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    MASH Temp increases during BIAB Mash?

    As a BIAB brewer (10+ batches), I'm mashing full volumes in my 10 gallon kettle. I heat my water/wort on a propane burner (Edelmetall) I've noticed that my mash temp actually increases during the 60 min mash from time to time. Today I heated 8.5 gallons of strike water to 157F (per Beersmith)...