I'll let OP answer but typically all "4 season" means is that if you run the heater in freezing temperatures, the camper will remain functional. In other words, all plumbing lines are heated/insulated. But yes, you will need to use a lot of propane to heat something like this. Probably close to 10,000 BTU an hour or more depending on the outside temperature and insulation. If the slide is out, and it's really cold out, then you'd probably need more. It looks like this camper has only 2x20lb tanks (would have thought it had 2x40lb). A 20lb tank generally has around 4 gallons of propane in it, so that's 8 gallons total. Each gallon has 91,000 BTU's, so that is 728,000 btu's of fuel. So two bottles of propane in a night? No. But maybe 2 bottles in 2 or 3 nights, depending on water heater usage etc. At night time you can save a lot of propane by turning the heater down to like 55 degrees, and covering up with blankets. Also whenever you leave the camper, turn it down to 55. In that case could see you extending this to 4 or 5 days.
Looking at the propane compartment, it looks like a lot of wasted space. Maybe it is designed to hold up to (4) 20lb tanks. I think that makes sense. OP is that true? If it could hold (4) 20lb tanks that would be really nice.
Looks like a great camper!
