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I agree with @Denny that stating evaporation as a fixed percent in your assumptions is somewhat meaningless for homebrewing because boiloff is constant based primarily on your kettle geometry and BTUs of heat. In other words, the percent being evaporated constantly goes up as the remaining volume shrinks (with 100% evaporation when the last drop is ...


First, expressing evaporation rate as a % is completely the worng way to do it. Boil is a constant gal./hr. and does not change due to batch size. You don't boil off twice as much for a 10 gal. batch as a 5 gal. batch. 6 liters/hr. is about what my boil off is using a converted keg kettle and a propane burner. I try to set the flame to the same level ...

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