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  Screw Plug Immersion Heaters









For Direct Immersion Heating Applications

 Product Spec Sheet



 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 stock and Made-to-Order 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 conven:ent process temperature regulation

Performance Capabilities


  •  Watt densities to 120 W/in2 (18.6 W/cra?)
  • Watt:ages to 38 kW
  • UL and CSA component
  • Passivated 316 stainless steel sheath temperatures to 1200F (650'0)
  • 304 stainless steel sheath temperatures to 1200'F (650 C)
  • Steel sheath temperatures to 750'F (4000)
  • Copper sheath temperatures to 350F(175C)