ZEHNDER Terraline convector radiator with natural convection UN-11-34/1000mm, heating capacity: 434W, grille to be ordered separately UN 11-34/ 1000/ ALUM.NAT

The Zehnder Terraline duct heater is a discreet and efficient heating solution, ideal for both modern and traditional interiors. It utilizes natural convection—the rising of warm air—to provide thermal comfort without unnecessary noise. This is especially beneficial in spaces with large glazing, where it helps counteract temperature drops caused by cold air descending from windows.

The heater’s construction is based on a robust steel casing coated with a durable powder finish and a high-efficiency heat exchanger made from aluminum-copper combination. This material pairing ensures rapid heating and effective heat distribution throughout the room. The UN-11-34/1000mm model, with a heating output of 434W, is designed for installation beneath windows or along exterior walls. Note that the decorative grille is not included in the set and must be purchased separately, allowing full customization of the heater’s appearance to match individual preferences.

Design features and applications

The Terraline heater features a low-profile design, making it nearly invisible when installed. Only the frame and the selected decorative grille remain visible—available in various patterns and materials (aluminum, wood, stainless steel). The option to choose different grilles enables seamless integration into any interior. Additionally, this heater performs excellently in low-temperature heating systems and when paired with heat pumps, making it an eco-friendly and cost-effective heating solution.

The use of an aluminum-copper heat exchanger results in a fast response to temperature changes, ensuring stable thermal comfort. The heater operates silently and invisibly, while its design allows easy access to installation components during servicing. The maximum operating pressure is 10 bar, and the operating temperature is 110°C—parameters that guarantee safe and reliable long-term use. The grille frame width is 340 mm, and the height is 110 mm.