Brewing With Total Confidence
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Discussion in 'Beginners Brewing Forum' started by J1791Hernandez, Feb 13, 2021.
Can someone please explain to me what Boil Size Pre: and Post: mean when editing recipes.
Pre-Boil Volume - Boil-Off Volume = Post Boil Volume
(Where all volumes measurements are taken at room temperature)
If you don't yet know your systems actual boil-off rate/volume, a Boil-Off rate of ~1 gallon (~3.8L) per hour of boiling is a generally safe starting presumption for a "rolling" boil. A mild boil may reduce this down to ~0.75 gallons per hour of boiling. The width of the kettle has a lot to do with the boil off rate. A wider kettle will boil off at a higher rate than a narrower kettle...
Volume as measured "at boiling" is 'roughly' 1.041 times volume as measured at room temperature.
You could do a test of your boil off rate with a measured amount of water, boil for one hour, then measure remaining water. The difference in the two volumes is your boil off rate.
Basically what they said. Pre is before you boil, post is what is left over after.