The Kartell K-Rad Kompact S310K is a Type 11 single panel, single convector radiator, 300 × 1000 mm, giving 523 W (1784 BTU/h) at ΔT50. 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 8.6 kg and it holds 1.7 litres of system water.
Type 11 single panel300 × 1000 × 56 mm523 W at ΔT50EN 442 testedWhite enamel RAL 901610-year guarantee
1784 BTU/h
Output at ΔT50 — 523 W
8.6 kg
Nett weight — holds 1.7 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 300 mm high it tucks under low sills and full-height glazing.
Typical job
A room needing roughly 523 W on a 70 °C mean water temperature, or 670 W where the system runs at 80 °C. Straight swap for a tired 300 × 1000 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 523 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 269 W from this radiator. Size at the ΔT you will actually run, and step up to a Type 21 or Type 22 at the same size if the load needs it.
Key specifications
| Brand |
Kartell |
| Model |
K-Rad Kompact S310K |
| Radiator type |
Type 11 — single panel, single convector |
| Heat output |
| Output at ΔT50 |
523 W (1784 BTU/h) |
| Output at ΔT60 |
670 W (2286 BTU/h) |
| Size and weight |
| Dimensions (H × W × D) |
300 × 1000 × 56 mm |
| Centre distance |
245 mm |
| Wall to centre |
40 or 55 mm |
| Weight |
8.6 kg |
| Water content |
1.7 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
Need more output?
The Type 22 at the same 300 × 1000 mm gives 1049 W at ΔT50, in a 105 mm case.
View Type 22
Other sizes
Type 11 runs 300–900 mm high and up to 3000 mm wide, from 209 W to 2849 W at ΔT50.
Browse radiators
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