Awesome DIY Air Heater! A Survival Off-Grid Air Heater! No Batteries or Electricity is needed! the unit, including the fan, runs on either candles or a liquid fuel (like isopropyl alcohol or ethanol). the "stove fan" generates its own electricity (from the heat of the flame) which runs the fans motor! How The Unit Works... a cast iron pan is placed over a flame (and the pan is quickly heated). next, a heat powered stove fan is placed into the hot pan. the fan then kicks on and distributes that hot air into the living space. it's a great setup! the unit works super! the cast iron pan gets to the same temperature as the top of a typical wood stove (so the fan doesn't know the difference). the fans airflow is 250-360 CFM (that's about the same as a good strong desk fan). i use 2 oz. stainless steel sauce cups to hold the liquid fuel. two ounces will burn for 30 to 40 minutes. note that once the flame goes out - the fan will continue to run for about 15 minutes (as the cast iron cools). i'm getting output air temps of 118F to 120F (48C) when using candles and up to 158F (70C) when using the liquid fuel. the pan temp itself will be 250F to 450F (121C to 232C). max temp was 512F (266C). fan handles up to 662F (350C) and the pan will not get that hot (so it works out good). btw - the pan heated up in 2 minutes and the fan started within 12 seconds of placing it into the hot pan. the fan uses a peltier chip to convert the heat of the flame into electricity to power the motor. the fan i chose starts up at about 122F (50C).

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