K Rad Type 21 white 900mm horizontal radiator installed in a modern bathroom with beige wall tiles, chrome valves and oak bathroom furniture.

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K Rad Type 21 Central Heating Radiator 900mm Wide White

£114.95

The K Rad Type 21 Central Heating Radiator combines reliable heating performance with a clean, contemporary design suitable for modern and traditional homes. Its double panel and single convector construction provides effective warmth while maintaining a slimmer profile than a Type 22 radiator. Manufactured from mild steel and finished in durable gloss white RAL 9016 enamel, it is a practical choice for bedrooms, living rooms, kitchens and other areas of the home.

Measuring 900mm wide, this radiator is available in three heights of 400mm, 500mm and 600mm, with heat outputs ranging from 4,057 to 5,568 BTU at ΔT60. Factory fitted top grilles and side panels provide a neat appearance, while wall mounting brackets and installation fixings are included. Suitable radiator valves are required and sold separately.

Type 21 Double Panel & Single Convector Design
900mm Wide With Three Height Options
Heat Outputs From 4,057 To 5,568 BTU At ΔT60
Durable Gloss White RAL 9016 Finish
Factory Fitted Top Grille & Side Panels
Wall Mounting Brackets & Installation Fixings Included

Product Description

K Rad Type 21 Central Heating Radiator 900mm Wide White
The K Rad Type 21 Central Heating Radiator offers reliable heating performance in a clean, contemporary design suitable for modern and traditional homes. Manufactured from mild steel, its double panel and single convector construction provides effective warmth while maintaining a slimmer profile than a Type 22 radiator.

Finished in durable gloss white RAL 9016 enamel, this horizontal radiator features factory fitted top grilles and side panels for a neat appearance. Its 900mm width makes it a practical choice for bedrooms, living rooms, kitchens and other areas requiring dependable central heating.
Available Sizes & Heat Outputs
Choose from three heights to suit your room and heating requirements:
- 400mm High x 900mm Wide – 4,057 BTU
- 500mm High x 900mm Wide – 4,847 BTU
- 600mm High x 900mm Wide – 5,568 BTU
All heat outputs are measured at ΔT60 in accordance with EN442.
Installation & What's Included
Each radiator comes complete with wall mounting brackets, fixing bolts, vents and plugs, together with factory fitted top grilles and side panels.

Suitable for central heating systems operating at pressures up to 10 bar and maximum temperatures of 120°C.

Radiator valves are required for installation and are sold separately.
Multi Buy Radiator Savings
Save when purchasing multiple qualifying central heating radiators from Bathroom Source Direct.
- Buy Any 2 Radiators & Save £10
- Buy Any 3 Radiators & Save £15
- Buy Any 4 Or More Radiators & Save £20
Mix qualifying radiator types, widths and heights to suit different rooms throughout your home. Savings are applied automatically at checkout.

Each radiator comes with a 10 year guarantee.

Dimensions & Specifications

Specification 400mm High 500mm High 600mm High
Manufacturer SKU P409K P509K P609K
Barcode 5060168221735 5060168221872 5060168222015
Height 400mm 500mm 600mm
Width 900mm 900mm 900mm
Heat Output ΔT60 4,057 BTU 4,847 BTU 5,568 BTU
Product Weight 16.41kg 20.02kg 24.68kg
Tapping Centres 900mm 900mm 900mm

Additional Specifications
Specification Details
Brand K Rad
Radiator Type Type 21
Panel Configuration Double Panel
Convector Configuration Single Convector
Orientation Horizontal
Material Mild Steel
Colour White
Finish Gloss White RAL 9016
Mounting Wall Mounted
Maximum Operating Pressure 10 Bar
Maximum Operating Temperature 120°C
Top Grille & Side Panels Factory Fitted
Wall Mounting Brackets Included
Fixing Bolts Included
Vents & Plugs Included
Radiator Valves Not Included
Heat Output Standard EN442
Guarantee 10 Years

Radiator Buying Guide (Content Section)

Choosing the Right Radiator Size

Selecting the correct radiator size helps ensure your room heats efficiently and comfortably. The heat output of a radiator is measured in BTU (British Thermal Units) or Watts, which indicate how much heat the radiator can produce.

Smaller rooms such as cloakrooms or en-suites typically require lower heat output, while larger bathrooms and living spaces may require a radiator with a higher BTU rating.

When choosing a radiator, consider:

• Room size – larger rooms require higher heat output

• Ceiling height – higher ceilings may require additional heating capacity

• Insulation levels – well insulated rooms retain heat more effectively

• Window size – rooms with large windows may lose heat more quickly

For best results, choose a radiator with sufficient BTU output to comfortably heat the space.

Radiator Installation

Most modern radiators connect directly to your home's central heating system using standard 1/2" inlet and outlet connections. Installation is similar to fitting a standard household radiator.

Radiators are typically supplied with wall mounting brackets and fixings, while radiator valves are purchased separately to allow you to choose the style and control type that best suits your installation.

For safety and correct operation, radiators should always be installed following manufacturer guidelines.

Radiator Valves

Radiator valves control the flow of hot water entering the radiator and help regulate the room temperature.

Common valve options include:

• Manual valves – simple temperature adjustment

• Thermostatic valves (TRV) – automatically regulate room temperature

• Angled or straight valves – depending on pipe position

Choosing the correct valve type ensures the radiator operates efficiently within your heating system.