Immersion Circulator
A heater and pump that holds a water bath at a precise temperature. Borrowed wholesale from the kitchen, it turns infusion from a matter of days and guesswork into a matter of hours and a number.
Care & Maintenance
Care Instructions
- Descale the unit periodically per the maker's guidance.
- Dry it before storing to protect the element.
- Keep the impeller and intake clear of debris.
- Use a deep, heatproof container that clips securely.
Expected Lifespan
- •A quality circulator lasts many years with occasional descaling.
- •The seal and impeller are the usual long-term wear points.
Usage
Sous-vide infusions of spirits with fruit, spice, tea or herbs; fat-washing; and making syrups and cordials without boiling them. Typically 50 to 60°C for one to three hours in a vacuum bag or a sealed jar.
Precision Instead of Patience
A traditional infusion sits in a jar on a shelf for a week and is judged by tasting. It works, and it is entirely unrepeatable: temperature, light and time all vary, and no two batches match.
A circulator fixes every variable but one. Set 55°C for two hours and the result is the same every time, which matters if you are putting an infusion on a menu.
It is also faster by a large margin. Heat accelerates extraction substantially, so a vanilla or a chilli infusion that takes five days on a shelf takes two hours in a bath, with more control over where it stops.
Heat and Alcohol
The obvious objection, and it is half right. Ethanol boils at 78°C, so anything approaching that drives alcohol off and changes the spirit.
Working below 60°C avoids it entirely. At that temperature, in a properly sealed bag, essentially no alcohol is lost, since what little evaporates has nowhere to go and condenses back as the bag cools.
The real risk at higher temperatures is not strength but flavour. Delicate aromatics cook: fresh herbs go grassy and stewed, citrus peel turns marmalade-like, and a gin loses the botanical lift it was bought for. Lower and longer is almost always the better answer.
Fat-Washing
The technique that most justifies owning one. You combine a spirit with a fat, such as browned butter, bacon fat, sesame oil or coconut oil, and hold them together warm so the fat-soluble flavour compounds migrate into the alcohol.
An hour at 50°C does what several hours of shaking and waiting does at room temperature, and does it evenly. Then the whole thing goes in the freezer; the fat solidifies and is lifted off, taking its texture with it and leaving the flavour behind.
Don Lee's Benton's Old Fashioned, bourbon washed with bacon fat, made at PDT in 2007, is the drink that put it into general practice.
Times and Practicalities
Most infusions land between one and three hours at 50 to 60°C. Spices and dried botanicals are at the longer end, fresh herbs and citrus at the shorter, and tea wants twenty minutes or it turns tannic.
Use vacuum bags if you have a sealer, or a well-sealed Kilner jar, which works and takes longer to come up to temperature. Weigh either down, since spirit is less dense than water and floats, and an exposed top does not infuse.
Chill the bag in an ice bath before opening. Opening it hot loses aroma into the room, which is the flavour you spent two hours extracting.
Pro Tip
Keep the water gentle. Too much heat drives off the alcohol and the volatile aromas you were trying to capture.
What to Look For
- Accurate, stable temperature control at low settings.
- A secure clip to fix it to a deep container.
- Enough power to hold a decent volume steady.
- Simple, precise controls.
Common Mistakes to Avoid
- Setting the temperature too high and cooking off the alcohol.
- Bags not fully submerged, so infusion is uneven.
- Skipping the chill step when fat-washing, leaving a greasy spirit.
- Letting the water level drop below the minimum.
Professional Tips
- Seal properly. Alcohol vapour escapes a loose bag fast.
- Below 60°C. Higher and you cook the flavour.
- Weigh the bag down. Spirit floats in water.
- Chill before opening, so the vapour condenses back in.
Specifications
Material
Stainless steel and plastic
Capacity
Heats baths up to ~15–20 litres
Details
Precise thermostat with a clip mount; needs a deep container
History & Context
The immersion circulator crossed from the sous-vide kitchen into the bar as bartenders sought faster, repeatable infusions, using precise low heat to do in an hour what steeping does in days.
Common Questions
What does an immersion circulator do at a bar?
Holds a water bath at a precise temperature, which turns infusion into a repeatable process. Set 55°C for two hours and every batch matches. It is also far faster, since heat accelerates extraction from days to hours.
Isn't heat bad for alcohol?
Only above about 60°C. Ethanol boils at 78°C, and in a properly sealed bag below 60 essentially nothing is lost. The real risk higher up is flavour rather than strength: herbs stew, citrus turns marmalade-like, gin loses its lift.
What is fat-washing?
Combining a spirit with a fat such as browned butter, bacon fat or sesame oil, and holding them warm so fat-soluble flavour migrates into the alcohol. Freeze it, lift off the solid fat, and the flavour stays without the texture.
How long do infusions take?
One to three hours at 50 to 60°C for most things. Spices and dried botanicals sit at the longer end, fresh herbs and citrus at the shorter, and tea needs about twenty minutes before it turns tannic.
Related Equipment
Related Ingredients
Guide by Jerry Can Spirits