Steam jacketed kettles and boiling pans — double-walled vessels that heat a batch through the jacket instead of the base, so stock, sauce and soup cook at volume without catching. Tilting and agitator models empty without ladling, and the shelf carries rice cookers and pressure cookers for the same batch work.
Heat enters through the jacket rather than the base, so stock and sauce cook evenly without catching; a steam jacketed kettle also frees a burner and handles a far larger batch.
Tilting empties by pouring, which matters once a batch is too heavy for one person to ladle out; fixed pans suit smaller volumes and cost less.
Constant stirring — worth it for thick sauces, custards and anything that would otherwise need a cook standing over it, while thin stocks rarely justify one. Tell us what you're cooking and we'll advise.
An electric boiling pan is simpler to install and holds a steadier simmer for stock and sauce. A gas boiling pan heats faster and suits a kitchen that already has a gas line — the difference shows most on the first boil of the day.