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Home Brew Forums > Home Brewing Beer > General Beer Discussion > Why 1.5x the boil for a brewpot?
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Old 07-12-2012, 03:12 PM   #1
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Default Why 1.5x the boil for a brewpot?

I see on sites like Blichmann and others that a brewpot is recommended to be 1.5x the size of the boil. Why is that? Is that just to minimize boil-over? Or is there a hop utilization dealy-o? I usually boil 11.5 g in my 12 g pot and have no problems with boil-over. Of course, I watch the pot like a hawk and stand ready on the regulator with a spray bottle. But I've had exactly one boil-over in over 20 batches brewed. So why the much bigger pot recommendation?


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Old 07-12-2012, 03:17 PM   #2
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I boil 13g for a 10g batch. I suppose I could squeeze that into a 15g pot (and I have) but with a rolling boil the volume increases some and then instead of prepping the rest of the stuff I'll need post boil I have to sit in the hot sun for over an hour staring at the kettle. 20g is a nice comfy fit for a 13g boil, and even with that I've had boilovers.


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Old 07-12-2012, 03:26 PM   #3
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Some of it has to deal with hot break and some it has to deal with pre-boil volume.
Better to be safe than sorry...

I brewed up an American Wheat AG last night and my hotbreak was monstorous to say the least. I collected 7 gallons in my 15.5gal Keggle Brewpot after Mash out and once the temp got up to boiling my hot break was nearly to the top of the keggle brewpot. Sure glad I had the extra room on top to hold it all without boiling over and creating another mess in my garage.

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Old 07-12-2012, 03:40 PM   #4
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I could have used a bigger pot the other day. I ended up 3/4" from the top edge before I started boiling it. I don't know how but managed to not have a single drop go over the edge. My 8 year old daughter looked at it and said "Daddy. That way too much, it's going to bubble over!" She was all upset about it.
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Old 07-12-2012, 03:42 PM   #5
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F E R M C A P - S

I boiled 10.5g in a 12g keggle last brew. Never had the slightest inkling of a boilover. It's magic.
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Open log Fermenting and gas-can secondary?? I am planning my next brew right now!!
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Old 07-12-2012, 04:05 PM   #6
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Originally Posted by tre9er View Post
F E R M C A P - S

I boiled 10.5g in a 12g keggle last brew. Never had the slightest inkling of a boilover. It's magic.

Why more people don't use this product is beyond my understanding.
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Old 07-12-2012, 04:08 PM   #7
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F E R M C A P - S
+1 Not having to babysit a boil (or a starter) is priceless.
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Old 07-12-2012, 04:17 PM   #8
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I'm seriously considering doing 10g. batches (I just did a 9 that ended up 9.5) in my 12.x gallon keggle. You'd think 0.5g (11.5g boil) isn't much space but with Fermcap, it's at least workable.
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Old 07-12-2012, 04:22 PM   #9
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I guess what I'm getting at is, is there any reason you couldn't do a 1.5bbl boil in a 55 gal pot?
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Old 07-12-2012, 04:27 PM   #10
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Why more people don't use this product is beyond my understanding.
I didn't even know this existed until now. Does it have any effect on head retention?


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