K Rad Type 21 white central heating radiator, 1800mm wide, wall mounted in a modern kitchen with sage green cabinets, tiled flooring and chrome radiator valves.

K Rad Type 21 Central Heating Radiator 1800mm Wide White

400mm High

£179.00

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K Rad Type 21 Central Heating Radiator 1800mm Wide White

£179.00

The K Rad Type 21 Central Heating Radiator offers powerful, efficient heating 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 generous heat output without the greater depth of a Type 22 radiator, complemented by a durable gloss white RAL 9016 finish.

Available in three heights of 400mm, 500mm and 600mm, all measuring 1800mm wide, this radiator delivers heat outputs ranging from 8,115 to 11,135 BTU at ΔT60. Each radiator comes complete with factory fitted top grilles, side panels, wall mounting brackets and installation fixings. Radiator valves are required and sold separately.

Type 21 Double Panel & Single Convector Design
1800mm Wide Horizontal Central Heating Radiator
Choice Of 400mm, 500mm & 600mm Heights
Heat Outputs From 8,115 To 11,135 BTU At ΔT60
Durable Gloss White RAL 9016 Finish
Factory Fitted Grilles, Side Panels & Installation Fixings Included

Product Description

The K Rad Type 21 Central Heating Radiator combines excellent heat output with a clean, classic panel radiator design. Manufactured from mild steel, its double panel and single convector construction provides effective heating while maintaining a slimmer profile than a Type 22 radiator. Its generous 1800mm width makes it a practical choice for living rooms, kitchens, bedrooms and other spaces requiring a higher heat output.

Finished in durable gloss white RAL 9016 enamel, this horizontal radiator features factory fitted top grilles and side panels for a neat, attractive appearance. Its wall mounted design suits both contemporary and traditional interiors.

Choose Your Radiator Height

All three options measure 1800mm wide, with a choice of heights and heat outputs to suit your available wall space and heating requirements.

400mm High: 8,115 BTU at ΔT60

500mm High: 9,695 BTU at ΔT60

600mm High: 11,135 BTU at ΔT60

Select your preferred height before adding the radiator to your basket.

Installation & What's Included

Each radiator is supplied with wall mounting brackets, fixing bolts, vents and plugs. Factory fitted top grilles and side panels are also included, providing everything needed to securely mount and prepare the radiator for installation.

The radiator is suitable for operating pressures up to 10 bar and maximum operating temperatures of 120°C.

Suitable radiator valves are required and sold separately.

Multi Buy Radiator Savings

Heating more than one room? Bathroom Source Direct offers multi buy savings across qualifying central heating radiators.

Buy Any 2 Radiators & Save £10

Buy Any 3 Radiators & Save £15

Buy Any 4 Radiators & Save £20

Mix different qualifying radiator types and sizes to suit your home.

All three height options include free UK delivery and come with a 10 year guarantee.

Dimensions & Specifications

Specification Details
Brand K Rad
Range Kompact
Product Type Central Heating Radiator
Radiator Type Type 21
Panel Configuration Double Panel
Convector Configuration Single Convector
Orientation Horizontal
Installation Wall Mounted
Material Mild Steel
Colour White
Finish Gloss White RAL 9016
Width 1800mm
Available Heights 400mm, 500mm, 600mm
Radiator Depth 70mm
Wall To Centre 65mm Or 80mm
Maximum Operating Pressure 10 Bar
Maximum Operating Temperature 120°C
Top Grille & Side Panels Factory Fitted
Wall Mounting Brackets Included
Installation Fixings Included
Radiator Valves Not Included
Guarantee 10 Years
Size & Heat Output Specifications
Height SKU BTU ΔT50 BTU ΔT60 Weight
400mm P418K 6,334 8,115 32.81kg
500mm P518K 7,568 9,695 40.04kg
600mm P618K 8,692 11,135 49.37kg

Installation Measurements
Height Vertical Tapping Centres Radiator Depth
400mm 345mm 70mm
500mm 445mm 70mm
600mm 545mm 70mm

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.