Screw Plug Immersion Heaters

Screw Plug Immersion Heaters consist of tubular elements welded or brazed into a threaded screw plug which can then be inserted into a threaded opening in a tank wall or through a mating full or half coupling.

Screw Plug Immersion Heaters include one, two or three hair-pin bent tubular element(s) joined to a threaded hex plug. Screwed into tank walls, this UL Listed/CSA Certified direct contact heat source heats liquids, viscous fluids, forced air and gases with maximum energy efficiency. In addition, elements can be bent in many configurations to suit a variety of applications.

Most screw plug heaters come with a thermowell (for temperature control sensors) and a completely wired terminal box for electrical connection. Certain models are available with a patented 360° rotatable screwplug housing to facilitate easy conduit connections. Select from a wide variety of sheath materials. Various element lengths, plug sizes and ratings from 0.5 kW and up, for 120 to 600 volts.


Screw
Plug
NPT		 *Min. Hole
Diam.		 "A" "B" "C" Thermowell
Bulb Size
in mm in mm in mm in mm in mm
1" 1-1/8 29 7/8 22 1-1/4 32 1-3/8 35 1/4 6.4
1-1/4" 1-3/8 35 1-5/16 24 1-5/16 33 1-3/4 44 1/4 6.4
2" 2-1/4 57 1-1/16 27 1-9/16 40 2-1/2 64 3/8 9.5
2-1/2" 2-1/2 64 1-5/16 33 2-1/16 52 3 76 3/8 9.5

Steel Sheath Screw Plug Immersion Heaters

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.


Copper Sheath Screw Plug Immersion Heaters

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.


Incoloy® Sheath Screw Plug Immersion Heaters

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.


316 Stainless Steel Sheath Screw Plug Immersion Heaters

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





From Stovck or Made to Order. We fit your application. (Canada & USA) 1-866-685-4443a
Request Info ASAP