Commercial Grade Temperature Control


BrewJacket Immersion Pro is the best all in one fermentation control system available for 3-8 gallon (10L -30L) vessels. It can heat or cool your fermenting beer, wine, or mead by as much as 35°F (20°C) above or below your ambient temperature, and maintain the set temperature to 0.3° F, a level of control only found in commercial breweries, wineries, and meaderies.



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Compatible With Conical Fermenters

Our 4-Panel Conical Jacket allows you to use any conical fermenter with an 8-gallon capacity or less. Click learn more.

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No space required

If you have a spare corner, you can lager

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Just Set The Temp

It's that easy. Immersion will meticulously maintain whatever temperature you set, whether it's an ale fermenting at 64º F or a lager at 48º F. No refrigerator required.


BrewJacket Immersion can bring your homebrew lagers as low as 35º F (20º C) below the ambient temperature of your house, allowing you to create craft lager beers without a refrigerator. Just set the temp and Immersion cools your lager until it is achieved, then actively maintains the set temperature.

Lagers require fermentation temperatures around 50º F (10º C) for a period of 3 weeks or more. Before Immersion, this simply wasn’t possible to achieve without a dedicated second refrigerator or access to a bavarian cave. Have you ever wondered how to make a lager beer? Check out our how-to guide here.

BrewJacket Immersion


Immersion Pro adds the ability to heat as well as cool providing the perfect environment for any yeast in just about any ambient setting. Is your house at 62º F and your ale yeast needs to be at 69ºF to perfect the IPA you just brewed? Are you aiming for an ester-rich Belgian ale that needs to ferment at 78º F? Just set the temperature you’d like to ferment at and sit back. Your perfect ale will be ready in no time.

Performance Abilities

Degrees F Below Ambient*

Gallon Batch Sizes

Degree F Per Hour Cooling Speed

Compatible Fermenters

* Performance varies by fermenter. View expected performance on the Compatible Fermenters page.

Homebrew Temperature Controller

Stable temperatures make happy yeast, and happy yeast make world class beer. Because Immersion uses solid state cooling technology coupled with extremely precise resistance thermoprobes, temperatures measured are accurate to 0.1º F and the system will hold your ferment to 0.5º F. Thermowell recommended.

Fully Protected Ferment

To keep the heat from your house out of your beer, it has to be insulated. You wouldn’t keep the door to your refrigerator open, would you? The good news is we’ve created a highly insulated, water resistant, heavy duty jacket that can take anything your small brewery (or house) can throw at it, and it’s included with every BrewJacket Immersion.

With the same insulation factor as a freezer, the jacket protects against shocks in the ambient environment.

Skip The Refrigerator

BrewJacket Immersion can perform the tasks of a traditional lager fermentation refrigerator without sacrificing the space. Taking roughly the same footprint of the fermenter you already own, and consuming just 95w in power, you can achieve the best lagering results without a giant power hungry refrigerator taking up your personal space.


Buy At Your Local Homebrew Shop

Want to check out a BrewJacket Immersion in person before you purchase? Just head down to your local homebrew shop for a demo and to buy your Immersion right there.

Do you run a homebrew shop and would like to carry the BrewJacket Immersion? Contact

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