Air duct heaters are vital components in advanced HVAC systems, ensuring thermal comfort across residential, commercial, and industrial environments. These units provide precise control over the temperature of the supply air, contributing to a stable indoor climate and enhanced energy efficiency. At Alnor, we manufacture a wide range of reliable and high-performing duct heaters engineered to meet the demanding requirements of modern ventilation systems.
What Are Electric Duct Heaters?
Electric duct heaters—often referred to as electric heater batteries—are heating units installed directly within ventilation ducts, whether round or rectangular. Their main function is to raise the temperature of the air passing through the ductwork. These units typically feature high-efficiency electric heating elements and can serve as both primary and secondary heat sources. Alnor also offers water-based duct heaters for specialized applications.
Key Benefits of Duct Heaters
Precise temperature regulation for enhanced comfort and control.
Effortless integration with both new and retrofit HVAC systems.
Zonal heating support, enabling targeted temperature management.
Long-lasting performance with robust construction and minimal maintenance.
Zero local emissions with electric models, supporting clean indoor air quality.
Fast thermal response, adapting quickly to fluctuating temperature demands.
Applications of Air Duct Heaters
Duct heaters from Alnor are designed for versatile use across a range of ventilation setups:
As the primary heat source in small-scale mechanical ventilation systems.
As secondary heaters in systems incorporating air conditioning or heat recovery.
Integrated as AHU heater batteries for pre-heating or reheating air.
For zonal temperature control in Variable Air Volume (VAV) systems.
To provide frost protection for heat exchangers in recuperation units.
In industrial duct heating for process air applications.
Choosing the Right Duct Heater
Selecting the optimal duct heater requires attention to several technical aspects:
Required heating capacity (kW) based on airflow rate and target temperature increase.
Duct size and shape compatibility to ensure proper installation.
Electrical specifications including voltage and phase.
Control options such as on/off, 0–10V modulation, or multi-stage settings.
Thermal protection features, including automatic and manual reset mechanisms.
Environmental conditions at the installation site (temperature, humidity).
For unique project requirements, Alnor provides custom duct heaters built to specification.
Technical Specifications & Compliance
Every Alnor duct heater is designed to meet strict quality and safety standards:
Material composition: Durable casings with stainless steel or galvanized elements.
Performance range: Available in various power outputs and dimensional formats.
Built-in safety: Thermal cut-outs with automatic or manual reset for overload protection.
IP protection class tailored to usage environment.
Easy-to-connect interfaces for electrical and ductwork integration.
Certified compliance with LVD, EMC directives, and CE marking.
Why Choose Our Duct Heaters?
As a leading ventilation systems manufacturer with over 30 years of experience, Alnor delivers:
Certified quality and operational reliability
A broad portfolio of standard and custom models
Premium materials and advanced thermal protection systems
Seamless compatibility with Alnor's HVAC components
Dedicated technical assistance for tailored system integration
Choose Alnor duct heaters to ensure efficient, safe, and scalable heating performance across your HVAC installations. Contact us today for expert guidance or to request a custom configuration tailored to your system's needs.
