WATLOW Screw Plug Immersion Heaters


Watlow’s immersion heaters are designed primarily for direct immersion in liquids such as water, oils, solvents and process solutions, molten materials as well as air and gases. By generating all the heat within the liquid or process, these heaters are virtually 100 percent energy efficient. These versatile heaters can also be formed and shaped into various geometries for radiant heating and contact surface heating applications. UL® and CSA component recognized elements are available.

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Product Description

Product Description

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.

Specification

Specification

Material Maximum Operating Temperatures Maximum Watt Densities
°F °C W/in2 W/cm2
Alloy 800 1600 870 120 18.6
Stainless steel 1200 650 120 18.6
steel 750 400 120 18.6
N/A 350 175 120 18.6
  • Watt densities to 120 W/in² (18.6 W/cm²)
  • Wattages to 38 kilowatts
  • UL® and CSA component recognition to 480VAC and 600VAC respectively
  • Alloy 800/840 sheath temperatures to 1600°F (870°C)
  • Passivated 316 stainless steel sheath temperatures up to 1200°F (650°C)
  • 304 stainless steel sheath temperatures up to 1200°F (650°C)
  • Steel sheath temperatures up to 750°F (400°C)
  • Applications

    Applications

  • Deionized water
  • Demineralized water
  • Clean water
  • Potable water
  • Process water
  • Industrial water rinse tanks
  • Vapor degreasers
  • Hydraulic oil, crude, asphalt
  • Lubricating oils at API specified watt densities
  • Air and gas flow
  • Caustic solutions
  • Chemical Baths
  • Anti-freeze (glycol) solutions
  • Paraffin
  • Features & Benefits

    Features & Benefits

    Features Benefits
    A variety of element sheath and screw plug materials
  • Meets your application needs
  • Integral thermowells
  • Provides convenient temperature sensor insertion and replacement without draining the fluid being heated
  • Terminal enclosures
  • Provides ability to be rotated to simplify connection with existing conduits
  • Welding or brazing WATROD and FIREBAR elements to the screw plug
  • Provides a pressure tight seal
  • WATROD hairpins are repressed (recompacted)
  • Maintains MgO density, dielectric strength, heat transfer and life
  • 2½ in. (64mm) NPT screw plug assemblies feature element support(s)
  • Ensures proper spacing for maximizing heater performance and life
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