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TOPIC: 2 1/2 lb propane tank for stove - cooking time?

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 14:30 #1

  • W8N4SUN
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Our new to us boat comes with a 2 1/2lb propane tank for the stove. For tea kettle or boiling a pot of water for crab cooking...how long does this tank last? For those with the same set up, how many days do you normally get from this tank? When we start doing week long or 2 week long cruises it will be good to know if it will last or if we need to refill during the cruise. Thanks

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2001 3788 w/ 330 Cummins
Seattle, WA

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 14:38 #2

  • Boyd
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There are 91,500 btu's ( British thermal units) in a gallon of propane. To determine how long your supply will last, look at the rating plate on your propane appliance to determine input BTU's and divide that figure into 91,500. The result is number of hours one gallon of propane will supply that unit.
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"Why Naut"
1996 Bayliner 4087
Twin Cummings 6BTA5.9M2
Anacortes, WA

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 15:10 #3

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Boyd wrote: There are 91,500 btu's ( British thermal units) in a gallon of propane. To determine how long your supply will last, look at the rating plate on your propane appliance to determine input BTU's and divide that figure into 91,500. The result is number of hours one gallon of propane will supply that unit.

Excellent, thank you for the tutorial!

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2001 3788 w/ 330 Cummins
Seattle, WA

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 18:39 #4

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There are 21,600 BTUs per pound, so 54,000 BTUs in that 2.5 pound bottle.

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2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 19:12 #5

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SomeSailor wrote: There are 21,600 BTUs per pound, so 54,000 BTUs in that 2.5 pound bottle.


Correct on this point. I read the original post is 2 1/2 gallon (I.e 11#). That would be a much more common size than 2 1/2#.

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"Why Naut"
1996 Bayliner 4087
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Anacortes, WA

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 19:25 #6

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Crap, sorry about the mistake. I meant to say 2.5 gallon tank.

So my crude math adds this 2.5 gallon tank X 91,500 btu = 228,000 btu.

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2001 3788 w/ 330 Cummins
Seattle, WA

2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 19:38 #7

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Correct. Don't count on 2.5 gallons though. Assume 2.0.

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"Why Naut"
1996 Bayliner 4087
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2 1/2 lb propane tank for stove - cooking time? 06 Apr 2017 23:16 #8

  • Nickdixon
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Here's the German engineer answer: weigh it, then use it for an hour, weigh it again and determine amount (weight) used per hour. Go from there. Don't know how many hours per week you would use it...

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