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Industrial Heaters & Heating > Duct Heaters

LDH Series and D Series duct heaters are 100 percent energy efficient and are designed with Incoloy® sheath protected resistance coils. The LDH SERIES and D SERIES duct heaters can also be easily installed in applications requiring a wide range of temperatures. Constructed of 0.430 in. (11 mm) diameter WATROD™ heating elements mounted to a ¼ in. (6 mm) thick steel flange, the LDH SERIES and D SERIES duct heaters are easily adapted to many non-pressurized, air-heating systems such as HVAC.

Features and Benefits

  • Long life Incoloy® sheath
  • Resists corrosion/oxidation while protecting resistance coils against contamination
  • MgO insulation filled elements compacted to rock hard density
  • Maximizes dielectric strength, heat transfer and life
  • Field replaceable heating elements
  • Permits easy service and reduces downtime. Element change-out is made simple by a single screw clamp (D SERIES only)
  • 31⁄2 in. (90 mm) thick mineral insulation
  • Keeps wiring cooler and reduces heat loss
  • Silicone resin seals rated to 221°F (105°C)
  • Protects elements against moisture and other contaminents
  • General purpose terminal enclosure
  • Offers easy access to wiring 1⁄4 in. (6 mm) inside diameter thermowell
  • Accepts an optional Type J or K thermocouple for accurate sheath temperature sensing (D SERIES only)
  • Rigid stainless steel supports
  • Prevents element sagging or deformation in various mounting positions
  • 1⁄4 in. (6 mm) thick steel flange with 3⁄8 in. (9.5 mm) diameter mounting holes
  • Easily bolts to the duct wall
  • WATROD hairpins are repressed (recompacted) after bending to assure MgO density
  • Eliminates hot spots and electrical insulation voids
  • Stock heaters feature from 3 to 60 elements
  • Meets a wide variety of kilowatt demands
  • One or three phase voltages
  • Meets local power supplies Maximum 48 amperes per circuit
  • Complies with National Electrical Code (NEC) Ceramic fiber insulation available
  • Keeps wiring cooler and reduces heat loss Greater than 1⁄4 in. (6 mm) with 304 or 316 stainless steel flange material
  • Easily bolts to the duct wall 60 plus element designs available
  • Meets a wide variety of kilowatt demands

©2005, 2011 Watlow Electric Manufacturing Company, all rights reserved. Watlow®



Duct Heaters


Performance Capabilities

  • Watt densities to 40 W/in2 (6.2 W/cm2)
  • Recommended process temperatures from -20 to 1200°F (-29 to 650°C)
  • Catalog P/N wattages to 225kW
  • Voltages to 600VAC
  • Wattages to 2.2 megawatt
Product Info (pdf)

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