The Kartell K-Rad Kompact P504K is a Type 21 double panel, single convector radiator, 500 400 mm, giving 493 W (1682 BTU/h) at T50. Two water-carrying panels with a single bank of convector fins sit in a 70 mm case: 493 W against 326 W for a Type 11 the same size, for 14 mm more depth. Nett weight is 9.76 kg and it holds 2 litres of system water.
Type 21 double panel500 400 70 mm493 W at T50EN 442 testedWhite enamel RAL 901610-year guarantee 1682 BTU/h Output at T50 493 W 9.76 kg Nett weight holds 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 500 mm high it suits a wall where vertical space is tight. Typical job A room needing roughly 493 W on a 70 C mean water temperature, or 631 W where the system runs at 80 C. Straight swap for a tired 500 400 panel of the same size. Works with / replaces Pipe centres are 445 mm with a wall-to-centre of 65 mm or 80 mm, so it lines up with most existing 500 mm-high panels. Case depth is 70 mm against 56 mm for a Type 11 and 105 mm for a Type 22. When not to choose this The 493 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 254 W from this radiator. Size at the T you will actually run, and step up to a Type 22 or 33 if the load needs it.
| Brand | Kartell |
| Model | K-Rad Kompact P504K |
| Radiator type | Type 21 double panel, single convector |
| Heat output | |
| Output at T50 | 493 W (1682 BTU/h) |
| Output at T60 | 631 W (2154 BTU/h) |
| Size and weight | |
| Dimensions (H W D) | 500 400 70 mm |
| Centre distance | 445 mm |
| Wall to centre | 65 or 80 mm |
| Weight | 9.76 kg |
| Water content | 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 500 400 mm gives 638 W at T50, in a 105 mm case. View Type 22 Tight on space? The Type 11 is 56 mm deep and gives 326 W at T50 slimmer, but less heat. View Type 11 Other sizes Type 21 runs 400900 mm high and 4002200 mm wide, from 413 W to 3114 W at T50. Browse radiators
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