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Kartell K - Rad Type 11 Single Panel Single Convector Radiator 500mm x 300mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 500mm x 300mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 500mm x 300mm - Getplumb
Kartell K - Rad Type 11 Single Panel Single Convector Radiator 500mm x 300mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb
Kartell K-Rad Type 22 Double Panel Double Convector Radiator 750mm x 400mm - Getplumb

Kartell K-Rad Type 11 Single Panel Single Convector Radiator 500mm x 300mm

SKU S503K
£41.50 - £41.50
£41.50
£41.50 - £41.50
£41.50

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The Kartell K-Rad Kompact S503K is a Type 11 single panel, single convector radiator, 500 × 300 mm, giving 245 W (835 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 4.32 kg and it holds 0.72 litres of system water.

Type 11 single panel500 × 300 × 56 mm245 W at ΔT50EN 442 testedWhite enamel RAL 901610-year guarantee
835 BTU/h
Output at ΔT50 — 245 W
4.32 kg
Nett weight — holds 0.72 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 500 mm high it suits a wall where vertical space is tight.
Typical job
A room needing roughly 245 W on a 70 °C mean water temperature, or 314 W where the system runs at 80 °C. Straight swap for a tired 500 × 300 single panel of the same size.
Works with / replaces
Pipe centres are 445 mm with a wall-to-centre of 40 or 55 mm, so it lines up with most existing 500 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 245 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 126 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 S503K
Radiator type Type 11 — single panel, single convector
Heat output
Output at ΔT50 245 W (835 BTU/h)
Output at ΔT60 314 W (1070 BTU/h)
Size and weight
Dimensions (H × W × D) 500 × 300 × 56 mm
Centre distance 445 mm
Wall to centre 40 or 55 mm
Weight 4.32 kg
Water content 0.72 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

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 500 × 300 mm gives 478 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
245W / 835 BTU
Heat Output
Type 11
Radiator Type
300 mm
Width
EN442 Certified
Standard

Key features

01

Compact Space-Saving Size

Designed with a narrow 300mm width, making it perfect for tight or restricted spaces.

02

Efficient Heat Output

Provides 245W of consistent heat, ideal for maintaining comfort in smaller rooms.

03

Type 11 Convector Design

Single panel with integrated convector fins enhances heat distribution efficiency.

04

Durable Steel Construction

Manufactured from high-quality steel for long-lasting performance and reliability.

05

Modern Minimalist Appearance

Clean and simple design complements a wide range of interior styles.

06

EN442 Certified Performance

Tested to European standards, ensuring dependable and efficient heating output.

Technical specification

Find all the essential technical information

Product Code
S503K
Brand
Kartell
Range
K-Rad
Radiator Type
Type 11 (Single Panel, Single Convector)
Heat Output (Watts)
245W
Heat Output (BTU)
835 BTU
Delta Rating
ΔT50 (EN442)
Height
500 mm
Width
300 mm
Material
Steel
Installation Type
Wall Mounted
Application
Domestic Heating

Shipping information

Standard delivery

1–3 working days

Free local delivery over £100

Heavy item delivery

34.5kg unit — pallet delivery, please ensure access

£60.00

Store pickup

GetPlumb Reading store — usually ready in 24 hours

Free

Good to know

  • Tracking details sent by email once dispatched
  • Someone needs to be present to receive heavy items
  • Deliveries to Scottish Highlands and offshore may take longer — check at checkout
  • Installation is not included — see our approved installer network

Need more information regarding shipping?

View our complete shipping policy for delivery charges, eligible postcodes, delivery times, exclusions and more.

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Frequently asked questions

What type of radiator is the S503K? +
It is a Type 11 radiator, meaning it has a single panel with one convector for efficient heat output.
Where is this radiator best used? +
It is ideal for small spaces such as bathrooms, hallways, or compact rooms.
What is the heat output of this radiator? +
It provides 245W or 835 BTU at Delta T50, suitable for low to moderate heating needs.
Does it come with radiator valves? +
No, valves such as TRVs and lockshield valves are sold separately.
Is it compatible with standard central heating systems? +
Yes, it is designed to work with most UK domestic central heating systems.
JM RH SP
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