1/8-inch FIREROD® Cartridge Heaters

Miniature FIREROD Provides Maximum Performance Where Space Is Limited

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.

Features & Benefits

Miniature size

Low mass

Swaged construction

Numerous lead options available

Outlasts competitors in life testing

Miniature size

Delivers high performance in a small package and supports a wide variety of application requirements

Low mass

Offers better heat transfer, quicker response time and increased heater life due to lower internal temperature

Swaged construction

Higher watt density and temperature capabilities, maximum heat transfer and increased safety due to low leakage

Optional internal thermocouple

Reduces system footprint and measures temperature at point of application

Manufactured to the highest quality standards

Backed by 50 years of industry expertise and outlasts competitors in life testing

Numerous lead options available

Maximum flexibility and performance


Maximum Operating Temperatures
Maximum Watt Densities
Alloy 600 1400 760 400 62
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Quality Certificates

ISO 90012008 Exp 2018 St Louis

ISO 90012008 Certificate Singapore

IQNet - ISO 9001 2008 - Watlow GmbH

DQS - ISO 9001 2008 - Watlow GmbH

DQS - ISO 9001 2008 - Watlow GmbH English