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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Low Post-Boil Volume / Higher OG Question
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Old 01-14-2011, 07:01 PM   #1
Shepherd5
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Default Low Post-Boil Volume / Higher OG Question

My post boil volume yesterday for a 5 gallon batch was around 4.5 gallons, and my OG was 1.080, instead of the 1.072 target as listed on my recipe directions. I sparged with the amount of water the recipe instructions called for, so I think the reason for this is because my boil pot is 15 gallons and I am getting alot of boiloff. Should I, now a day later, consider adding some additional water to my fermenter to bring the volume up to 5 gallons? Or, should I just call it good and let it stand as is? Will this affect to finished flavor, etc.?

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Old 01-14-2011, 07:55 PM   #2
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what was the volume before the boil? how long was the boil? and personally I'd leave it as is and just enjoy the beer you made..

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Old 01-14-2011, 07:58 PM   #3
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Probably fine to just leave it. But what style beer is it? Your bitterness might be a bit higher than planned, so if it is lightly bittered you might want to dilute it to get the right balance. If it's something like a big IPA or APA, don't mess with it. The extra bitterness (which is probably minimal to begin with) will probably not be noticed and the extra ABV will onyl help!

I had efficiency problems on an English pale and had to boil off a bunch to get the same OG, around 3.75 gallons instead of 5. I didn't think to adjust the hops and it is certainly more bitter than it was supposed to be. But it's a good thing I like hops, the beer is still very good.

EDIT: Probably best to wait until fermentation is fully done to think about dilution. If you still get close to the recipe's FG, best to leave as is.

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Old 01-14-2011, 09:06 PM   #4
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The beer was the AHS Pliny Clone. Preboil volume was 6.5 gallons, and the boil time was 90 minutes. I am surprised that the recipe directions didn't seem to account for the longer boil, unless 1.5 gallons boiloff is typical. Maybe my larger 15 gallon pot makes a difference.

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5.) Blichmann Top Tier Burner
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Old 01-14-2011, 09:27 PM   #5
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in my 10 gallon pot a 90 minute boil will boil off 1.5+ gallons.. 6.5 gallon is what I use for a 60 minute boil. that's so I end up with 5.5 gallons (to account for the trub loss after fermentation)

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Old 11-06-2011, 04:19 AM   #6
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Curious if you have any updated (consistent) measures on boil-off volumes? I am searching/asking because I did my first 15 gallon AG today and I lost 2.5 gallons in an hour! This is a Polar Ware 15G which has a wide surface area. Also it was 40 degrees and 90% humidity.

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