no worries about fire if you use coals only. there's enough heat that you can be a foot or so below the motor and still warm up fine. I haven't had one in 8 years now and never missed a day of work. the bonus is the oil in the sump is warm and gets to the crank 3 times faster than with a coolant heater saving wear and tear on the motor. you just can't be in a hurry,wait for the heat to do the job and you will be running in due time
11 years off the grid and counting