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Has anyone ever tried something like this http://www.motherearthnews.com/Do-It-Yourself/1977-09-01/Mothers-Heat-Grabber.aspx or this http://blog.hemmings.com/index.php/2007/04/26/almost-free-garage-heat-just-drink-a-lot-of-soda/ I know we have a surplus of cheap do-it-yourselfers (myself...