Duct Heaters

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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). Read More…

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.

Leading Manufacturers

Danvers, MA  |  978-777-0070

Backer Hotwatt is a superior designer & manufacturer of electric heaters and related heater accessories for various OEM & industrial applications.

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Backer Hotwatt, Inc. $$$

Bristol, CT  |  860-582-6776

For more than 70 years, Ulanet™ has been engineering and manufacturing electric heaters, cartridge heaters, immersion heaters, tubular heaters, miniature strip heaters and bolt hole heaters, as well as industrial heaters and appliance thermostats.

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Ulanet™ $$$

Tucson, AZ  |  800-423-4078

GLO-QUARTZ® is a leading manufacturer of a full line of high-quality industrial heaters, including electric heaters and tubular heaters. GLO-QUARTZ® provides quality and reliable electric heaters and industrial process heating equipment at competitive prices. Call today for more information!

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GLO-QUARTZ® Inc. $$$

Tucson, AZ  |  800-423-4078

GLO-QUARTZ® is a leading manufacturer of a full line of high-quality industrial heaters, including electric heaters and tubular heaters. GLO-QUARTZ® provides quality and reliable electric heaters and industrial process heating equipment at competitive prices. Call today for more information!

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GLO-QUARTZ® Inc. $$$

Johnson City, TN  |  800-682-3398

Manufacturer of highly specified electric heating products for the HVAC market. Specializing in products such as Hazardous Location, Washdown and Cabinet Unit Heaters, Duct Heaters, Wall Heaters, Electric Baseboard and Electric Hydronic Baseboard. The choice of Professionals since 1921.

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Markel Products Company $$$

Grass Valley, CA  |  800-748-6189

Benchmark Thermal designs and manufuactures electric heaters for a broad range of industries, such as petrochemical, medical devices, semiconductor, and food service. Our product listing includes tubular heating elements, silicone rubber heating elements, flexible heating elements, and insulated heaters. Our heating elements can fit your exact specifications.

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Benchmark Thermal $$$
placeholder image Backer Hotwatt, Inc. Ulanet™ GLO-QUARTZ® Inc. GLO-QUARTZ® Inc. Markel Products Company Benchmark Thermal

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.

Duct Heaters Duct Heaters - Thermal Devices

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.

Duct Heater Informational Video