How long does a standard 20 lb. propane tank last?
On average, the Q20 Low Pressure Burner will run for 15 hours on a 20 lb. propane tank when turned up, while the E53 High Pressure Burner will run for 4 hours on a 20 lb. tank when turned up fully. Keep in mind you usually back off the gas after the wort begins boiling, so your fuel consumption will probably be quite a bit better than these figures.