Electric Duct Heaters

An electric duct heater warms the air flowing through HVAC or process ducts. Air passes over resistance heating elements, which transfer heat to the airflow. Temperature sensors and controllers regulate the heat, while safety devices prevent operation without airflow or overheating.

These heaters are highly efficient because nearly all electricity converts to heat. They integrate easily into existing ductwork, require little maintenance, and respond quickly. They provide clean, reliable heat for supplemental, auxiliary, or precise process heating without the need for combustion or fuel lines.

They are commonly used in commercial HVAC and industrial processes. Typical applications include make-up air, VAV reheat, emergency heating, equipment drying, and humidity control. Their flexibility allows use in offices, hospitals, clean rooms, and manufacturing facilities wherever controlled, reliable heated airflow is needed.

A combination of temperature sensors, limit switches, and airflow interlocks protects the system. Sensors adjust power to the elements based on air temperature, limit switches shut down the heater if temperatures exceed safe levels, and airflow interlocks prevent operation when air movement is absent, safeguarding the heater and saving energy.

For safe, efficient operation, mount the heater securely in the duct with proper upstream and downstream straight lengths. Ensure electrical connections match the voltage and current requirements, and account for any pressure drop. Adequate clearance, ventilation, and code compliance are essential for long-term performance.

Routine checks keep the system safe and efficient. Inspect electrical connections, heating elements, and sensors, and clean dust or debris from the duct and heater housing. Preventive care helps maintain performance and extends service life.

Consider airflow, duct size, and required temperature rise. Check voltage and power ratings, element configuration, and control features. Safety components like high-limit switches and airflow interlocks should suit your system. Proper selection ensures efficient, reliable heating without overloading your HVAC system.

Electric duct heaters provide clean, efficient heat with precise temperature control and fast response. They are easy to integrate into existing ducts or VAV systems and avoid the maintenance and safety concerns of fuel-fired units. They are a dependable, flexible solution for commercial, institutional, and industrial air heating needs.