I installed the cheap heat system into my 36 foot mobile Suite camper about four years ago and never refilled my two butane tanks yet. This system installs in the gas heater unit and gives you the option to heat on gas are electric. I have a 50 amp service and used the 5000 watt heating coil. This system is heavy duty and very efficient compaired to the gas unit that looses about 40 % to the outside. This system heats the under belly and the inside of the camper evenly. I keep my camper plugged in at my house when not using it and keep it set at 50 degrees all winter. This was the best investment I have ever made to my camper yet. I love this system and would recemend this upgrade to anybody that wants a better way to heat their campers.
Check it out at rvcomfortsystems.com