An extremely long time!
The furnace is probably the biggest propane consumer. The water heater can use a lot too (related to how much water you consume).
We rarely cook inside our TT. We use our frig on propane a lot. We use the furnace and water heater a bit each season, and I have never consumed a full 20# tank in a season.
The frig just uses a pilot light to change phases of the ammonia gas. So it is not using much, and it has an electronic ignition, so it is not even on all the time. The initial cool down will be the major consumer, after that it is just maintaining temperature. So if you can precool on electric, you will drop your propane consumption dramatically.
I read somewhere; If the pilot light ran consistently; 1 pound of propane would be consumed every 14.5 hours. Again, there is a thermostat, and auto ignition, so except for precooling, you should get a lot more run time than that, on a pound of fuel.
|