I setup my camper and turn the hot water heater on using the propane setting. I left the camper and came back and could smell something hot/burning inside the camper. I looked at the rubber propane line connected to the hot water heater was on fire. I opened the cover to the hot water heater and blew the flame out. Propane was leaking from the rubber line that was cracked. I turned the gas off to prevent additional fire. The gas line appeared to by dry rotted. The camper would have burned if I didnt catch the line on fire. The line was replaced, but should have been a better line. I made the repair myself and did not report it to the manufacturer or anyone. There was no warning of the fire until I bought the fire outside.