ZEHNDER Terraline duct heater with natural convection UN-09-21/1000mm, heating capacity: 276W, grille to be ordered separately UN 09-21/ 1000/ ALUM.NAT

Channel Heater – Discreet Comfort and Efficient Heating

The Zehnder Terraline channel heater is the ideal solution wherever aesthetics and efficiency matter. Its concealed design, with only the frame and grille visible (available as a separate order), blends seamlessly into modern interiors. It utilizes natural convection—the rising of warm air—to provide comfortable and even heating of the room. This makes it an especially effective solution beneath large glazing areas, where traditional radiators may be insufficient.

The Terraline heater is not only about aesthetics but also robust construction. Made from high-quality materials—including a zinc-coated and powder-coated steel casing and a copper-aluminum heat exchanger—it ensures durability and reliability. This makes it suitable for both single-family homes and public buildings.

Construction and Application

The heater’s design combines a sturdy steel casing, providing strength and corrosion resistance, with a highly efficient copper-aluminum heat exchanger. This material combination ensures rapid and effective heat transfer. The heater is rated for a maximum operating pressure of 10 bar and a temperature of 110°C, guaranteeing safe usage.

The Zehnder Terraline is primarily used in spaces where traditional radiators are undesirable or do not fit the interior layout. It performs excellently beneath windows, along walls, or in recesses. Its discreet appearance allows for unrestricted interior design without compromising aesthetics.

Key Features and Benefits

• High Heating Output: The heating power of the UN-09-21/1000mm model is 276W (at ΔT=50°C), ensuring effective heating even in larger rooms.
• Discreet Design: A concealed structure with only the frame and grille visible (available separately) allows the heater to integrate harmoniously into any interior.
• Natural Convection: Provides even heat distribution without noisy fan operation.
• Durable Construction: Made from high-quality steel and copper-aluminum materials, ensuring long-term reliability.
• Versatile Installation: Ideal beneath windows, along walls, or in recesses—adapts effortlessly to various interior layouts.
• Compatibility: Can be integrated with Zehnder Comfosystems, enhancing the overall functionality of the heating installation.
• Grille Frame Width: 215 mm ensures an aesthetically pleasing appearance after grille installation (grille available as a separate order).