Inkleg wrote:Since your bringing the wort up to boil as you pull the grain bag there is no need to do a mash out when doing BIAB.
From an enzyme stopping reason this is true for sure.
From a full volume/no-sparge BIAB (like I am doing in the Mash & Boil) reason, having it get and stay between 170-180 for about 10-15 minutes and stirring it during this timeframe, without it going much above 180 and pulling theoretical tannins or what not from the grains (never has happened to me but supposedly it can), you will liquefy/release more sugars then if you simply pulled the bag, especially if you stir it. At least it works for me.
Because of the way the Mash & Boil works (6 degree temperature variance) the one thing that got my efficiency to jump greatly was kicking up the target mashout temperature to 173-174 degrees instead of simply setting it at 170. Setting it at 170 didn't work so well, because it doesn't stay there long enough.
I stir it after the burner kicks off, then wait for it to cycle again, and stir it again before pulling the basket (which is my "bag"). My mash efficiency went up a lot using the same grains (as in same malt / all crushed at the same time) in the next batch just by doing that. Between that and nailing my mash PH by pre-adjusting, I'm currently hitting 15% or more higher efficiency then I was the first batch every time now. As in somewhere in the 80%+ mash efficiency range the last 6 batches, vs. the upper 60s/low 70s. I hit 90% theoretical last batch (but I blame that extra jump and call it "theoretical" more on that it was mostly Maris Otter).