K Rad Type 21 white 1100mm horizontal radiator fitted in a modern downstairs toilet with beige wall tiles, chrome valves and matching tiled flooring.

K Rad Type 21 Central Heating Radiator 1100mm Wide White

400mm High

£129.99

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K Rad Type 21 Central Heating Radiator 1100mm Wide White

£129.99

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Buy 2 Save £10 | Buy 3 Save £15 | Buy 4 Save £20 — Automatically Applied At Checkout

The K Rad Type 21 Central Heating Radiator combines efficient heating performance with a clean, contemporary design suitable for living rooms, bedrooms, kitchens and other areas of the home. Its double panel and single convector construction provides excellent warmth while maintaining a slimmer profile than a Type 22 radiator. Finished in durable gloss white RAL 9016, it complements both modern and traditional interiors.

Available in three heights of 400mm, 500mm and 600mm, this 1100mm wide radiator offers heat outputs from 4,959 to 6,805 BTU at ΔT60, allowing you to choose the right size for your room. Factory fitted top grilles and side panels provide a neat finish, while wall mounting brackets and installation fixings are included. Suitable radiator valves are required and sold separately

Type 21 Double Panel & Single Convector Design
1100mm Wide With 400mm, 500mm & 600mm Height Options
Heat Outputs From 4,959 To 6,805 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 1100mm Wide White

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

Measuring 1100mm wide, this horizontal radiator is available in three heights to suit different heating requirements:

400mm High – 4,959 BTU at ΔT60

500mm High – 5,925 BTU at ΔT60

600mm High – 6,805 BTU at ΔT60

Each radiator features factory fitted top grilles and side panels for a neat, finished appearance.

Installation & What's Included

The radiator is supplied with wall mounting brackets, fixing bolts, vents and plugs for installation. Its double panel and single convector construction offers a practical balance of heat output and overall depth.

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

Radiator valves are required and sold separately.

Multi Buy Radiator Savings

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Mix qualifying radiator types, sizes and heights to suit different rooms. Savings are applied automatically at checkout.

Each radiator comes with a 10 year guarantee and free delivery to eligible UK mainland addresses.

Dimensions & Specifications

Product Specification
Specification 400mm High 500mm High 600mm High
Brand K Rad K Rad K Rad
Range Type 21 Type 21 Type 21
Manufacturer SKU P411K P511K P611K
Barcode 5060168221759 5060168221896 5060168222039
Radiator Type Type 21 Type 21 Type 21
Configuration Double Panel, Single Convector Double Panel, Single Convector Double Panel, Single Convector
Width 1100mm 1100mm 1100mm
Height 400mm 500mm 600mm
Heat Output ΔT60 4,959 BTU 5,925 BTU 6,805 BTU
Product Weight 20.05kg 24.47kg 30.17kg
Tapping Centres 1100mm 1100mm 1100mm

Additional Specifications
Specification Details
Orientation Horizontal
Mounting Wall Mounted
Material Mild Steel
Colour White
Finish Gloss White RAL 9016
Maximum Operating Pressure 10 Bar
Maximum Operating Temperature 120°C
Top Grille & Side Panels Factory Fitted
Wall Mounting Brackets Included
Installation Bolts & Fixings 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.