The Kartell K-Rad Kompact S304K is a Type 11 single panel, single convector radiator, 300 400 mm, giving 209 W (714 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. Nett weight is 3.44 kg and it holds 0.68 litres of system water.
Type 11 single panel300 400 56 mm209 W at T50EN 442 testedWhite enamel RAL 901610-year guarantee 714 BTU/h Output at T50 209 W 3.44 kg Nett weight holds 0.68 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 300 mm high it tucks under low sills and full-height glazing. Typical job A room needing roughly 209 W on a 70 C mean water temperature, or 268 W where the system runs at 80 C. Straight swap for a tired 300 400 single panel of the same size. Works with / replaces Pipe centres are 245 mm with a wall-to-centre of 40 or 55 mm, so it lines up with most existing 300 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 209 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 108 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 S304K |
| Radiator type | Type 11 single panel, single convector |
| Heat output | |
| Output at T50 | 209 W (714 BTU/h) |
| Output at T60 | 268 W (914 BTU/h) |
| Size and weight | |
| Dimensions (H W D) | 300 400 56 mm |
| Centre distance | 245 mm |
| Wall to centre | 40 or 55 mm |
| Weight | 3.44 kg |
| Water content | 0.68 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 300 400 mm gives 420 W at T50, in a 105 mm case. View Type 22 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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