Originally Posted by dumsboa09
Also, can't say as to where I heard this but is it not ok to leave a lid on cracked during my boil to cut down the loss? I've heard it's not good to do that due to the hot break.
I don't see why it'd have an effect on hot break, but perhaps others know of a reason. The bigger concern to me would be DMS, produced during the boil, staying in the liquid. However, I'd imagine boil-off percentage is mostly all that matters in that regard. If you don't taste cooked corn in your beers I wouldn't worry about it.