1 gal = 3.78 liter 1 Liter = 0.26 gal
0235849056 (or so) lbs / 4.24 (lbs per gallon)
1 gallon = 4.2 lbs33lbs / 4.2lbs = 7.86 gallons
Commercial propane weighs about 3.696 lbs per gallon. So a 25 lb tank would be around 6.764 gallons.
Depends on the size of the burner, if the unit is 5000 btu's ,( probably much smaller), but it makes the math easy that would run a fridge (full throttle) for 20 hours. The flame cycles, so it won't...