I have an '84 Palomino with the hydroflame 8012 furnace. Everything works well, but the fan is pretty noisy and I'm also always looking to reduce power usage anywhere i can. According to the manual, this furnace draws 1.6 amps. I'd love to have one of the old fanless style heaters, but they seem to be pretty rare. My dad said he had one in a camper long ago and he loved it. I actually tried running my furnace without the fan by bypassing some of the safety switches. The flame died out pretty quickly and i realized that there are actually 2 fans in the furnace, the larger one blows air past the heat exchanger and into the camper, but there is a smaller one that actually circulates the intake/exhaust combustion air from outside the trailer. So when that smaller fan wasn't running, the flame died down and went out. 12v computer case fans run extremely quiet and low power. I think they run around .1-.25 amps. I know they don't push nearly as much air as the fan in the furnace, but that that might be ok if it can run more of the time without being obnoxious and draining my battery. I'm wondering if i could put one or two larger case fans for the cabin air circulation, and a smaller one for the combustion air circulation. Has anyone ever tried this?