WATLOW FIREROD® Cartridge Heater

Watlow designed and manufactured the first swaged cartridge heater and revolutionized the heating element industry.

With premium materials and tight manufacturing controls, Watlow’s cartridge heaters (insertion heaters) provide superior heat transfer, uniform temperatures, resistance to oxidation and corrosion and long life even at high temperatures. Customers benefit from Watlow’s custom designs, on-time delivery, quality and technical assistance.

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Product Description

Product Description

The FIREROD® cartridge heater revolutionized the heating element industry in 1954 when it was patented as the first swaged cartridge heater. The mechanical procedure of swaging reduces the diameter of the heater by compacting the unit; this directly improves the heat transfer and efficiency of the heater.

FIREROD® cartridge heaters are built using only the finest materials and construction methods and are backed with extensive quality assurance programs. With premium materials and tight manufacturing controls, the FIREROD® heater provides superior heat transfer, uniform temperatures, resistance to oxidation and corrosion and a long life even at high temperatures.

FIREROD® offers many delivery programs to meet your needs.



Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 800 1400 760 400 62
Stainless steel 1000 538 400 62
  • Part temperatures up to 1400°F (760°C) on Alloy 800 sheath
  • Watt densities up to 400 W/in² (62 W/cm²)
  • Maximum voltage up to 480V
  • Applications


  • Semiconductor chamber heating
  • Semiconductor wafer lead connection
  • Semiconductor wire and die bonding
  • Freeze protection and deicing of equipment in cold climates or applications
  • Humidity control
  • Patient comfort heating used in medical devices
  • Mold die and platen heating
  • Seal bars used in packaging equipment
  • Test sample heating in gas chromatography
  • Features And Benefits

    Features And Benefits

    Features Benefits
    Nickel chromium resistance wire
  • Ensures even, efficient distribution of heat to the sheath
  • Magnesium oxide insulation of specific grain and purity
  • Results in high dielectric strength and contributes to faster heat-up
  • Alloy 800 sheath
  • Resists oxidation and corrosion from many chemicals, heat and atmospheres
  • Minimal spacing between element wire and sheath
  • Results in lower internal temperature
  • Accommodates a design with fewer or smaller heaters operating at higher watt densities
  • Conductor pins
  • Provides a metallurgical bond to the resistance wire
  • Ensures a trouble-free electrical connection
  • UL® and CSA approved flexible stranded wires
  • Lead insulation rated to temperatures of 480°F (250°C)
  • Patented lead adapter (LA) method
  • Allows same day shipment on more than 150,000 configurations of stock FIREROD® heaters and lead combinations
  • International Organization for Standardization (ISO) 9001 certified
  • Provides confidence that quality and reliability expectations are met