0191 5166636 enquiries@ht-uk.com

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


  • Plastic injection molding nozzles
  • Semiconductor manufacturing and wafer processing
  • Hot metal forming dies and punches
  • Sealing and cutting bars
  • Medical, analytical and scientific instruments
  • Restaurant and food processing equipment
  • Cast-in heaters
  • Laminating and printing presses
  • Air heating
  • Textile manufacturing
  • Heating in a vacuum environment

Features & Benefits:

Features Benefits
High ductility
  • Allows the heater to be cold-formed into almost any shape
Low mass
  • Allows for quick response in both heating and cooling
Constructed with no open seams
  • Provides the capability of operating in unusual environments, including cryogenic and sub-freezing temperatures, high vacuum, gaseous and liquid immersion heaters
  • Decreases opportunity for corrosion
Constructed of standard 304 stainless steel, optional 316 stainless steel or Alloy 600
  • Provides high-temperature corrosion and oxidation resistance along with ideal expansion properties
Heater sheath can be brazed
  • Allows the permanent attachment of mounted fittings to the heater, contact your Watlow representative
Sizes ranging from 0.040 in. (1.02 mm) to 0.188 in. (4.8 mm) diameter
  • Delivers a lot of heat into a tiny space
Internal construction options
  • Allows for internal thermocouples and no-heat sections (not available in all sizes)