• Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection
  • Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection
  • Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection
  • Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection
  • Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection
  • Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection

Systemair CB 355-9.0 Circular Duct Heater – 9kW Electric Heater Battery, 400V 3-Phase, 355mm Round Ventilation Duct Heater with Overheat Protection

Regular price £624.94
£624.94
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Description
  • High-Performance Heating Output – Provides 9kW heating capacity designed for ventilation ducts with a minimum airflow requirement of 550 m³/h for efficient air heating.
  • Durable Industrial Construction – Built with Aluzinc-coated steel housing and stainless steel heating elements, ensuring corrosion resistance and long operational life.
  • Integrated Overheat Protection – Includes built-in overheating protection with manual reset, offering reliable safety during operation.
  • Flexible Installation Options – Can be installed in horizontal or vertical duct systems, allowing easy integration into various HVAC configurations.
  • Airtight Duct Connection – Equipped with rubber-sealed spigots that help ensure secure, leak-resistant connections to standard spiral ducts.

The Systemair CB 355-9.0 Circular Duct Heater is a powerful and reliable electric heater battery designed for installation in standard spiral ventilation ducts. Manufactured from durable Aluzinc-coated sheet steel with a stainless steel heating element, this heater ensures efficient and consistent air heating in ventilation systems. It features integral overheating protection with a manual reset function for enhanced safety and long-term reliability. The unit includes rubber seals on the connecting spigots to ensure secure and airtight duct connections. Designed to operate with room thermostats or pulser controllers, the heater requires a minimum airflow based on 1.5 m/s air velocity and delivers a maximum output air temperature of 50°C. Suitable for both horizontal and vertical duct installations, the connection box should face upward or sideways when installed horizontally. This duct heater is ideal for maintaining controlled airflow heating in commercial and industrial HVAC systems.


  • Brand: Systemair
  • Model: CB 355-9.0
  • Product Code: 5389
  • Product Type: Circular Duct Heater / Electric Heater Battery
  • Heating Capacity: 9 kW
  • Voltage: 400V
  • Phase: 3-Phase
  • Frequency: 50/60 Hz
  • Duct Diameter: 355 mm
  • Minimum Airflow: 550 m³/h
  • Maximum Output Air Temperature: 50°CMaterial: Aluzinc Coated Sheet Steel Housing with Stainless Steel Heating Element
  • Colour: Metallic Silver / Steel Finish
  • Installation: Horizontal or Vertical Duct Mounting
  • Dimensions: 355 mm Duct Connection Diameter
  • Weight: 7.5 kg

Our team will ship your order within 5 business days. The time it takes to receive your order depends on the shipping method chosen at checkout. 

We hope you will love it, but if you need to make a return, breathe easy. Returns are always free and can be done via. our support team.


Your purchase includes a 2-year Veralis warranty, offering complete assurance in the quality and longevity of your product. From internal components to craftsmanship and performance, every part of your device is protected. Should you experience any issue during everyday use, our dedicated support team will provide quick and reliable assistance, ensuring you receive a seamless solution with minimal disruption to your comfort.


  • Whisper-Quiet Operation

    Enjoy cleaner air and consistent comfort without any distracting noise.

  • Precision Airflow Engineering

    Enjoy clean, balanced comfort throughout your space.

  • Smart Energy Optimisation

    Our systems automatically adjust their output when needed

  • Built For Modern Living

    Beautiful to look at, effortless to use, and engineered to last.

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