I to are looking at a better source of indoor heat. I now use 110 volt baseboard heaters. But with the two heater I now use and the limited power we get at CG it alway a strain on the power need of the trailer. Here is a good article about heaters I'll show part of the story
Comparing Costs of Electrical and Propane Heat
One gallon of LPG (Liquified Petroleum Gas - the more accurate name, since what we usually call propane is actually a mixture of propane, butane, and smaller quantities of assorted other similar gases) contains about 91,500 BTU of energy, depending on the exact mix of the various gases. Since propane heaters have an efficiency ranging from perhaps 50% to 90% (I'll use 80% in this calculation), the useful energy content is approximately 73,200 BTU, which is 21.44 kilowatt-hours. (1 KWH = 3414 BTU).
Thus, if electricity costs $.10 per KWH, LPG would have to cost $2.14 per gallon in order for the cost per unit of energy to be the same for the two sources.
Simply multiply the cost of a KWH of electricity by 21.4 to determine the cost of propane per equivalent amount of heat energy. (This is a compromise number. For a traditional propane furnace, use 17.42 (assumes 65% efficiency); for a catalytic heater, use 24.12 (assumes 90% efficiency).
Some campgrounds have electricity included in the cost of the campsite, but charge an extra $2.00/day for use of an electric heater. To determine whether to use electricity or propane in this situation, you have to know in advance how much heat you will need each night. For example, if you ran a 1500-watt electric heater continuously for 10 hours, you would use 15 KWH at a cost of the $2.00 surcharge, or $.133/KWH. If propane costs less than $3.22/gallon, it will be more economical to use a catalytic propane heater (or $2.32 for a conventional furnace).
Heres the full article:
http://www.damouth.com/RVStuff/PortHeat.shtml