Create World Class Craft Lagers and Ales

All without a refrigerator.

Introducing BrewJacket Immersion, the world’s first all-in-one fermentation temperature control system. Immersion is a powerful solid state cooler and temperature controller that gives you the ability to make the best homebrew lagers and ales you have ever created, without sacrificing space to a refrigerator.

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Now Compatible With Conical Fermenters

Our new 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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Make Award Winning Ales

Step-by-step video on how to use the BrewJacket Immersion to ferment a beer with ale yeast. Brew, sanitize, set temp, and pitch! It’s really that easy. When the yeast are done, you can either transfer to secondary, or just press a few buttons to drop the temperature and cold crash the beer.

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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 easily maintains temperatures for ales. Just set the temperature you’d like to ferment at and sit back. Ales produce considerable heat during primary fermentation, upwards of 5º to 10º F depending on your recipe. If left unchecked, hot fermentation environments can produce esters, fusel alcohols, and other classic homebrew flaws.

Quite possibly the biggest thing that separates home brewed from professionally-brewed beer is the temperature at which it was fermented.

Performance Abilities

Degrees F Below Ambient

Gallon Batch Sizes

Degree F Per Hour Cooling Speed

Compatible Fermenters

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, waterproof, beer-proof, 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.


As seen in

Carboys and Buckets


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Select The Style of Fermenters You Use

Whether you choose to use carboys or buckets or conicals, you get the exact same BrewJacket Immersion. Buckets and carboys have flat bottoms and fit into our Simple 15″ Jacket. Conicals have long legs and contoured bottoms and fit into our 4-Panel Conical Jacket.

If you change your fermenters in the future, you can buy the Simple 15″ Jacket or our 4-Panel Conical Jacket separately.



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