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Industrial Heaters & Heating > Screwplug Immersion Heaters

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 (NEMA 1) terminal enclosures are standard; with optional moisture resistant (NEMA 4), explosion resistant (NEMA 7) and explosion/moisture resistant (NEMA 7/4) enclosures available to meet specific application needs.

Optional thermostats provide convenient process temperature regulation to the screw plug immersion heater.

Material
Maximum Operating Temperatures
Maximum Watt Densities
°F
°C
W/in2
W/cm2
 Incoloy®
1600
870
120
18.6
Stainless Steel
1200
650
120
18.6
Steel
750
400
120
18.6
Copper
350
175
120
18.6

Typical Applications
Steel Sheath - Fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, paraffin, degreasing solvents, alcohol, molten salt, and other solutions not corrosive to steel sheath. Sheath temperatures to 750°F (399°C) dependant on application.

Incoloy® Sheath - Weak chemical solutions, oils, tar, caustic soda, detergent, alkaline solutions, molten salts, demineralized, deionized or pure water (sheath passivation is recommended), and other aqueous solutions not corrosive to Incoloy® sheath. Air, gas mixtures and super-heated steam. Sheath temperatures to 1600°F (871°C) dependant on application.

Copper Sheath - Process water, water with very weak chemical solutions, demineralized, deionized or pure water, hot water storage for washrooms, showers, cleaning and rinsing parts, for freeze protection of cooling towers and sprinkler systems and other aqueous solutions not corrosive to copper sheath. Sheath temperatures to 350°F (177°C) dependant on application.

316 Stainless Steel Sheath - Weak chemical solutions, deionized or pure water (sheath passivation is recommended), and other aqueous solutions not corrosive to 316 Stainless Steel sheath. Air, gas mixtures and super-heated steam. Sheath temperatures to 1200°F (649°C) dependant on application.



Screwplug Immersion Heaters


Specifications

  • Watt densities to 120 W/in2 (18.6 W/cm2)
  • Wattages to 38 kilowatts
  • UL® and CSA component recognition to 480VAC and 600VAC respectively
  • Incoloy® sheath temperatures to 1600°F (870°C)
  • Passivated 316 stainless steel sheath temperatures to 1200°F (650°C)
  • 304 stainless steel sheath temperatures to 1200°F (650°C)
  • Steel sheath temperatures to 750°F (400°C)
  • Copper sheath temperatures to 350°F (175°C)

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