If I want to brew a 5 gallon batch, how large of a kettle do I need to do so comfortably?

How about 10 gallons?

2 Answers 2


Based on my own experience, an 8 gal. kettle will barely work for a 5 gal. batch. Even at that, you might have to boil a concentrated wort and add top up water after the boil. Remember that in addition to accounting for trub and evaporation, you also need some headroom in there to start with. I wouldn't recommend anything less than 15 gal. for a 10 gal. batch.

  • Thanks Denny. How about a 10 gal. for a 5 gal. batch? Oct 26, 2014 at 20:08
  • That will work. I remember the first time I did a 5 gal. batch in a 15 gal. kettle. I thought there was no chance of boilover, then I turned my back for a second....the point being that no matter what size you use, you need to learn it's capabilities.
    – Denny Conn
    Oct 27, 2014 at 15:35
  • I use a 15 gallon kettle and typically do 10 gallon batches. However, I don't have any problems doing the occasional 5 gallon batch with that equipment. Oct 29, 2014 at 14:29
  • Agreed - 8gk for 5gb is hard for pils/long boils. I have had a couple of brews with an 8 gal that I had to hold some of the wort out for 30 mins (2 hour boil)
    – Wyrmwood
    Oct 30, 2014 at 20:39

Well, it depends on the losses you assume along the way.

For 5 gallons, if you assume a trub loss of 0.5 gallons, and evaporation loss of 1.0 gallon, then you would need 6.5 gallons of wort to get 5 gallons into a fermenter. If you follow the oft-quoted rule of thumb that you want minimum headspace in your kettle equal to one-third of your boil volume, that means the minimum kettle size is around 8-2/3 gallons. I have heard of people using 8-gallon kettles. I recommend more like 10-gallons.

For 10 gallons, I suppose you could double that.

  • Based on your assumptions, it sounds like there would be no headroom in the kettle.
    – Denny Conn
    Oct 26, 2014 at 16:02
  • @Denny, well to be clear, I am recommending 10-gal. kettle for a 5-gal. batch, and saying 8-2/3 is sort of a bare minimum for that size batch. I think we are in agreement as to the best practice. Oct 29, 2014 at 4:21
  • Sorry, looks like I misunderstood.
    – Denny Conn
    Oct 29, 2014 at 15:37

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.