Lwiddis wrote:
One gallon of propane weighs 4.2 pounds. A "full" 20 lb cylinder should have 4.7 gallons of propane in it which translates to about 430,000 BTUs. Dividing 430,000 by 58,000 BTUs burned per hour gives us 4.7 hours on one bottle of that size. I also balance checkbooks but charge for that basic arithmetic.
430/58=7.4 hours not 4.7 hours. probably dyslexic typing!
Now, at full draw, what I will say from experience is the last gallon is going to be a lower output. as the propane boils away it cools down and 58K draw from a 5 gallon tank will start to have reduced output with around a gallon left. You will see the flame go down.
but figure a good 6 hours at full output, on medium 10 hours or so.
