over all a great heater, Was my only source of heat last winter. ran unit out side covered with insulated vent in. tested the co2 out to trailer at a max was on 580. You can smell a little fuel on start up until it fires up and if it shuts down from error like low voltage. Really good for an area 10x20. most of the time it was only at 1 or 2. for about a month while it was below 10°f I turned it up to 5 in the night and 3 during the day. only errors I got was low fuel and voltage, my fault. awsome all in one heater, thank you.