[rohrmann]

About five years ago we were assisting family with medical issues, north of Kansas City, MO, and left there right about now in December. Temperatures were finally warmed up to the lower teens when we left, and because all of our floor heater vents are clear when the slides are in, we ran with the heater on. We stopped for the night somewhere in Kansas, went to get dinner and fuel, and returned to the rig for the night. Unfortunately while we were gone, someone decided they wanted one of our propane tanks, disconnected the hose fitting, but the tank was locked and did not take the tank. The next day, almost to Clovis, NM, we pulled over for a restroom stop, and discovered the heater was not on and the water was frozen, so when we got to the RV park, I told the fellow we needed propane because I thought we were totally out, and that is when we found the problem with the tank being disconnected. When running in sub-freezing temps and your heater vents are clear, the furnace will keep your water system from freezing. We typically turn the furnace off when traveling, but only when extremely cold we will run the furnace.