Duct heaters are the heating units generally designed to be installed into ducts. They are fitted to heat the air in the duct as it flows around and through the heating elements (coils or tubes )before it is being circulated. They are for commercial and industrial type applications and are not built to the standards required for the typical residential HVAC. Being one of the leading Duct heater manufacturers in India, we provide them in the desired size (round or rectangular). Depending on the minimum airflow, the surface load will be set.

There are three types of duct heaters available: open coil, tubular element, or finned tubular heating elements that are either flanged or inserted in the duct. Duct heaters can be broadly categorized into two categories: air duct heaters, and process heaters. The main applications for air duct heaters are airflow ventilation systems and comfort heating while process duct heaters are mainly used for industrial process heating applications to temper forced air such as ovens etc. They specialize in handling situations that require forced circulation or recirculation of heat.


  • Air drying
  • Primary, Secondary heating
  • Space heating
  • Reheating
  • Multi-zone heating
  • VAV, Auxiliary heating
  • Fan coils
  • Return air heating

Its numerous industrial applications have allowed the market to innovate and develop an assortment of products for different air heating installation systems. Being one of the eminent Duct heater suppliers in India we offer units that are available for flange mount, round duct, and bottom mount installations.

Configuration types

  • Bottom Mount Duct Heaters

The most common type of duct heater available in the market is the bottom mount duct heater. Controls are easily accessible and don’t require the removal of the heater. The pre-wiring of accessory parts prevents expensive field assembly. They can be easily serviced. Also, in the Bottom Mount Heater, all construction aspects of the Custom Built Heater are integrated.

  • Flanged Mount Duct Heaters

Flanged heaters are constructed with flanges on both ends of the heater frame. They become a section of the duct when installed and provide maximum duct rigidity. The heater flanges and boxes are made-up using heavier galvanized steel. Their design allows unlimited options for duct size match-ups. Also, if one has the exact blower configuration and information about the proper air baffle, these duct heaters can be easily coupled to blower units.

  • Round duct heaters

Round duct heaters are electric heaters that allow for easy installation using a round sheet metal duct. Its installation consists of attaching the round duct to the inlet and outlet collars and bolting it in place.

Whether you are choosing a heater for your new system or just need a spare for a malfunctioning one, our experts will be delighted to assist you. If you have any questions, please don’t hesitate to contact us at Patel heater and control PVT.LTD.