Industrial Screw Plug Immersion Heaters by Watlow

Flow Factor sells Watlow Industrial Screw Plug Electric 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 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.

• Watlow Process Water 1.25 inch Screw Plug immersion heaters with NEMA 1 Housing

• Watlow Process Water 1.25 inch Screw Plug immersion heaters with NEMA 4/7 Housings

• Watlow Clean Water 2 inch Screw Plug Immersion heaters with NEMA 1 Housing

• Watlow Clean Water 2 inch Screw Plug Immersion heaters with NEMA 4/7 Housings

• Watlow Process Water 2 inch Screw Plug Immersion heaters with NEMA 1 Housing

• Watlow Process Water 2 inch Screw Plug immersion heaters with NEMA 4/7 Housings

• Watlow DI Water 2.5 inch Screw Plug immersion heater with NEMA 1 Housing

• Watlow DI Water 2.5 inch Screw Plug immersion heater with NEMA 4/7 Housings

• Watlow Clean Water 2.5 inch Screw Plug immersion heaters with NEMA 1 Housing

• Watlow Clean Water 2.5 inch Screw Plug immersion heaters with NEMA 4/7 Housings

• Watlow Process Water 2.5 inch Screw Plug immersion heaters with NEMA 1 Housing

• Watlow Process Water 2.5 inch Screw Plug immersion heaters with NEMA 4/7 Housings

Performance Capabilities

• Watt densities up to 120 W/in2 (18.6 W/cm2)

• Wattages up to 38 kilowatts

• UL® and CSA component recognition up to 480VAC and 600VAC respectively

• Alloy 800/840 sheath temperatures up 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)

Features and Benefits

A variety of element sheath and screw plug materials

• Meets a variety of 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 magnesium oxide density, dielectric strength, heat transfer and life 21/2 in. (64 mm) NPT screw plug assemblies feature element support(s)

• Ensures proper spacing for maximizing heater performance and life