Yup, I agree with your math....
Originally Posted by MedSailor
One more quick propane question regarding the dickinson stoves.
1 gallon of Propane ~= 4.23 lbs ~= 91690 Btus
1 lbs of Propane ~=21,676 Btus
20 lb tank of propane holds approx 4.73 gallons of propane (433,694 BTUs)
Then for the dickinson 9000model if you run it at 5500btu/hr you should only get 78.9 hours of usage (433,694/5500 ~= 78.9) yet the dickinson website claims 140hrs at this rate.
For the high setting of 7500btu they claim 100hrs though 433,694/7500 yields 57.8hrs by my math.
What gives? Surely a pound of propane can't produce more than 22000 btu. So does the stove not run as long as they say, does it not put out quite as many btu as they claim, or am I missing something else? I'm hoping that I'm missing something as I'm actually sold on the idea of a dickenson 9000 for a forepeak heater on my boat if their numbers are indeed correct.
... and it matches my expereince. Of course, if you turn the heater off now and then, which you will, it runs much longer.
My installation notes:
Sail Delmarva: Search results for "let there be heat"
The fan is a bit loud on high, but it doesn't need to be on high. You will need a rope deflector/cap guard.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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Last edited by pdqaltair; 03-08-2010 at 07:07 PM.