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Solar Water Heater

From The Urban Farming Guys Sustainable Technology WIKI
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Retired mechanic in Brazil, Jose Alano, invented a rooftop solar water heater with plastic bottles.

http://www.theecologist.org/how_to_make_a_difference/climate_change_and_energy/477574/how_to_make_a_solar_water_heater_from_plastic_bottles.html