or 3/4"). The systems circulated the water into a large storage container on the groung (usually wrapped in insulation). The smaller diamer pipe was used because the lower volume of water had time to heat up by the time it made its way through the piping. With large diameter pipe, the water must be incredabley slow to give time for the water to absorb the heat. There are many great books on the subject and even energy fairs(Oregon has one) each year.
 
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