Jacketed cooking pot

A steam-jacketed kettle is similar to a double boiler and cooks large quantities of food by using steam heat. It is designed with both an inner and outer steel wall that cooks the contents inside by releasing steam into the space between the walls. These devices are often used to cook foods like stock, gravy, sauce, or soup, and may be powered by electricity or gas. They come in various sizes, for installation on the floor, countertop, or wall. Steam-jacketed kettles are often used in restaurants and industrial kitchens, where very large amounts of food are prepared daily.

All the different styles and sizes of steam-jacketed kettle use steam to cook the contents inside. Most are made from stainless steel, and usually, the steam jacket is permanently filled with treated, distilled water. Since steam encapsulates most of the kettle, it may cook more evenly than a traditional stock pot because it offers a more uniform cooking surface. It also tends to warm contents more quickly than a traditional pan, heated primarily from the bottom.