The Kartell K-Rad Kompact D704K is a Type 22 double panel, double convector radiator, 750 400 mm, giving 830 W (2832 BTU/h) at T50. Two panels, each backed by its own bank of convector fins, fill a 105 mm case: 830 W against 650 W for a Type 21 the same size. Nett weight is 16.8 kg and it holds 2.72 litres of system water.
Type 22 double panel750 400 105 mm830 W at T50EN 442 testedWhite enamel RAL 901610-year guarantee 2832 BTU/h Output at T50 830 W 16.8 kg Nett weight holds 2.72 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 750 mm high it needs a clear wall rather than an under-window gap. Typical job A room needing roughly 830 W on a 70 C mean water temperature, or 1063 W where the system runs at 80 C. Straight swap for a tired 750 400 panel of the same size. Works with / replaces Pipe centres are 695 mm with a wall-to-centre of 82.5 or 97.5 mm, so it lines up with most existing 750 mm-high panels. Case depth is 105 mm against 70 mm for a Type 21 and 160 mm for a Type 33. When not to choose this The 830 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 427 W from this radiator. Size at the T you will actually run, and step up to a Type 33 where the size allows, or split the load across two radiators.
| Brand | Kartell |
| Model | K-Rad Kompact D704K |
| Radiator type | Type 22 double panel, double convector |
| Heat output | |
| Output at T50 | 830 W (2832 BTU/h) |
| Output at T60 | 1063 W (3628 BTU/h) |
| Size and weight | |
| Dimensions (H W D) | 750 400 105 mm |
| Centre distance | 695 mm |
| Wall to centre | 82.5 or 97.5 mm |
| Weight | 16.8 kg |
| Water content | 2.72 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.
Tight on space? The Type 21 is 70 mm deep and gives 650 W at T50 slimmer, but less heat. View Type 21 Other sizes Type 22 runs 300900 mm high and up to 3000 mm wide, from 420 W to 5504 W at T50. Browse radiators
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