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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Boil off?
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Old 05-01-2011, 01:31 PM   #1
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Default Boil off?

I wasn't sure where to post this, so I posted it here since it affected my efficiency calcs.

I did a no mash out, no sparge brew yesterday, it was a half batch and I had about 3 gallons go into the boil. I swear out of the boil I was far less than 2 gallons. My OG into boil was 1.039 and out of it 1.060 if that tells you anything.

Beersmith has 9% boil off per 60 minutes.

I boiled off maybe 30%.

I'm confused.

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Old 05-01-2011, 01:58 PM   #2
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Originally Posted by petep1980 View Post
I wasn't sure where to post this, so I posted it here since it affected my efficiency calcs.

I did a no mash out, no sparge brew yesterday, it was a half batch and I had about 3 gallons go into the boil. I swear out of the boil I was far less than 2 gallons. My OG into boil was 1.039 and out of it 1.060 if that tells you anything.

Beersmith has 9% boil off per 60 minutes.

I boiled off maybe 30%.

I'm confused.
I always boil off about 1.5 gallons in the winter, about 1.0 gallons in the summer. How much do you typically boil off?
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Old 05-01-2011, 02:02 PM   #3
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After playing with some numbers it dawned on me boil off should be measured in volume and not percentage.

Beersmith has 9%, and I'm assuming that's for 10-gallon batches, so I changed it for
18% for 5 gallon batchs and 36% for 2.5 gallon batches. That math looks better.

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Old 05-01-2011, 02:04 PM   #4
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Originally Posted by petep1980 View Post
After playing with some numbers it dawned on me boil off should be measured in volume and not percentage.

Beersmith has 9%, and I'm assuming that's for 10-gallon batches, so I changed it for
18% for 5 gallon batchs and 36% for 2.5 gallon batches. That math looks better.
I noticed that in Beersmith it has a %, but you're correct- it should be the volume and not a percentage. If you're using the same pot in the same climate, you'll boil off the same volume no matter what the batch size.
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