HIGHWAT coil and cable heaters are reliable, high performance small diameter heaters used whenever a large amount of heat is required in a confined space. These coil heaters are fully annealed and can be formed into various shapes and forms. Coil and cable heaters can accommodate thermocouple sensors, and their cross-section could be made square or rectangular to improve heat transfer. HIGHWAT coil heaters are successfully used as powerful heating cells in plastic injection molding hot runner nozzles.