WATTCO™ duct heaters come in various sizes and dimensions to fit any compartment. Three types of duct heaters are available: open coil, tubular or finned tubular heating elements that are either flanged or inserted in the duct.

Air duct heaters primarily use in air-flowing ventilation systems and comfort-heating applications. Process duct heaters mainly serve industrial process heating applications (ovens that require re-circulated air or forced circulation).

Wattco™ duct heater features

WATTCO™ designs and configures your electric heating element according to your specifications. Our team is dedicated to research and development, using the latest technologies while striving to meet every customer’s needs by manufacturing high-quality industrial heating products.

Since 1969, WATTCO™ has earned a reputation for expertise in developing and manufacturing electrical heating elements that make Wattco duct heaters the most easily adaptable industrial heating solution for most non-pressurized, air-heating systems

Wattco™ duct heater voltages

A broad range of custom-built electric duct industrial heaters with capacities up to 1000kW is available upon request. WATTCO™ heaters are ideal for applications with the following voltages

  • 347 volts/1 phase
  • 600 volts/1 phase
  • 600 volts/3 phases
  • 208/240 volts/1 phase
  • 208 volts/3 phases

WATTCO™ duct heaters have the international, American recognized Canadian Standards Association (CSA us) label, which sets the standards for the electric heating industry. Duct heaters can include proper built-in safety devices to extend the heater’s service life. Get a quote on a duct heater today.

WATTCO also manufactures other industrial heating products such as infrared heaters, control panels, immersion heaters, and more. Click here to view all of our products.


At Wattco, we have a dedicated team of experts ready to provide you with the answers and assistance you need. Whether you're a seasoned professional looking for technical specifications or in maintenance inquiring about our products, our team of knowledgeable professionals is here to help. 

Coiled duct heater
Coiled duct heater
duct heater finned
duct heater finned
Duct Heater Slip into Duct
Duct Heater Flanged
Tubular duct heater
X section tubular duct heater

Finned Tubular Elements vs. Unfinned tubular elements

Finned tubular elements

Unfinned Tubular elements

The most common design Available for approved special orders only
Include the highest wattage/cross section duct area
  • Increase corrosion resistance
  • High humidity environments
  • Corrosive chemical contaminants in the air stream
Energy saver Protect from electrical shock
Made of a steel tube with a corrugated steel fin wrapped around it and brazed together Made of steel or stainless steel tube
Maximize the heat transfer surface of the element Can be installed close to a register or grill
Provide lower operating temperature N/A
Designed for low maintenance Designed for low maintenance

Duct Heater Applications

  • Heat treating
  • Air drying operations
  • Air handling equipment
  • Forced air comfort heating
  • Core drying
  • Fan coils
  • Booster air heater
  • Air pre-heating
  • Terminal reheating
  • Multizone reheating
  • Heat pump auxiliary systems
  • Return air heating
  • Resistor load banks
  • Annealing
  • 16-gauge satin coat steel.
  • Exclusive modular construction with stock frame components used with 2” verticaland horizontal dimensional increments for faster delivery;
  • Single and three-phase tensions;
  • Stainless steel supports;
  • Field replaceable heating elements, if required;
  • ¼” (6 mm) inside diameter thermophile;
  • 3 ½ ” (90 mm) thick insulation;
  • General purpose terminal enclosure;
  • Primary linear cutout: 
    • 160ºF (71ºC)
    • 277/600 VAC
    • 25/10 AMP non-inductive
  • Secondary linear cutout:
    • Manual reset with back-up magnetic contactor on units of 300V, 30 kW and less.
    • 225ºF (107ºC)
    • 277/600 VAC
    • 25/10 AMP non-inductive
  • Special sizes, wattages, and materials available upon request; 
  • Built stainless steel frames available upon request;
  • American and Canadian Standards Associations (CSA, CSA us & UL) certified.


  • Versatile
  • Corrosion and oxidation resistant
  • Easy to maintain
  • Easy to install
  • Durable
  • Compatible with local power supplies
  • Built for safety
  • Maximal dielectric strength and heat transfer
  • Minimal heat loss
  • Maintained wiring cooler
  • Clean heat
  • Easy service
  • Minimal downtime