Electric Heaters/

Duct Heaters

A duct heater is a heavy duty modular unit installed in the ventilating ductwork of commercial, residential and institutional HVAC systems, although smaller "duct" heating elements are used in the forced air heating systems of vehicles. Duct heaters can be complementary to a central heating system that utilizes forced air heating, also known as forced circulation heating or convection heating, where air is the medium that transfers heat. Fans and blowers are integral to the transfer of heat; their motion conveys the air through the duct heater.

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Hotwatt, Inc.
Danvers, MA
978-777-0070
Since 1952, we've been dedicated to providing complete quality electric heater systems to industries such as medical, commercial and military. At Hotwatt, air heaters, circulation heaters, immersion heaters, duct heaters and many more quality systems are all designed for your specific electric heater requirements. Contact us today and we will help you to find the heaters and accessories you need.
 
Thermal Devices
Mt. Airy, MD
800-282-9100
From air heaters to circulation heaters, whether you are looking for immersion heaters, duct heaters, or coil heaters, Thermal Devices is the place to go. Specializing in the sale and application of electric heaters and accessories, our team can meet all your needs from our wide range of readily available styles and designs. Call us today with your questions, or visit our website to order online.
 
Watlow Electric Manufacturing Company
St. Louis, MO
800-WATLOW2
Look no further for high quality innovative solutions to your custom electric heater needs. Founded in 1922, Watlow Electric designs and manufactures superior air heaters, circulation heaters, immersion heaters, duct heaters and more to meet your specific needs. Family-owned Watlow has grown considerably since its beginning and is now a successful global distributor of electric heating products.
 
Chromalox
Pittsburgh, PA
800-443-2640
For more than 90 years, customers have relied on Chromalox for superior commercial & industrial heating solutions. We manufacture the world's largest & broadest line of electric heat and control products, including heating components, immersion heaters, circulation systems, heat transfer systems, boilers, industrial & comfort air heating, heat trace cables, sensors & precision electronic controls.
 
Intek Corporation
Union, MO
800-387-8559
Intek Corporation is the answer when it comes to electric/gas fired industrial ovens & industrial heaters, heating elements, infrared heating elements & flash dryers. Quicksilver® Industrial Heater Modules for process heating, Stealth™ Personal Space Heaters, Intek electric infrared heaters, infrared ovens & drying ovens, are some products offered. We can also customize to meet your needs.
 
Solaronics, Inc.
Rochester, MI
800-223-5335
Our leading gas-fired infra-red heaters offer complete solutions for industrial, recreational & commercial buildings. For over 40 years, Solaronics, an infrared heater manufacturer & OEM supplier, has offered heaters that are preferred by architects, engineers, HVAC contractors & building owners when constructing or renovating. Choose from tube heaters, radiant gas heaters, outdoor heaters & more.
 
Detroit Radiant Products Company
Warren, MI
800-222-1100
Since 1955, Detroit Radiant Products has been a premier infrared heater manufacturer. Our product listing includes electric infrared heaters, infrared gas tube heaters, portable heaters, radiant infrared heaters & much more. Our Re-Verber-Ray® line is the most trusted infrared heater worldwide & offers a variety of indoor & outdoor applications. We are committed to providing quality products!
 
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Industry Information

Duct Heaters

Duct heaters work with existing central forced-air heating systems to preheat fresh air or returned air. The central air handler filters the air, re-heats it and blows it through the ductwork. The conditioned air is distributed throughout the building and is then returned to the central air handling unit (AHU). Electric heater manufacturers generally construct duct heaters in rectangular or square box configurations, but they can create rounded ones for the best fit in certain sheet metal ductwork. Consisting of two major components, the heating elements and the electric terminal within the boxed framework, duct heaters can be bottom mounted, flange mounted, round collar mounted or slip-in and are easily installed in existing or new HVAC systems, with the heater control panel mounted in any convenient location.

The two types of heating elements used in duct heaters are open coil and tubular (standard and finned), each offering certain advantages. Open coil elements are coils of nickel chrome wire that are very popular due to excellent heat dissipation; however, tubular elements are more suited to demanding environments as they are sheathed with protective covers of metals such as aluminum, iron, stainless steel or steel. Because of their sheathes, tubular elements are slower to respond but can hold up to humid and dusty atmospheres, and fins are used to help more quickly distribute the heat. Sheathed elements, especially finned varieties, offer a very long life with less maintenance and lower risk of fire and electric shock. Choosing the right heating element, electrical components and controls is essential to achieving the highest economy and efficiency from a duct heater. Temperature sensing duct heaters can be encoded to regulate electric heat output based on a desired temperature, and modulating controllers can allow successful duct heater operation in even extremely low air flow. Plus, electronic enclosures act as moisture/debris resistant and explosion proof housings.

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Duct Heaters Image Provided by Watlow Electric Manufacturing Company