FIREROD Cartridge Heater

Zesta Watlow FIREROD Cartridge Heater
Zesta Watlow FIREROD Cartridge Heater
Zesta Watlow FIREROD Cartridge Heater
Zesta Watlow FIREROD Cartridge Heater
The Watlow® FIREROD® cartridge heater incorporates engineering excellence and is supported by almost 60 years of solid industry performance across a broad range of simple and complex applications. As the premier choice in swaged cartridge heating, thousands of industrial manufacturers continue to choose Watlow as their trusted thermal partner and certified cartridge heater supplier.
Built using 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. Every system component that leaves our manufacturing facilities meets our strict quality assurance specifications, in addition to those set forth by leading standards and regulating industries.
To meet our customer’s individual needs, there are many delivery options available for FIREROD heaters.

Watlow Firerod Datasheet (EN)
Watlow: Your Heat Solutions Resource Brochure (EN)

Watlow Firerod Fiche Technique (FR)
Watlow: Vos Solutions de Chauffage Brochure (FR)
Back to Firerod Cartridge Heaters

Nickel-chromium resistance wire
  • Ensures even and efficient distribution of heat to the sheath
Conductor pins
  • Provide a metallurgical bond to the resistance wire
  • Ensure a trouble-free electrical connection
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 heat, many chemicals and atmospheres
Minimal spacing between the element wire and sheath
  • Results in lower internal temperature
  • Accommodates a design with fewer or smaller heaters operating at higher watt densities
International Organization for Standardization (ISO) 9001 certified
  • Provides confidence that quality and reliability expectations are met
UL® and CSA approved flexible stranded wires
  • Lead insulation rated to temperatures up to 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

Product Specifications

Agency Approvals:
  • UL
  • CSA
  • Molds
  • Dies
  • Platens
  • Hot plates
  • Sealings
  • Fluid heating
  • Life sciences
  • Aerospace
  • Semiconductor
  • Food service equipment
  • 1/8, 1/4, 3/8, 1/2, 5/8", 3/4", 1"
  • 6.5, 8, 10, 12.5, 16, 20mm
Dimensional Tolerances:
  • Dia:
  • 1 inch units: ±0.003 inches
  • (±0.076 mm)
  • All other units: ±0.002 inches
  • (±0.0508 mm)
  • Length:
  • All units to 41⁄2 inches (115 mm)
  • long: ±3⁄32 inch (±2.4 mm)
  • 1⁄8 inch diameter units over
  • 41⁄2 inches (75 mm) long:
  • ±3 percent
  • All other units over 41⁄2 inches
  • (115 mm) long: ±2 percent
Internal Thermocouple:
Lead Protection:
  • Stainless steel overbraid
  • Stainless steel flexhose
  • Fiberglass sleeving
Lead Wire:
  • TGGT Fiberglass
  • MGT fiberglass
  • Teflon
  • Silicone
Max. Sheath Temperature:
1400°F (760°C)
Max. Voltage:
Max. Watt Density:
Watt densities to 400 W/in² (62 W/cm2)
Mounting Options:
  • Flange
  • NPT Fittings
Sheath Materials:
  • Incoloy
  • 316 stainless steel



  • 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 equipment