ZEHNDER Terraline convector radiator with natural convection UN-11-21/1800mm, heating capacity: 637W, grille to be ordered separately UN 11-21/ 1800/ ALUM.NAT

Zehnder Terraline Channel Heaters – Discreet Thermal Comfort

The Zehnder Terraline channel heater is the ideal solution for spaces where aesthetics and efficient heat distribution matter. Thanks to its design, this heater performs exceptionally well when paired with large glazing, creating an invisible air curtain that minimizes heat loss. The system delivers not only thermal comfort but also a discreet appearance—once installed, only the elegant frame and selected grille are visible.

The Terraline heater consists of a durable steel housing and a high-efficiency heat exchanger made from an aluminum-copper combination. This material pairing ensures rapid heating and effective heat exchange. The unit operates quietly and invisibly, making it an ideal choice for living rooms, offices, or public spaces. Note: As of April 1, 2020, the grille for the Terraline heater must be ordered separately, allowing full customization of the unit’s appearance.

Design and Application

Zehnder Terraline is a heating system based on natural air convection. Heat spreads evenly throughout the room, providing pleasant thermal comfort without drafts. These heaters are designed for floor-mounted installation and can be connected into longer runs or custom-made to order. Available lengths range from 800 mm to 4800 mm, enabling perfect adaptation to the specific requirements of any interior.

Pay attention to the possibility of integrating Terraline heaters with Zehnder’s air distribution system, allowing comprehensive climate management throughout the building. Maximum operating pressure is 10 bar, and maximum operating temperature is 110°C, ensuring reliable long-term performance. The heating output of this model (UN-11-21/1800mm) is 637 W at ΔT = 50°C.

Grille and Frame Selection – Personalization for Your Interior

The key aesthetic element of the Terraline heater is the choice of decorative grille. Available options include linear grilles (aluminum) and rolled grilles (also aluminum or stainless steel), as well as flexible grilles on a synthetic backing. This allows the heater’s appearance to be perfectly matched to your interior style and personal preferences. Additionally, decorative frames in J-type or L-type (so-called “parquet overlay”) are available, further enhancing the unit’s aesthetics and simplifying installation on various floor types. Frames are offered in the following colors: natural aluminum, black, and brown.