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.
Durex Industries
Cary, IL | 866-712-5014Durex Industries is a highly recognized manufacturer and supplier of electric heaters for a variety of industries worldwide. Offering a comprehensive array of heater products, both industry standard, and custom designs. Immersion heaters, circulation heaters, air heaters, cast heaters, flexible heaters, cartridge heaters and more. Contact us today to learn more about how we can provide solutions for you!
TRENT, Inc.
Philadelphia, PA | 215-482-5000TRENT is a leading manufacturer of heating equipment and heating elements for diverse industrial and commercial applications. Our folded and formed ribbon type heating elements meet higher temperature standards. We also offer strip, tubular, cartridge, and ceramic ring heaters and hot plates.
Hazloc Heaters
Calgary, AB | 1-403-730-2488;Toll free:1-866-701-4328(USA & CAN)Hazloc Heaters is a manufacturer of explosion-proof electric heaters, hydronic unit heaters, disconnects switches and room thermostats for hazardous and severe duty locations. Our explosion-proof electric air heaters are available with cCSAus and ATEX/IECEx certifications for North America and Europe.
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.
