WATROD™ Tubular Heaters

Detail Available in single- or double-ended termination styles, the versatile and economical WATROD tubular heating element from Watlow lends itself to virtually the entire range of immersion and air heating applications.
  The single-ended WATROD tubular heater design has both terminals at one end. The opposite end is sealed. Flexible lead wires are 12 in. (305 mm) crimp connected to the terminal pin and have silicone-impregnated fiberglass oversleeves.
  The double-ended WATROD, with its round cross-sectional geometry, are highly adaptable for bending—especially when bending is performed in the field. Watlow’s double-ended MULTICOIL tubular elements offer various combinations of resistor coils and thermocouples inside one sheath. They have the ability to sense the heater’s internal temperature accurately every time, or offer three-phase capability in one element.
  Both single- and double-ended WATRODs share many construction features delivering long life—the resistance wire is centered in the heater sheath and electrically insulated with compacted, high-grade magnesium oxide for superior heating performance.
  WATROD tubular heating elements have a variety of mounting and termination options making them highly popular among industrial customers.
Features & Benefits Single-ended: UL® and CSA component recognition to 240VAC
  Double-ended: UL® and CSA component recognition up to 600VAC
Precision wound nickel-chromium resistance wire Distributes heat evenly to the sheath for optimum heater performance
Silicone resin seals Protects against moisture contamination and is rated to 221°F (105°C)
MgO insulation filled sheath Maximizes dielectric strength, heat transfer and life
Standard sheath materials Steel, 304 and 316 stainless steel, alloy 800/840 and alloy 600
53 standard bend formations Allows forming the heating element to the application. Spirals, compound bends and multi-axis and multi-plane configurations
Stainless steel studs Fusion welded to terminal pins for mechanical strength


Material Maximum Operating Temperatures Maximum Watt Densities
  F° W/in2 W/cm2
Double-Ended Alloy 800/840 1800 982 45 6.9
Double-Ended Stainless Steel 350 175 60 9.3
Double-Ended Steel 750 400 45 6.9
Singled-ended Alloy 800/840 1600 870 45 6.9
Single-Ended Stainless Steel 1200 650 60 9.3