How to compensate for a slow boil-off rate.

Discussion in 'General Brewing Discussions' started by Vinyasa, Dec 27, 2020.

  1. Vinyasa

    Vinyasa Member

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    I am trying to make 5 gallon batches of all-grain recipes, but my boil-off rate is very slow, about 0.5 gallons/hour. SO if I start with 6.5 gallons of wort as most recipes say, I end up with 6 gallons after the boil.

    Is it best to start out with less wort, say 5.5 gallons so that I am at 5 gallons after boil, or is it best to still start at 6.5, but to boil for more than one hour to reach 5 glassons?
     
  2. Hawkbox

    Hawkbox Well-Known Member

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    I would personally go for less wort, but that can reduce your efficiency. You could easily boil longer, just change how you add hops to account for it.

    Either way will work for you, just have to approach them from different angles.
     
  3. Vinyasa

    Vinyasa Member

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    So I assume that I just boil until I have 0.5 gallons more than I need, and then start the 60 min hop additions...?
     
  4. Hawkbox

    Hawkbox Well-Known Member

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    Basically yeah.
     
  5. Nosybear

    Nosybear Well-Known Member

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    According to what I recently read about thermal loading of worts, revel. Plan for the lower losses and enjoy.
     
  6. Vinyasa

    Vinyasa Member

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    I'm sorry, I don't understand...
     
  7. Craigerrr

    Craigerrr Well-Known Member

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    I think he means to start with less water so that your preboil volume is that 1/2 gallon more than you batch size. Having said that, I find that I typically lose a 1/2 gallon to trub in the fermenter, and yet more if I am dry hopping, so I try to put a minimum of 5.5 gallons on the fermenter, closer to 6 if I have a significant amount of hops going into the fermenter.

    Do you bottle or keg?

    What are you fermenting in?
     
  8. Vinyasa

    Vinyasa Member

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    Fermenting in an Anvil SS then bottling.
    Isn't the gravity different if I boil down versus just starting with less wort?
     
  9. SabreSteve

    SabreSteve Well-Known Member

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    I also have a boil off rate of .5 gallons an hour. I plan for 5.5 grains pre-boil. I pour my kettle into the fermenter so I don't count on leaving anything behind in the kettle. I've never seen a low boil off rate as a negative. And no you're gravity won't be any different if you're using the same amount of malt and ending with same volume. Doesn't really matter how you get there.
     
  10. Vinyasa

    Vinyasa Member

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    But won't the wort be more concentrated if I boil it down as opposed to using less of it?
     
  11. SabreSteve

    SabreSteve Well-Known Member

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    No. If you're using X pounds of grain and finishing at Y gallons of wort your gravity will always be about the same as long as the final volume is the same. The starting volume is pretty irrelevant. I actually target a gallon less in my kettle than what I want in the fermenter because I max out my kettle (new bigger kettle supposed to be delivered Tuesday!) and then I top the fermenter up with a gallon of water like an extract batch. My gravity ends up coming out the same as having a greater volume in the kettle and boiling down. Point is if you're starting with the same amount of sugars and ending at the same volume that's all that matters number wise anyways
     
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  12. Craigerrr

    Craigerrr Well-Known Member

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    Essentially, either boil off the extra water, or don't add it in the first place. A half gallon per hour seems pretty low, is that on you kitchen stove?
     
  13. SabreSteve

    SabreSteve Well-Known Member

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    That's what mine is so that'd probably make sense
     

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