ZEHNDER Terraline duct convector radiator with natural convection UN-11-21/1000mm, heating capacity: 285W, grille to be ordered separately UN 11-21/ 1000/ ALUM.NAT

The channel heater is a discreet and efficient heating solution, ideal for spaces with large glazing or where traditional radiators do not fit the interior design. The Zehnder Terraline UN-11-21/1000mm model utilizes natural convection to provide comfortable and even heat distribution. Its hidden construction ensures that only an elegant grille is visible, which can be customized to match individual interior styles.

The heater’s design is based on a robust steel casing coated with a durable powder finish and a high-efficiency heat exchanger made from an aluminum-copper combination. This material synergy ensures rapid heating and effective heat transfer to the surrounding environment. The heater is designed for operation at a maximum pressure of 10 bar and a temperature of 110°C, guaranteeing reliability and long-term performance. With a heating output of 285W (according to EN 442 standard for ΔT=50°C), it effectively heats the space.

Zehnder Terraline offers not only efficiency but also ease of installation and use. Discreetly concealed connections simplify integration with existing heating systems, while the option to control temperature via a room thermostat or capillary thermostat ensures precise regulation. Additionally, the heater operates silently, making it an ideal solution for bedrooms or living rooms. Note that the grille for the heater is sold separately and requires a separate order—this provides full flexibility in selecting a grille pattern and material to match the interior décor.

• Efficiency: Aluminum-copper heat exchanger ensures rapid room heating.
• Discretion: Hidden construction with only a decorative frame and grille visible blends seamlessly into interior design.
• Comfort: Silent operation ensures uninterrupted user comfort.
• Versatility: Ability to customize the decorative grille to suit individual aesthetic preferences.
• Durability: Robust construction using high-quality materials ensures long-term service life.
• Flexibility: Temperature control via room thermostat or capillary thermostat.

The Terraline heater performs excellently in a wide range of applications—from single-family homes to offices and commercial buildings. It is especially recommended for spaces with large glazing, where traditional radiators may obstruct daylight access or disrupt interior aesthetics. Thanks to its discreet design and high efficiency, it serves as an ideal alternative to conventional convectors or underfloor heating in locations where the latter is difficult or impossible to install. The frame width is 215 mm and the height is 110 mm, enabling easy selection of a compatible decorative grille.