This is the solar hot water heater I want to build when I get back to Guatemala. Hotel Playa Linda first.
http://youtu.be/ehDgXrpRlTU
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This self-built solar water heater is made of plastic bottles, black painted milk cartons and PVC pipes. It is popular in southern Brazil.
The water is heated passively by solar energy. As the hot water rises, it is naturally replaced by cold water, so no pump is needed.
Construction reference:
http://www.youtube.com/watch?v=c-Y5AwFuTGU
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