Hi, I'm Alan and am a new member. I came across this site during a search on the internet trying to find info on a Duo-Therm 65512-03 furnace in my 75 Prowler camper . I haven't found much for it yet. It heats up very poorly and intermittently. It works off a thermopile generator so no electric is required. The generator is new. (I got it last summer - what a chore to get the correct one). But, It or the thermostat might be wired incorrectly. There is no fan for this furnace. Any help is greatly appreciated.