jdc1 wrote:
Average RV heater uses about 1/3 gallon of fuel an hour. 30* weather? More than that. A 30 pound tank is 7 gallons. Expect only 14 hours out of a tank in those conditions.
We had our 28ft 5er in -5F and only went thru a 30lb tank per day. The furnace was running 24/7 (well actually we left around day 3 when the roads were clear).
Does the furnace run continuously at night or does it cycle? At 30F, I would expect it to cycle on and off and you should get much more duration than 7-10hrs out of a tank.
I'm betting on a leak. If the propane doesn't run out unless the furnace is on, check for a leak in the feed to the furnace.