How much propane would a burner like this use?

I need to buy a larger pot to do AG and for the price of a pot, I could just about get a cajun cooker like the one below

Amazon.com: Bayou Classic 3066A 30-Quart Outdoor Turkey Fryer Kit: Home & Garden

How much propane does something like this burn while boiling six or so gallons of wort for an hour or so?

I get 4-5 batches from a propane canister with that burner. It burns for around 2.5-2.75 hours per batch as it heats the sparge water during most of the mash and then runs at a very low setting during the sparge (I fly sparge) so that at the end of sparging the boil kettle is close to boiling and finally maintains a vigorous boil for 60-90 minutes depending on the recipe.

ONE POUND of propane will produce 22k BTUs...

So it isnt really the SIZE of the burner that matters... the larger the burner, the more you have it throttled back. Now if you run a larger burner wide open the entire time, your poor little tank will be dry in no time.

I think that most people see about 4-5 brew sessions out of a single 20lb tank, but have a full spare on hand for pete sake.

This one has a 55,000 BTU burner, so you could run it WIDE OPEN for about 6.5 hours! This is because a 20lb tank holds about 16.8 pounds of actual propane.

If you dig around, your Local Ace usually have a filling service, and you will get a 20 gallon refill. Costs about 16 bucks.

The Pol said:

I think that most people see about 4-5 brew sessions out of a single 20lb tank, but have a full spare on hand for pete sake.

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+1 Running out of propane in mid boil is a royal pain in the ass.