If you're doing extract, then yes....if you're going allgrain, then no...you need to know the boiloff rate of your bayou and figure it in...
Why don't you run a test with plain water before you actually start working woth your wort...Bring 6 gallons up to boil and time it til you get 5 1/2...Then cool the water and use it for either your strike/sparge water or if extract use it for your wort and topp off water...That way you'll know the boiloff rate of your rig...
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