The Kartell K-Rad Kompact S420K is a Type 11 single panel, single convector radiator, 400 2000 mm, giving 1349 W (4604 BTU/h) at T50. 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. At 2000 mm wide it is a long radiator check the run of clear wall before ordering.
Type 11 single panel400 2000 56 mm1349 W at T50EN 442 testedWhite enamel RAL 901610-year guarantee 4604 BTU/h Output at T50 1349 W 23 kg Nett weight holds 4.2 l EN 442 Tested and certified 10 years Manufacturer guarantee
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 1349 W on a 70 C mean water temperature, or 1729 W where the system runs at 80 C. Straight swap for a tired 400 2000 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 1349 W figure is at T50. Run a heat pump at low flow temperatures and it falls hard Kartells own correction factor at T30 is 0.515, so you would get about 695 W from this radiator. Size at the T you will actually run, and step up to a Type 21 or Type 22 at the same size if the load needs it.
| Brand | Kartell |
| Model | K-Rad Kompact S420K |
| Radiator type | Type 11 single panel, single convector |
| Heat output | |
| Output at T50 | 1349 W (4604 BTU/h) |
| Output at T60 | 1729 W (5898 BTU/h) |
| Size and weight | |
| Dimensions (H W D) | 400 2000 56 mm |
| Centre distance | 345 mm |
| Wall to centre | 40 or 55 mm |
| Weight | 23 kg |
| Water content | 4.2 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 |
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.
Need more output? The Type 22 at the same 400 2000 mm gives 2665 W at T50, in a 105 mm case. View Type 22 A middle step? The Type 21 gives 2063 W at T50 in a 70 mm case more heat for only 14 mm more depth. View Type 21 Other sizes Type 11 runs 300900 mm high and up to 3000 mm wide, from 209 W to 2849 W at T50. Browse radiators
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