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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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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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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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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Lid on or off when doing full boils?
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