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Old 11-18-2009, 12:29 AM   #1
DavidSteel
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Default Rolling boil vs. regular boil

I was wondering what a rolling boil achieves that a regular boil doesn't.

I'm using a 7.5 gallon turkey fryer (aluminum) on a stove top.

Will boiling an additional 15-30 minutes make up for what a rolling boil does to the beer?

Is there another way to make up for it, such as stirring frequently?

Thanks in advance

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Old 11-18-2009, 12:48 AM   #2
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A boil is a boil as far as I'm concerned for hops, wort, etc.
A roiling boil allows for more surface contact to allow for faster evaporation is the only difference I know of.

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Old 11-18-2009, 12:52 AM   #3
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A wise brewer once told me, "a boil is a boil." If you get it to 212 (or whatever it is based on your elevation) and it is bubbling, then you are golden.

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Old 11-18-2009, 12:52 AM   #4
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A rolling boil is all that is needed. You don't need the wort leaping out of the kettle during your boil. Actually a very hard boil will cause more melanoidin formation and potentially throw off the intended flavor of your beer. You need convection not a tsunami.

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Old 11-18-2009, 12:52 AM   #5
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The boil does so much more than just evaporate water:

Hop Utilization
Precipitates protiens
Improves head formation
Drives off DMS

Etc...

This is sort of like asking, "can I get a ticket for driving fast?"

How fast is fast? What is the speed limit? Some things have to be quantified.

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Old 11-18-2009, 12:53 AM   #6
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I believe a rolling boil may aid in making clearer beers.

Pretty sure that was mentioned in the Brewstrong Podcast on Chill Haze.

It's also fun to watch a rolling boil.

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Old 11-18-2009, 02:57 PM   #7
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I'm guessing it helps break down proteins and the like, but can one get closer to what a rolling boil does by string vigorously?

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Old 11-18-2009, 03:01 PM   #8
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Quote:
Originally Posted by DavidSteel View Post
I'm guessing it helps break down proteins and the like, but can one get closer to what a rolling boil does by string vigorously?
Boiling is boiling- when the big bubbles roll over and break and do it again. Anything less is a simmer- not a boil. A boil is required to do those things the Pol listed.

So, no, you won't get the same results with stirring or anything less than a boil.
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Old 11-18-2009, 11:39 PM   #9
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There was a discussion regarding the concept of "boiling" on a brew strong show. I remember the conclusion was that as long as the surface of the water is moving, then you are boiling.

Aside from melanoidin formation etc (actually, I just remember that it was the melanoidin Brew Strong where I heard the above discussion...), the more you boil the more you evaporate and waste propane (if your using a burner). For a while I was turning my burner up to max and the thing was boiling away like crazy - and my evaporation rates were about double what is considered normal. In the end an overly zealous boil is nothing more than a wasteful inconvenience.

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