ZEHNDER Terraline duct heater with natural convection UN-11-21/2000mm, heating capacity: 724W, grille to be ordered separately UN 11-21/ 2000/ ALUM.NAT

The Zehnder Terraline duct heater is a discreet and efficient heating solution, ideal for spaces with large glazing. Its design, based on natural convection, ensures even heat distribution, creating a comfortable microclimate. The heater consists of a durable steel casing and a highly efficient heat exchanger made of aluminum and copper, seamlessly integrating into interior décor—only the elegant frame and grille are visible (these must be purchased separately).

The Terraline heater’s construction allows flexible adaptation to specific needs: models are available in various lengths, and multiple units can be connected to form longer runs. This makes it suitable for both new constructions and retrofitting existing systems. Supply and return connections can be swapped freely, simplifying installation.

Key Features and Applications

The Terraline heater features rapid heating and silent operation. Its hidden heating system preserves interior aesthetics, making it an ideal choice for those who value minimalist design and functionality. It can be installed in a variety of rooms—from living rooms and offices to children’s rooms and bathrooms.

Note the option to choose from different decorative grille types (sold separately)—linear or curved, made of aluminum, wood, or stainless steel—enabling full customization of the heater’s appearance. Additionally, J- or L-type frames are available to match the character of floor finishes.

The Terraline heater operates at a maximum working pressure of 10 bar and a maximum operating temperature of 110°C, ensuring reliability and durability. The heating output of this model (at ΔT = 50°C) is 724 W. The frame and grille dimensions are 2000 mm in length, 215 mm in width, and 110 mm in height.