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Old 08-22-2008, 07:00 PM   #1
bkov
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When doing full boil extract brews, is it better to leave the lid on or off? thanks

 
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Old 08-22-2008, 07:03 PM   #2
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I've always been told you should never leave the lid on during a boil as one of the benefits of the boils is the boiling off of a lot of things you don't want in the beer. If you leave the lid on, the steam will condense on the lid and drip all of those nasties back into your beer.

Lid off
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Old 08-22-2008, 07:08 PM   #3
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Lid off, natrually. Helps to eliminate DMS.

 
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Old 08-22-2008, 07:11 PM   #4
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I always boil lid off. Sometimes, if brewing outside, or around my shed-heavy dogs I will put a towel over the pot.
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Old 08-22-2008, 07:22 PM   #5
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Keep in mind that for an extract brew it has already been boiled so that the DMS should be gone. I'd boil with the lid off anyway just to ensure that any more that is generated is driven off, but I don't think it's as critical as with AG.
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Old 08-22-2008, 07:23 PM   #6
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It'll significantly help avoid boil-overs too...
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Old 08-22-2008, 07:24 PM   #7
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It'll significantly help avoid boil-overs too...
My thoughts exactly! Off.
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Old 08-22-2008, 10:14 PM   #8
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Quote:
Originally Posted by Fingers View Post
Keep in mind that for an extract brew it has already been boiled so that the DMS should be gone. I'd boil with the lid off anyway just to ensure that any more that is generated is driven off, but I don't think it's as critical as with AG.
But remember that heat is what causes wort to produce DMS. Taht's why rapidly cooling the wort below 150F is so important. 150-212F is where DMS production happens.

So when you boil the extract, it could produce DMS again, especially if the extract is based heavily on Pilsner malt.
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Old 08-23-2008, 05:23 AM   #9
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I have been lurking here long enough that you would think I knew what DMS is, but I don't. Can anyone help a newb out?

 
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Old 08-23-2008, 06:32 AM   #10
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Dimethyl Sulphide.

http://www.homebrewtalk.com/wiki/index.php/DMS
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