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  • Install the heaters in a horizontal duct with the terminal housing at the side or bottom.
  • Use tandem mounting (several heaters in series) when possible.
  • Secondary linear cutout - Manual reset complete with back-up magnetic contactor on units under 300 V, 30 kW and less
1 to 120 Kilowatts (kW) Power QID Insert Air Duct Heater with Finned Elements
Unit of Measure
Items 1 to 120 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
QFD0010
1 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements 		1 to 120 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
QFD0025
2.5 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements 		1 to 120 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
QFD0075
7.5 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements 		1 to 120 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
QFD0100
10 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements 		1 to 120 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
QFD0125
12.5 Kilowatts (kW) Power QFD Flanged Air Duct Heater with Finned Elements
Description N/A
  • Install the heaters in a horizontal duct with the terminal housing at the side or bottom.
  • Use tandem mounting (several heaters in series) when possible.
  • Secondary linear cutout - Manual reset complete with back-up magnetic contactor on units under 300 V, 30 kW and less
Brands N/A WATTCO™
Power N/A 1.0 kW N/A 2.5 kW N/A 7.5 kW N/A 10.0 kW N/A 12.5 kW
Phase N/A 1 N/A 1 3 N/A 1 3 N/A 1 3 N/A 1 3
Standard Voltage at Single Phase N/A 120 V208 V N/A 120 V208 V N/A 208 V480 V N/A 208 V480 V N/A 208 V480 V
Standard Voltage at Three Phase N/A N/A 240 V N/A 240 V600 V N/A 240 V600 V N/A 240 V600 V
Dimension A N/A 6 in152 mm N/A 6 in152 mm N/A 14 in356 mm N/A 14 in356 mm N/A 16 in406 mm
Dimension B N/A 6 in152 mm N/A 6 in152 mm N/A 8 in203 mm N/A 12 in305 mm N/A 12 in305 mm
Dimension C N/A 6 1/2 in163 mm
Dimension D N/A 7 in178 mm
Dimension E N/A 2 in51 mm
Minimum Air Flow N/A 50 ft³/min1.4 m³/min N/A 150 ft³/min4.2 m³/min N/A 390 ft³/min11.0 m³/min N/A 500 ft³/min14.1 m³/min N/A 625 ft³/min17.7 m³/min
Number of Finned Elements N/A 2 N/A 3 N/A 4 N/A 6 N/A 6
Approximate Weight N/A 15 lb7 kg N/A 15 lb7 kg N/A 20 lb9 kg N/A 25 lb11 kg N/A 30 lb14 kg
Frame Construction Type N/A Flanged Duct
Tubular Elements N/A Finned
Heater Type N/A QFD
Primary Linear Cutout Temperature N/A 160 ºC71 ºF
Primary Linear Cutout Alternating Current (AC) Voltage N/A 277 V600 V
Primary Linear Cutout Current N/A 10 A25 A
Primer Linear Cutout Type N/A Non-Inductive
Secondary Linear Cutout Temperature N/A 107 ºC225 ºF
Secondary Linear Cutout Alternating Current (AC) Voltage N/A 277 V600 V
Secondary Linear Cutout Current N/A 10 A25 A
Secondary Linear Cutout Type N/A Non-Inductive
Alternative Auxiliary Duct Heater Controls N/A The following controls are supplied by WATTCO™ on the duct heater or are available as an EEMAC rated control panel for wall mount:
  • Duct thermostats
    • QFD (1 stage)
  • QFD (2 stage)
  • QFD (0 -135 OHM)
  • Controller
  • Room thermostat
  • Bulb holders
  • Silent contactors
  • SCR controllers
  • Sail switch
  • Fixed pressure differential switch
  • Main disconnect
  • Pneumatic electric switches
  • On-off switch
  • Magnetic contactors
  • Step controllers
  • Load fuses
  • Stage fuses
  • HRC fusing
  • Control transformers
  • Bottom terminal box
  • Secondary manual reset thermal cut-out
  • Fan interlock relay
  • Protective screens
  • Pilot lights
Application N/A Comfort Heating
Note N/A Units are only examples. For safety reasons, refer to this as a guideline for custom design orders. Custom designed units will be built according to the requirements of your specific application.

QFE and QIE Incoloy® tubular duct heaters are only available upon request.