[Jake] built himself a solar water heater. The system has an 82 gallon insulated water tank and uses a solar collection grid made of PVC pipe. As the water heats, it rises to the top of the collect… ...

Retired mechanic Jose Alano invented a simple, cheap, energy saving rooftop solar water heater which is benefiting thousands of people ... 2L plastic bottles (60), cartons (50), 100mm PVC pipe (70 cm) ...

You’ll need two water bottles, some thin PVC pipe, and a way to attach the bottle’s caps together (they use hot glue.) Stick the caps together, then drill a hole through them both.