A furnace for under $50?! Imagine the convenience of putting this in your bug out!
Amazingly simple! I can't believe how easy it is to build yourself. Do you have any other DIY projects that you've built to harness solar energy? Share below!
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i filled a black box full of sand/gravel and a 75′ black hose, put a low voltage pump in line, ran it to the pool, on a closed system, almost to warm.