The Kartell K-Rad Kompact D709K is a Type 22 double panel, double convector radiator, 750 × 900 mm, giving 1868 W (6373 BTU/h) at ΔT50. Two panels, each backed by its own bank of convector fins, fill a 105 mm case: 1868 W against 1462 W for a Type 21 the same size. Nett weight is 37.8 kg and it holds 6.12 litres of system water.
Type 22 double panel750 × 900 × 105 mm1868 W at ΔT50EN 442 testedWhite enamel RAL 901610-year guarantee
6373 BTU/h
Output at ΔT50 — 1868 W
37.8 kg
Nett weight — holds 6.12 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 750 mm high it needs a clear wall rather than an under-window gap.
Typical job
A room needing roughly 1868 W on a 70 °C mean water temperature, or 2393 W where the system runs at 80 °C. Straight swap for a tired 750 × 900 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 1868 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 962 W from this radiator. Size at the ΔT you will actually run, and step up to a Type 33 where the size allows, or split the load across two radiators.
Key specifications
| Brand |
Kartell |
| Model |
K-Rad Kompact D709K |
| Radiator type |
Type 22 — double panel, double convector |
| Heat output |
| Output at ΔT50 |
1868 W (6373 BTU/h) |
| Output at ΔT60 |
2393 W (8164 BTU/h) |
| Size and weight |
| Dimensions (H × W × D) |
750 × 900 × 105 mm |
| Centre distance |
695 mm |
| Wall to centre |
82.5 or 97.5 mm |
| Weight |
37.8 kg |
| Water content |
6.12 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
Tight on space?
The Type 21 is 70 mm deep and gives 1462 W at ΔT50 — slimmer, but less heat.
View Type 21
Other sizes
Type 22 runs 300–900 mm high and up to 3000 mm wide, from 420 W to 5504 W at ΔT50.
Browse radiators
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