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The Watlow FIREROD® heater enters its 50th year of industry leading expertise as the premier choice in swaged cartridge heating. With premium materials and tight manufacturing controls, the FIREROD heater continues to provide superior heat transfer, uniform temperatures and resistance to oxidation and corrosion even at high temperatures. FIREROD offers many delivery programs to meet your needs: same day shipment, Ship-to-Stock or Just-in-Time. And our experience in customized engineering is reflected in over 250,000 FIREROD cartridge heater designs. Stock or made-to-order, the Watlow FIREROD delivers heat in a hurry.


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