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LDH SERIES Duct Heaters - Application: High Temperature Air 800ºF (427ºC)

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Constructed of sturdy 0.430 in. (11 mm) diameter WATROD™ heating elements mounted to a 1/4 in. (6 mm) thick steel flange, duct heaters are easily adapted to many non-pressurized air-heating systems.
They are easily installed in applications requiring a wide range of temperature versus air flow combinations.
The modular duct heater offers increased reliability. The individual modules are removable through the housing of the assembly, which eliminates the need to pull the complete heater from the ductwork. This reduces downtime costs because the heating elements can be replaced individually. Performance improvements include quicker response time and reduced infiltration from the air stream being heated into the electrical enclosure.

Watlow® duct heaters offer advantages over gas or oil fired and open coil electric units with:
  • Installation flexibility-no flues or fuel lines
  • 100 percent energy efficient-no energy loss up the flue
  • Universal availability of electricity
  • Resistance coil in Incoloy® sheath is protected from corrosive environments
Choosing a Duct Heater
The English and metric graphs, will help you to select the correct duct heater. These graphs include: Watt Density vs. Air Temperature/Velocity, Watt Density vs. Sheath Temperature and Pressure Drop vs. Air Velocity.

These graphs, with the quick formulas on this page, along with information specific to your application, will determine the correct duct heater specifications. However, if engineering assistance is needed, contact your Watlow representative.


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LDH Series and D Series Duct Heaters

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LDH SERIES Duct Heaters - Application: High/Medium Temperature Air 800ºF/750ºF (427ºC/399ºC)-2 (LDH9S10S)

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  Results 1 - 25 of 33 Unit of Measure: Imperial | Metric | Both  1 2 

Code No.

# of Elements

Voltage

Watts

Phase

# Circ.

Dimension A

Dimension B

Dimension C

LDH9S10S 3 240 VAC 9 kW 1 1 28.25 in
718 mm
20.25 in
514 mm
3.75 in
95 mm
LDH9S3S 3 240 VAC 9 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
3.75 in
95 mm
LDH9S11S 3 480 VAC 9 kW 1 1 28.25 in
718 mm
20.25 in
514 mm
3.75 in
95 mm
LDH9S5S 3 480 VAC 9 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
3.75 in
95 mm
LDH18S10S 6 240 VAC 18 kW 1 2 28.25 in
718 mm
20.25 in
514 mm
6.75 in
171 mm
LDH18S3S 6 240 VAC 18 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
6.75 in
171 mm
LDH18S11S 6 480 VAC 18 kW 1 1 28.25 in
718 mm
20.25 in
514 mm
6.75 in
171 mm
LDH18S5S 6 480 VAC 18 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
6.75 in
171 mm
LDH27S10S 9 240 VAC 27 kW 1 3 28.25 in
718 mm
20.25 in
514 mm
9.75 in
248 mm
LDH27S3S 9 240 VAC 27 kW 3 3 28.25 in
718 mm
20.25 in
514 mm
9.75 in
248 mm
LDH27S11S 9 480 VAC 27 kW 1 3 28.25 in
718 mm
20.25 in
514 mm
9.75 in
248 mm
LDH27S5S 9 480 VAC 27 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
9.75 in
248 mm
LDH36S10S 12 240 VAC 36 kW 1 4 28.25 in
718 mm
20.25 in
514 mm
12.75 in
324 mm
LDH36S3S 12 240 VAC 36 kW 3 2 28.25 in
718 mm
20.25 in
514 mm
12.75 in
324 mm
LDH36S11S 12 480 VAC 36 kW 1 2 28.25 in
718 mm
20.25 in
514 mm
12.75 in
324 mm
LDH36S5S 12 480 VAC 36 kW 3 1 28.25 in
718 mm
20.25 in
514 mm
12.75 in
324 mm
LDH45S3S 15 240 VAC 45 kW 3 5 28.25 in
718 mm
20.25 in
514 mm
15.75 in
400 mm
LDH45S11S 15 480 VAC 45 kW 1 3 28.25 in
718 mm
20.25 in
514 mm
15.75 in
400 mm
LDH45S5S 15 480 VAC 45 kW 3 5 28.25 in
718 mm
20.25 in
514 mm
15.75 in
400 mm
LDH54S3S 18 240 VAC 54 kW 3 3 28.25 in
718 mm
20.25 in
514 mm
18.75 in
476 mm
LDH54S11S 18 480 VAC 54 kW 1 3 28.25 in
718 mm
20.25 in
514 mm
18.75 in
476 mm
LDH54S5S 18 480 VAC 54 kW 3 2 28.25 in
718 mm
20.25 in
514 mm
18.75 in
476 mm
LDH63S3S 21 240 VAC 63 kW 3 7 28.25 in
718 mm
20.25 in
514 mm
21.75 in
552 mm
LDH63S11S 21 480 VAC 63 kW 1 3 28.25 in
718 mm
20.25 in
514 mm
21.75 in
552 mm
LDH63S5S 21 480 VAC 63 kW 3 7 28.25 in
718 mm
20.25 in
514 mm
21.75 in
552 mm
  Results 1 - 25 of 33 1 2