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Old 08-07-2012, 10:56 PM   #1
Aug 2012
Pittsburgh, PA
Posts: 5

Hello all...this is my first post...

I just collected 7G of wort from an all-grain brew....boiled for 90min....at end of boil, I was shocked to see that i was down to around 3G of wort! My boil was pretty intense, but I'm still shocked that I could boil off this much wort in90min! I was expecting around 1.5G boil off....not nearly 4!
I'm sure I could look this up in a chemistry book, but I thought you fine people would be a better way to go. Any thoughts? Am I existing outside the laws of thermodynamics?

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Old 08-07-2012, 11:10 PM   #2
NervousDad's Avatar
Jan 2012
City of the Steamer
Posts: 1,256
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I boil off 2.5+ in the winter for a 60 min boil, so I'd say that's pretty accurate if you had an intense boil. The average I would guess would be around 1.5 gallon an hour.

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Old 08-07-2012, 11:13 PM   #3
worksnorth's Avatar
Apr 2011
Soldotna, Alaska
Posts: 684
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Did you use lot's of hops too?

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Old 08-07-2012, 11:17 PM   #4
Nov 2011
Nevada, MO
Posts: 245
Liked 11 Times on 11 Posts

Dude, turn the heat down. You want your boil off rate to be between 12-15% per hour. You just need a rolling boil not one that jumps out of the pot.
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Old 08-08-2012, 03:11 PM   #5
TopherM's Avatar
Mar 2011
St. Petersburg, FL
Posts: 3,976
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What pot do you have? Boil off rate is directly proportional to the surface area of the wort, so proportional to the diameter of your pot.

I boil off about 1.5 gallons in 60 minutes in a pot with a 13.5" diameter. If you are anywhere close to the same diameter, then you may be measuring incorrectly....
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