Screw Plug Immersion Heater

Screw Plug Immersion Heater
Screw plug immersion heaters are ideal for direct immersion heating of liquids, including all types of oils and heat transfer solutions. Available in a variety of sizes, Watlow screw plug immersion heaters feature both WATROD round and FIREBAR flat tubular elements. Heating elements are hairpin bent and either welded or brazed into the screw plug, depending on element sheath and plug material compatibility. General purpose terminal enclosures are standard with optional moisture resistant, explosion resistant and explosion/moisture resistant enclosures available to meet specific application needs. Optional thermostats provide convenient process temperature regulation to the screw plug immersion heater.

Features and Benefits

  • UL® and CSA component recognition
  • A variety of element sheath and screw plug materials to meet your application needs
  • Integral thermowells provide convenient temperature sensor insertion and replacement without draining the fluid being heated
  • Terminal enclosures provide ability to be rotated to simplify connection with existing conduits
  • Welding or brazing WATROD and FIREBAR elements to the screw plug for a pressure tight seal


Performance Capabilities

  • Watt densities up to 100 W/in2 (15.5 W/cm2)
  • Wattages up to 24 kilowatts
  • Voltages up to 480VAC
  • Alloy 800/840 sheath temperatures up to 1600°F (870°C)

Typical Applications

  • Water
  • Boiler equipment
  • Vapor degreasers
  • Fuel oils
  • Heat transfer fluids
  • Caustic solutions

Download the Screw Plug Immersion Heater Datasheet


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