WATLOW 1/8″ 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 Watlow® FIREROD® not only set the industry standard for cartridge heaters, it continues to make improvements in construction and design. Among these innovations is the 1/8-inch FIREROD.

This miniature cartridge heater with swaged construction features high watt density, is capable of high operating temperature and provides long life in applications where it is essential to have a very small size. Like all of Watlow’s other FIRERODs, the 1/8-inch contains a resistance wire closer to the sheath and compacted MgO insulation, which maximizes heat transfer.



Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 600 1400 760 400 62
  • Maximum Voltage: 240V
  • Maximum Wattage at 240V: 744 W
  • Maximum Amperage: 3.1 amp
  • Wattage Tolerances: +10 percent, -15 percent
  • Dimensions: Lengths less than 1.0 in. (25.4 mm)
  • Applications


  • Burn-in chip test system
  • Mass spectrometry
  • High-definition ink jet printers
  • 3D printing, fused deposition modeling
  • Gas chromatography
  • Respiratory equipment
  • Gas analyzers
  • Freeze protection
  • Packaging
  • Features & Benefits

    Features & Benefits

    Features Benefits
    Miniature size
  • Delivers high performance in a small package
  • Supports a wide variety of application requirements
  • Low mass
  • Offers better heat transfer
  • Provides quicker response time
  • Increases heater life due to lower internal temperature
  • Swaged construction
  • Provides higher watt density and higher temperature capabilities
  • Allows maximum heat transfer
  • Increases safety due to low leakage
  • Optional internal thermocouple
  • Reduces system footprint
  • Manufactured to the highest quality standards
  • Outlasts competitors in life testing
  • Backed by 50 years of industry expertise
  • Numerous lead options available
  • Designed for flexibility and performance
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