How does cooking with an immersion circulator work? — Brett, Marrero, La.
Marshall Brain Answered:
An immersion cooker is basically a water pump combined with a heating element and a precise thermostat. When you stick the immersion circulator in a pot or vat of water, the water can be kept at a carefully controlled temperature.
You can see an immersion circulator at work in this video:
Immersion circulators are often used in Sous Vide cooking, where the food is vacuum-sealed in a plastic bag and heated, like this:
In the following video, rib steaks cook at 131 degrees F for two hours before grilling: