3 gallon better bottles

[nztkdt]

Enough head space for a 2.5 gallon batch? Need a blowoff tube?

 

[Calder]

0.5 gallons on 2.5. I'd use a blow-off just in case.

 

[govner1]

I'd definitely use a blow off tube. I use 5 gal BB's for three gal batches and frequently am saved by a blow off tube.

 

[Oginme]

I use the 3-gal BBs for 2-1/2 gal batches. For most brews less than about 1.060 OG, they work fine, no blow off tube needed. I start with lower fermentation temperatures, between 60F and 64F. Anything over 1.060, I add a blow off tube.

For lower gravity brews, such as session beers, I have even crept the volume up to 2-3/4 gal and have not had a problem with needing the blow off tube.

 

[JonM]

I always put 2.75 gals in my 3-gallon Better Bottles and have never had a problem. (Well, I always use a blowoff for the first couple days, but with a couple drops of Fermcap, the krausen never got anywhere near the top. And that's with all sorts of different recipes, all sorts of different yeasts, etc.)

Cheers!