Coil and Cable Heaters

The versatile Watlow coil/cable heater can be formed into a variety of shapes. Cable heaters are small diameter, high-performance units, fully annealed and readily bent to a multitude of configurations.

The cable heater can be formed into a compact, coiled nozzle heater supplying a full 360 degrees of heat with optional distributed wattage. A straight cable heater can snake through an equipment application. Flat spiral configurations can be used in high-tech manufacturing while a star wound cable can be used for air and gas heating.

Different applications require different construction methods, including one, two or four resistance wires; parallel coil or straight wire; drawn or swaged sheaths; with or without internal thermocouples; leads exiting from one or both ends, and round, rectangular or square cable cross sectionals.

Whatever the application, the Watlow coil heater and cable heater can be shaped to fit.


Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
304 stainless steel  1200 650 30 4.6
Alloy 600  1200 650 30 4.6
  • Continuous operating temperatures to 1200°F (650°C) with intermittent operating periods achieving up 1500°F (815°C) dependent on the type of element wire used
  • Sheath watt densities on the cable to 30 W/in² (4.65 W/cm²), and as high as 75 W/in² (11.62 W/cm²) subject to factory approval
  • Maximum voltage to 240V