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‘You basically have free hot water’: how Cyprus became a world leader in solar heating
(www.theguardian.com)
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I see these things all over Latin America and stayed at a bunch of places that have them. It can get SUPER hot. The cool thing about them is that the pipes that heat the water are vacuum sealed and don't heat the water directly. I forget the exact mechanics of it, but it pretty much doesn't matter what the temperature is. It can take that solar energy and add it to water.
I think they heat a refrigerant and then use a heat exchanger to transfer that heat to the water.