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PopSci Genius Guide solar water heaters solar water-heating Carnett John sun can turn a rooftop burning hot in just a few hours water heaters keep a steady flow plans to put all that heat sheets of aluminum and foam insulation fraction of the cost of commercial flow of piping-hot waterno fuel required heat to work on the roof built a small prototype panel turn a rooftop burning hot
PopSci Genius Guide solar water heaters solar water-heating Carnett John sun can turn a rooftop burning hot in just a few hours water heaters keep a steady flow plans to put all that heat sheets of aluminum and foam insulation fraction of the cost of commercial flow of piping-hot waterno fuel required heat to work on the roof built a small prototype panel turn a rooftop burning hot
