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Old 06-11-2013, 04:47 PM   #1
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Default Am I boiling off a lot with a 26% boil-off rate?(which means 2.3 gallons in a 60-min)

I have just attached an image of my boil. My question is simple: am I boiling it way too strongly? I boil off about 26% (which is 2.3 gallons) of my batch in an hour....shall I lower the strength of the gas burner? I think my boil looks totally ok. It doesnt look look like the boil of other brewers because I have 2 big gas rings at the bottom of my pot.....with loads of small holes. So it is not a focused fire with a single, strong flame....maybe that's the reason why it doesnt seem to be too strong to me and I leave it at maximum strength.

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Old 06-11-2013, 04:50 PM   #2
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% of volume is meaningless. It's gallons per hour that you should be concerned about.

Anywhere from 1 to 2 gallons per hour is acceptable, depending on what you're looking to achieve.

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Old 06-11-2013, 04:52 PM   #3
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Altitude and relative humidity affect the rate of boil off?

I start my boil at 12.5 gallons and end up with 10.5.

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Old 06-11-2013, 04:56 PM   #4
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Surface area of the kettle will also be a factor. Wide kettles tend to boil off more quickly than tall skinny ones, all else being equal. Mine is the former, 16" wide x 12" deep, and I easily lose 1.5 gallons in a 60 minute boil.

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Old 06-11-2013, 05:19 PM   #5
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i lose 1.5 gallons in a 60 min boil, need 9 gallons total to get 5 gallons into the fermentor.

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Old 06-11-2013, 05:22 PM   #6
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Quote:
Originally Posted by eastoak View Post
i lose 1.5 gallons in a 60 min boil, need 9 gallons total to get 5 gallons into the fermentor.
So, you're leaving 2.5 gallons in the kettle? 2 1/2 hour boil?
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Old 06-11-2013, 05:51 PM   #7
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My average boil off is 1.75-2 gallons with my current boil pot. My old tall skinny pot the boil off was closer to 1.25 gallons per hour.

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Old 06-11-2013, 08:09 PM   #8
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I get mine to a roiling boil as fast as I can and then turn down the heat until it hits a "low boil". I usually lose about 1.5 gallons during the boil.

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Old 06-11-2013, 09:15 PM   #9
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Quote:
Originally Posted by Phunhog View Post
I get mine to a roiling boil as fast as I can and then turn down the heat until it hits a "low boil". I usually lose about 1.5 gallons during the boil.
Thanks for the info. If my flame is not a big, focused one (since I have 2 rings with tons of little holes), then how can I tell that I have reached this so-called "low boil"? I dont actually know what a low boil is. :P
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Old 06-12-2013, 01:13 AM   #10
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Quote:
Originally Posted by Elysium View Post
Thanks for the info. If my flame is not a big, focused one (since I have 2 rings with tons of little holes), then how can I tell that I have reached this so-called "low boil"? I dont actually know what a low boil is. :P
I just get it to the point where the boiling is not explosive but rather closer to a nice "simmer". The whole point of boiling is a) sanitation and b) isomerization of hop acids but that is temperature dependent.
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