Solar C³ities is an international platform with the intention of providing an open-source virtual Hackspace for "Biogas Innoventors and Practitioners" and training for all those researching, developing and deploying sustainable solutions for flourishing societies.
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have much simpler much cheaper Solar Hot water producer
involves 50 ft black garden hose placed on roof in a back and forth fig 8 attached to roof
and simply allowed to flow into well insulated tank....2hrs of sun produce 150degree water.
real fast real simple