The windscreen issue is something to watch for with cannisters, the dome in the base of the cannister is a pressure safety valve, if this starts doming the other way you are in trouble. I have only ever had trouble with cannisters being too cold though, most of my cannister mounts had a sensible gap, even for frying pan use.the air intake replaces the air, and what little radiation you achieve is never enough. Satelite cannisters allow the cannister to be moved during low pressure closer to the flame