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  A Solar-Powered Boiler

Why use natural gas or oil to heat your home's water supply when the sun can do it for free? The big boiler in the sky lays down 100 watts of power across a single square foot. The simple solar-powered hot-water system that I' ve built from scratch will put these free watts to work on the rooftop of my new eco-conscious home. Read more...

Source: Popular Science Magazine, August 2009

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