I second a small rocket stove, you will be amazed at how much heat they put off..
mine has a 80k btu house heater updraft just had to run the gas line and bend some sheetmetal make a stand and run the exhaust.. .. the idea of propane and moving it later works...use a thermostat and try to get something that moves the air around it makes a big difference..
I keep mine at 50F and turn it up when i go out to work, it only takes one cup of coffee (never timed it just finish my coffee) and the shop is warm... much nicer to work on stuff that is 50F when its 15F outside...
mine has a 80k btu house heater updraft just had to run the gas line and bend some sheetmetal make a stand and run the exhaust.. .. the idea of propane and moving it later works...use a thermostat and try to get something that moves the air around it makes a big difference..
I keep mine at 50F and turn it up when i go out to work, it only takes one cup of coffee (never timed it just finish my coffee) and the shop is warm... much nicer to work on stuff that is 50F when its 15F outside...