Can you build your own solar thermal panel for under $5? The guys at the The Sietch group say you can. They gives you step-by-step on how to build one yourself. You'll need the back grill of a fridge, a floor mat, some window glass, tape, tubing, and foil. Put it all together and you’ve got a pretty efficient water heater — over 110 degrees on sunny days. They also show you how to make a thermo siphon. Great for heating a pool. :: Via Groovy Green
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