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Efficient Heating Solutions: Unveiling the Power of Open Coil Electric Duct Heaters

duct heaterIn many HVAC (Heating, Ventilation, and Air Conditioning) applications, duct heaters are important components because they provide a dependable and effective way to heat the air traveling through a ductwork.

The duct heaters Knape Associates provides are used in industrial and commercial applications. Contact a specialist for more details on custom heaters and the benefits different inline duct heaters offer.

They are created to fit particular surroundings and applications. For example, the modular design of heaters used in air conditioning and air handling units makes it simple to combine them with other parts like fans, cooling sections, and filter boxes.

Continue reading to find out the various heavy-duty applications they meet the requirements for.

Table of Contents

Special Applications

Designed for various special heating applications, including:

Railway and Subway

Designed to endure severe vibration, shock, and voltage swings.

Inline Duct Heaters for Marine Duty Applications

UL-listed duct heaters that are also ABS-approved and meet U.S. Coast Guard Requirements for shipboard use.

Variable Air Volume (VAV) Units

Fully computerized control panel and construction system, which enables rapid production in a wide variety of sizes, ratings, and control options.

Equipment for Wet, Dusty and Corrosive Environments

Custom-built electric duct heaters are available for outdoor, wet, dusty, and corrosive areas, such as rooftop air handling systems (AHU) or marine applications.

Looking for a Specific Duct Heaters?

Contact us now for a quick quote and get the right product the first time!

Inline Duct Heater

Inline duct heaters are an important part of many heating, ventilation, and air conditioning (HVAC) systems. They are made to add extra heat and make sure that the temperature stays the same throughout a network of air ducts.

They are put directly in the ductwork, which is why they are called “inline.” They are especially useful in large commercial or industrial spaces where heat needs to be spread evenly or in homes that need more heat.

They come in many different types and heater assemblies that are made for different uses.

Variants include:

Each is best for different situations, depending on factors such as air quality, the amount of moisture in the air, air flow, the specific heating requirements and even the current air conditioning equipment.

Electric Duct Heaters: Enhancing Temperature Controls in Heavy Duty Environments

In industrial and business settings, electric duct heaters are a key part of temperature control. In addition to warmth, they make sure that the heat is spread evenly across large areas. Electric inline air heaters fit right into the HVAC ducts and provide targeted heating, which is important for different temperature needs.

Versatility and Durability

These heaters are designed to work in wet, dirty, and corrosive areas. They come in different shapes and sizes. They are made of heavy duty materials like stainless steel and galvanized steel and have safety features like thermal holes and thermostats to prevent overheating. Some have substantial heat power, exceeding a hundred kilowatts.

Custom Configurations

Available with thermostatically controlled options and 1-3 kW outputs that are designed to meet vast use cases. Custom duct heaters, including round duct heaters, are designed for installation and adapt to different applications. There are also tubular heating elements available that optimize heat transfer and airflow.

Custom Solutions and Streamlined Heating

Specialized options, such as open coil and supplemental duct-mounted heaters, eliminate the need for complex modifications. We partner with several manufacturers that can provide a custom built and versatile product, from inline units to forced air systems. Integration is easy with components like contactors and fuses.

Efficient Heating for Various Applications

Strategic placement of heat pumps ensure effective heat dispersion in duct systems. Custom-built configurations suit specific requirements, including return air and space heating.

Looking for a Specific Duct Heaters?

Contact us now for a quick quote and get the right product the first time!


Equipment is available with various features, such as:

  • Disconnect switch with door interlock
  • Automatic reset thermal cutout
  • Stainless steel
  • Heavy-duty control transformer
  • Stainless steel terminal hardware

Contact us for information on more features to make sure you get the best heater available.

Various Terminal boxes

  • NEMA 12 Type
  • Bottom Mounted
  • NEMA 4 Type
  • Insulated Terminal Boxes

More are available based on the application requirements.

Safety is a priority, and thus protective screens are often used to prevent accidental contact with electrically hot open coil elements. In terms of construction, heaters can be custom-designed to accommodate lined ducts and various other requirements.

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Supplying Inline Air Heaters

Knape Associates can provide you with fast quotes on the correct inline air heater for your application. We are official representatives of OEM products that covers Texas and beyond. We can also send out a trained specialist to assess the area and make certain the proper equipment is being used for your specific marine application.