Kartell K-Rad Type 21 Double Panel Single Convector Radiator 600mm x 400mm

Name: Kartell K-Rad Type 21 Double Panel Single Convector Radiator 600mm x 400mm
Brand: Kartell
SKU: P604K
Price: 40.88 GBP
Availability: InStock

by Kartell

SKU P604K

£40.88 - £40.88

£40.88

£40.88 - £40.88

£40.88

Need Help Choosing the Right Radiator?

Calculate the correct BTU output for your room in under a minute.

Calculate Your BTU →

The Kartell K-Rad Kompact P604K is a Type 21 double panel, single convector radiator, 600 × 400 mm, giving 566 W (1932 BTU/h) at ΔT50. Two water-carrying panels with a single bank of convector fins sit in a 70 mm case: 566 W against 380 W for a Type 11 the same size, for 14 mm more depth. Nett weight is 11.68 kg and it holds 2.36 litres of system water.

Type 21 double panel600 × 400 × 70 mm566 W at ΔT50EN 442 testedWhite enamel RAL 901610-year guarantee

1932 BTU/h

Output at ΔT50 — 566 W

11.68 kg

Nett weight — holds 2.36 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. The 600 mm height clears a standard skirting and sits under most window boards.

Typical job

A room needing roughly 566 W on a 70 °C mean water temperature, or 725 W where the system runs at 80 °C. Straight swap for a tired 600 × 400 panel of the same size.

Works with / replaces

Pipe centres are 545 mm with a wall-to-centre of 65 mm or 80 mm, so it lines up with most existing 600 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 566 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 291 W from this radiator. Size at the ΔT you will actually run, and step up to a Type 22 or 33 if the load needs it.

Key specifications

Brand	Kartell
Model	K-Rad Kompact P604K
Radiator type	Type 21 — double panel, single convector
Heat output
Output at ΔT50	566 W (1932 BTU/h)
Output at ΔT60	725 W (2474 BTU/h)
Size and weight
Dimensions (H × W × D)	600 × 400 × 70 mm
Centre distance	545 mm
Wall to centre	65 or 80 mm
Weight	11.68 kg
Water content	2.36 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.