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Old 09-26-2011, 11:07 PM   #1
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Default Can this boil-off rate be right?

Wow! I have a new 10 gallon Mega-pot from Northern Brewers. (Really nice pot, by the way). Before brewing my first batch with this pot, I decided to check what the boil-off rate is with it. I brought 5 measured gallons of water to a rolling boil (not an aggressive boil)and started my timer, set to 60 minutes - uncovered. When the timer indicated 60 minutes was up, I cut the heat, and cooled the water to about 90° with my immersion chiller. I then measured how much water was left. Surprise! Only 3 and 1/2 gallons left! Seriously?
Anyone else getting this high of a boil-off rate?


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Old 09-26-2011, 11:16 PM   #2
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That's about what I get for boil off.


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Old 09-26-2011, 11:33 PM   #3
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I boil off a gallon each 1/2 hour. So after an hour I would have only 3 gallons left. Your fine.
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Old 09-26-2011, 11:51 PM   #4
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Seems alright, start with 7 gallons and get 5.5 out
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Old 09-26-2011, 11:54 PM   #5
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I would say that 1.25-1.5 gallons per hour for a boil off is about right for most of us! Remember that boil off is a function of pot width and heat (and humidity- those in the desert boil off more than in Miami, for example), and not volume. So, if you start with three gallons, you'll boil off 1.5 gallons. If you start with 9 gallons you'll still boil off 1.5 gallons!

For a 5.5 gallon batch, 5.25 gallons to the fermenter, I start with 7 gallons in the winter, and 6.5 gallons in the summer (on humid days, I boil off less).
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Old 09-27-2011, 12:08 AM   #6
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I lose right at 1/2 a gallon when I do a brew but I am only boiling 2.5 gallons instead of 5. Bigger pot would have more surface area for the water to release steam. I'm sure if I doubled my pot size I could expect the same to happen with my boil off.
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Old 09-27-2011, 12:13 AM   #7
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I have a 10 gallon boil kettle and boil off just under 1 gallon per hour. But, it is what it is. You were smart to test it with water first so you can adjust your wort volume accordingly.
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Old 09-27-2011, 12:21 AM   #8
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Quote:
Originally Posted by Cimerian View Post
I lose right at 1/2 a gallon when I do a brew but I am only boiling 2.5 gallons instead of 5. Bigger pot would have more surface area for the water to release steam. I'm sure if I doubled my pot size I could expect the same to happen with my boil off.
I would say it has more to do with the power of the burner/element, you put X amount of energy into the wort and that energy will convert X amout of wort to steam. Although the size of the pot comes into it because a smaller pot requires a smaller burner/element to be functional
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Old 09-27-2011, 12:28 AM   #9
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I only boil off about a gallon per hour, but my stove is underpowered, and I keep the lid half-on to maintain the boil, so I lose less.

(Until next time - I just insulated the damn pot. Stupid aluminum and its high thermal conductivity.)
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Old 09-27-2011, 12:33 AM   #10
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Quote:
Originally Posted by jcdouglas View Post
That's about what I get for boil off.
Quote:
Originally Posted by Hammy71 View Post
I boil off a gallon each 1/2 hour. So after an hour I would have only 3 gallons left. Your fine.
Quote:
Originally Posted by mattd2 View Post
Seems alright, start with 7 gallons and get 5.5 out
It sounded like a lot to me, but I guess I'm not alone. Glad to hear that.

Quote:
Originally Posted by Greyhound View Post
You were smart to test it with water first so you can adjust your wort volume accordingly.
It happens once in a while - the me being smart part.
Thanks for the replies.


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