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Kartell K - Rad Type 11 Single Panel Single Convector Radiator 400mm x 400mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 400mm x 400mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 400mm x 400mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 400mm x 400mm - Getplumb

Kartell K-Rad Type 11 Single Panel Single Convector Radiator 400mm x 400mm

by Kartell
SKU S404K
£19.49 - £19.49
£19.49
£19.49 - £19.49
£19.49

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The Kartell K-Rad Kompact S404K is a Type 11 single panel, single convector radiator, 400 × 400 mm, giving 270 W (921 BTU/h) at ΔT50. A single water-carrying panel with one bank of convector fins in a 56 mm case — the slimmest panel in the Kompact range, and the easiest to fit alongside pipework, furniture and door swings. Nett weight is 4.6 kg and it holds 0.84 litres of system water.

Type 11 single panel400 × 400 × 56 mm270 W at ΔT50EN 442 testedWhite enamel RAL 901610-year guarantee
921 BTU/h
Output at ΔT50 — 270 W
4.6 kg
Nett weight — holds 0.84 l
EN 442
Tested and certified
10 years
Manufacturer guarantee

Applications & suitability

Where it goes
Wall-hung on a sealed or open-vented wet heating system, fixed no lower than 100 mm off the finished floor. At 400 mm high it suits a wall where vertical space is tight.
Typical job
A room needing roughly 270 W on a 70 °C mean water temperature, or 346 W where the system runs at 80 °C. Straight swap for a tired 400 × 400 single panel of the same size.
Works with / replaces
Pipe centres are 345 mm with a wall-to-centre of 40 or 55 mm, so it lines up with most existing 400 mm-high panels. Case depth is 56 mm against 70 mm for a Type 21 and 105 mm for a Type 22.
When not to choose this
The 270 W figure is at ΔT50. Run a heat pump at low flow temperatures and it falls hard — Kartell’s own correction factor at ΔT30 is 0.515, so you would get about 139 W from this radiator. Size at the ΔT you will actually run, and step up to a Type 21 or Type 22 at the same size if the load needs it.

Key specifications

Brand Kartell
Model K-Rad Kompact S404K
Radiator type Type 11 — single panel, single convector
Heat output
Output at ΔT50 270 W (921 BTU/h)
Output at ΔT60 346 W (1180 BTU/h)
Size and weight
Dimensions (H × W × D) 400 × 400 × 56 mm
Centre distance 345 mm
Wall to centre 40 or 55 mm
Weight 4.6 kg
Water content 0.84 l
Build and rating
Max working pressure 10 bar
Max working temperature 120 °C
Finish White enamel, RAL 9016
Standard EN 442
Warranty 10 years

Installation & compatibility

Fix no lower than 100 mm from the finished floor. Allow 35 mm from the wall to pipe centre for a manual valve, or 45 mm for a TRV. Kartell requires the system to be cleansed and dosed with inhibitor to BS 7593:2019 — skipping it invalidates the guarantee, which covers product replacement only. Leave the protective packaging on until the radiator is fixed and the tappings are cut.

Related & next steps

Need more output?
The Type 22 at the same 400 × 400 mm gives 533 W at ΔT50, in a 105 mm case.
View Type 22
A middle step?
The Type 21 gives 413 W at ΔT50 in a 70 mm case — more heat for only 14 mm more depth.
View Type 21
Other sizes
Type 11 runs 300–900 mm high and up to 3000 mm wide, from 209 W to 2849 W at ΔT50.
Browse radiators

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