A cartridge heater is an industrial heating element shaped like a tube, designed to be inserted into drilled holes for localized and precise heating in various industrial processes. Its construction involves a ceramic core with a resistance wire wrapped around it, enclosed in a dielectric metal sheath typically made of steel or stainless steel. Cartridge heaters find applications in diverse settings, serving as water heater elements in bag sealing, hydraulic oil, motor oil, gearbox, and water heating processes. They are also utilized in laboratory and food equipment.