Pre Boil and Post Boil

Discussion in 'Beginners Brewing Forum' started by J1791Hernandez, Feb 13, 2021.

  1. J1791Hernandez

    J1791Hernandez New Member

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    Can someone please explain to me what Boil Size Pre: and Post: mean when editing recipes.
     
  2. Silver_Is_Money

    Silver_Is_Money Active Member

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    #2 Silver_Is_Money, Feb 13, 2021
    Last edited: Feb 13, 2021
    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.
     
  3. Craigerrr

    Craigerrr Well-Known Member

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    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.
     
  4. Hawkbox

    Hawkbox Well-Known Member

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    Basically what they said. Pre is before you boil, post is what is left over after.
     

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