WilliamsWarn BrewKeg12.5™ | Stainless Conical | Unitank Fermenter | 12.5L | 3.3G

WilliamsWarn BrewKeg12.5™ | Stainless Conical | Unitank Fermenter | 12.5L | 3.3G

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  • Ferment and serve from the same vessel—no need to transfer from fermenter to keg
  • Low profile design fits inside a standard kegerator which can be used for fermentation temperature control
  • Fermenting under pressure allows you to ferment with lager strains at higher temps while reducing esters
  • Made from stainless steel with conical bottom
  • Extra-large collection container for harvesting yeast or dumping sediment

The #1 reason we love the BrewKeg Unitanks is that they eliminate kegging day, which saves a bunch of time. The Brewkeg12.5™ is perfect for a 3-gallon batch, and with the low profile, it still fits in a standard kegerator, which can be used for fermentation, as well as serving. When fermentation is done, crank down the temp, remove the yeast/trub collection ball and start immediately drinking because the beer is already carbonated. Since this is not the standard brewing process, stop and think that over - you don't need a separate night or hours on a weekend morning to clean and keg. You are going to save 2 or more hours with every batch! Plus, you are skipping the most oxidative step in brewing of going from your fermenter to your keg.  Yes, the one down side is that your fermenter is tied up as a keg but to many of us who really love brewing our own beer but are time challenged – the sacrifice is totally worth it.  

Another great time saving feature is that you can skip wort cooling and 'hot pack' these kegs, literally filling them after boil at around 190°F. Stick them in your refrigerator, let them cool overnight, and pitch yeast the next day.  Hot packing is gaining a lot of traction and we suggest you google the term to learn more.  It’s been a standard practice in Australian homebrewing for years.   

Okay, so there is not a lot out there about fermenting under pressure. We've been doing it for years now with a slew of pressurizable fermenters, including the BrewKeg, and if you want to make amazing lagers quickly you need to try it.  Fermenting under pressure reduces esters and even beers fermented between 65-80°F have amazing German lager malt profiles.  We once fermented a beer under pressure with WLP001 at room temp and all the tasters thought it was lager yeast.  The pressure relief assembly, in the center of the lid, is the slickest out there and adjusts from no pressure up to 25 psi. Leave it open for no pressure fermentations of ales and IPA's where you want the esters. Close it down to make amazing lagers under pressure, quickly.


  • Made from stainless steel
  • Conical base
  • Extra-large, easy to remove sediment ball
  • 25 psi working pressure & built in relief valve
  • 40 psi maximum pressure rating
  • Ferments clean and clear beer from 64-82°F
  • Beer is carbonated perfectly at the end of fermentation
  • Beer ready to enjoy sooner
  • Compact design fits in most kegerators
  • Eliminates kegging
  • Easy to clean and sanitize


  • Height: 25.9 in.
  • Diameter: 9.25 in.
  • Actual Volume: 15.1L (4.0 gal)
Item # FE165
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 20 LBS

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5.0 / 5.0
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Rated 5 out of 5
I Love This Thing
I originally got this when it first came out, specifically to make malzbier, hoping I could bottle straight from the unitank after a short 24hr ferment. That ended up not being the case since there's another step of pasteurization between fermenting and bottling, but that didn't stop me from transferring back to the unitank to cool, carbonate, and bottle after pasteurizing. In all these tasks the BrewKeg performed beautifully.

I will say the size made it a little awkward cleaning, sanitizing, and recleaning in the kitchen sink. Also, I added a spunding valve rather than relying on the built in pressure valve. I did give a try when pressure checking and it was fine, but I prefer a little more precise control. Other than that the BrewKeg was outstanding. I wish it had come out a decade earlier so I wouldn't have wasted money on all the things this replaced. :)
June 12, 2023