Heating a room or a greenhouse can become expensive quickly. This sand and copper powered heater can heat for days using a vegetable shortening double or quadruple wick candle. Temperatures can exceed 500 F or 273 C for extended periods of time. This heater is easy to set up and cost less than $20 for most of the materials needed. I’ll show in detail how to assemble and add safety features to keep your sand heater safe and running efficiently.
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Credit to : Zen Garden Oasis