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Katherm NK

Natural convection trench heating.

Katherm NK
Your benefits:
  • Compact, optimised for performance

  • Heat outputs in accordance with DIN EN 16430

  • Minimal dimensions, high outputs

Key features

  • Short delivery times for our standard trenches
  • A matching edge profile for a perfect design with every grille
  • Quick installation with Eurokonus valve fittings, height-adjustment feet and raised floor mounting feet
  • Project solutions are available for all geometries with mitred corners, curved designs, column recesses or chamfered trenches
  •  accessories Katherm module system




  • Effective cold air screening of large windows
  • Unique PowerKon high-performance convector for high outputs
  • Convenient surface- or flush-mounted electrical controller


  • Clear view and feel good temperature in front of full-length glass façades
  • With natural convection for complete room heating, a supplementary heat supply and/or cold air screening
  • 22 length variations, 5 unit widths and 4 unit heights

... also good to know

  • The Katherm NK benefits from the expertise of our in-house Research and Development Center, tailored to customer requirements from the marketplace.
  • The heat outputs were measured and determined in accordance with E DIN EN 16430 "Fan-assisted radiators, convectors and trench convectors" Part 1: "Technical specifications and requirements" and Part 2: "Test method and rating of the heat output."
  • The NK standard lengths can be extended in 200 mm increments from 800 mm to 5000 mm. Lengths that are not available can be created with individual tailor-made units.
Spezial Katherm NK chauffages en caniveau, écran optimisédownload as.pdf, 2,21 MB
Spezial Katherm NK trench heating, screen-optimizeddownload as.pdf, 2,17 MB
Cross-product information
Product overviewdownload as.pdf, 6,08 MB
Overview Katherm Supply Air Versionsdownload as.pdf, 4,07 MB
Installation manuals
Katherm NK trench heatingdownload as.pdf, 6,51 MB
Building product declaration Katherm trench heatingdownload as.pdf, 333,01 KB
BIM data (Building Information Modeling)
BIM datadownload asDownload
Valves and Return shut-off valves

Valve body

suitable for:
Katherm NK 137/182 (trench heights 92 mm and 120 mm)
Katherm HK 320, Katherm HK 290
Article no.:

List price:
28,00 € plus VAT

Pre-setting key

Pre-setting key for valve bodies type 346909, 346910, 346911 and convector valve set type 126103, pre-settable, one required per project
Article no.:

List price:
4,20 € plus VAT

Return shut-off valve

1/2" connection, straight, type 145952
suitable for:
Katherm NK,
Katherm QK,
Katherm HK 320, Katherm HK 340, Katherm HK 290
Article no.:

List price:
15,00 € plus VAT
Surcharge for mitres

90° roll-up grille

Article no.:

List price:
395,00 € plus VAT

Roll-up grille, other angles

Article no.:

List price:
458,00 € plus VAT

90° linear grille

Article no.:

List price:
267,00 € plus VAT

Linear grille, other angles

Article no.:

List price:
307,00 € plus VAT
Installation covers

Wooden installation cover

to protect trench during installation, factory-fitted, grilles are packed separately
Article no.:

List price:
8,00 € / m
plus VAT
Can Katherm NK also be used with low water temperatures?

Yes, depending on the nominal heat load in the room. Because the NK is available in such a wide range of sizes, it is possible to use units with temperatures as low 45/35degC effectively. However, if the space is not available to accommodate larger units when using lower water temperatures, it is worth considering the Katherm QK as a more compact alternative solution.

Where can Katherm NK be used?

To operate more effectively, Katherm NK should be installed directly in front of cold glazing where they can provide cold air screening and also provide supplementary heat. If the nominal heat load is appropriate, they can also be used to provide primary heating for the entire space.

What is the free area of the grilles with Katherm NK?

The Katherm NK grilles are designed in such a way that they always a free grille area of approx. 65% in terms of heat output.