A steam jacketed kettle is the most efficient and economical jacketed cooker of boiling and simmering large quantities of food product, like simmering or boiling soups, sauces, gravies. It is constructed in the form of a hemispherical shaped shell usually made of stainless steel that is comprised of an inner kettle and an outer jacket. A typically steam jacketed pot extends from the bottom of the kettle to between half and two-thirds of the distance to the rim.
Steam carries approximately six times the energy of boiling water and gives up that energy upon contact with a colder surface. This simple fact makes steam an ideal heat transfer medium, and steam jacketed kettles the ideal way to cook, reheat and hold a wide variety of menu items.