I don't BIAB. Sure, with my 15 gallon kettle and a 12.5 gallon boil with propane I had to watch out for boil overs. But now using a 20 gallon kettle and a 18 gallon boil it's much less of a worry (very close to the brim.) With only 5500 watts it's hard to. Maybe if I never turned it down to a...