Warm a Room with Only a Candle and a Few Terra Cotta Pots - Survival Life: "The terra cotta pots concentrate the heat using convection. While you won’t heat a whole house with it, it can definitely warm your hands and make a cold night much more bearable with this method. Several of these going at the same time can comfortably warm a room. You can purchase one of these and see just how they work from http://www.heatstick.com; or you can make your own for just a few bucks."
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