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. Optional moisture resistant (NEMA 4), explosion resistant (NEMA 7) and explosion/moisture resistant (NEMA 7/4) enclosures are available to meet specific application needs. Optional thermostats provide convenient process temperature regulation to the screw plug immersion heater.
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) dependent on application. Wattages to 38 kW, 120 W/in2.
Incoloy® Sheath
Weak chemical solutions, oils, tar, caustic soda, detergent, alkaline solutions, molten salts. Demineralized, deionized or pure water (sheath passivation is recommended). Other aqueous solutions not corrosive to Incoloy® sheath. Air, gas mixtures and super-heated steam. Sheath temperatures to 1600°F (871°C) dependent on application. Wattages to 38 kW, 120 W/in2.
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) dependent on application. Wattages to 38 kW, 120 W/in2.
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) dependent on application. Wattages to 38 kW, 120 W/in2.
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