I built a rocket mass heater in my garage a year ago. It is the most efficient and pleasant way to heat a space. It saves huge amounts of energy by utilizing the laws of thermodynamics to utilize nearly 100% of the heat generated from the fuel. I use scrap wood in my rocket heater so my fuel is free and it is supercharged with a computer fan that uses less than 74 cents of electricity per year. I love it!

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