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…
Leading Manufacturers
Backer Hotwatt, Inc.
Danvers, MA | 978-777-0070Backer Hotwatt is a superior designer & manufacturer of electric heaters and related heater accessories for various OEM & industrial applications.
Ulanet™
Columbus, IN | 812-372-0281For 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.
ASB Heating Elements, Ltd.
Toronto, ON | 800-265-9699ASB has more than 25 years of experience in the manufacturing of heating elements and replacement electric heating elements for furnaces used in the thermal processing industries. These elements include silicone carbide, ceramic and edge wound ribbon, plus more.
Power Modules Inc.
Havertown, PA | 800-437-4328At Power Modules, we offer a variety of process heating products, including heating elements, controllers, heat sensors, radiant arrays, high-temperature wire and other accessories. Our heating elements include tubular heaters, cartridge heaters, band heaters, ceramic heaters, flexible heaters, and other specialty heating elements.
Hi-Heat Industries, Inc.
Lewistown, MT | 406-538-7411Hi-Heat designs and manufactures custom heating elements from a variety of materials. Our products include Silicone Rubber, Polyester Film, Kapton® Polyimide, High Temperature, Mica, Ceramic and Enclosures Heaters. We manufacture drop-in sub-assemblies with sensors, thermostats, fuses, cords and plugs.
Cartridge Heater with Armored Lead Wires - Thermal DevicesElectric 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 - Thermal DevicesThe 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.