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Type 21 Radiators (Double Panel/Single Convector)

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Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White Save up to 82% Save %
£1,128.70 - £1,146.70
£1,128.70 - £1,146.70
£1,128.70
£202.99 - £211.99
£202.99 - £211.99
£202.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 2200mm White (P422K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 2200mm wide is the widest in the 400mm Type 21 range — a substant...

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£1,128.70 - £1,146.70
£1,128.70 - £1,146.70
£1,128.70
£202.99 - £211.99
£202.99 - £211.99
£202.99
Save up to 82% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White Save up to 82% Save %
£1,026.08 - £1,044.08
£1,026.08 - £1,044.08
£1,026.08
£183.99 - £192.99
£183.99 - £192.99
£183.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 2000mm White (P420K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 2000mm wide is an extra-wide, high-output heater built for large ...

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£1,026.08 - £1,044.08
£1,026.08 - £1,044.08
£1,026.08
£183.99 - £192.99
£183.99 - £192.99
£183.99
Save up to 82% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White Save up to 81% Save %
£923.47 - £941.47
£923.47 - £941.47
£923.47
£165.99 - £174.99
£165.99 - £174.99
£165.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1800mm White (P418K)

Kartell

At 400mm high and 1800mm wide, the Kartell K-RAD Type 21 double panel single convector radiator is an extra-wide heater made for sizeable rooms and...

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£923.47 - £941.47
£923.47 - £941.47
£923.47
£165.99 - £174.99
£165.99 - £174.99
£165.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White Save up to 81% Save %
£820.86 - £838.86
£820.86 - £838.86
£820.86
£146.99 - £155.99
£146.99 - £155.99
£146.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1600mm White (P416K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 1600mm wide is a wide-format heater built for large rooms and lon...

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£820.86 - £838.86
£820.86 - £838.86
£820.86
£146.99 - £155.99
£146.99 - £155.99
£146.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£718.27 - £736.27
£718.27 - £736.27
£718.27
£128.99 - £137.99
£128.99 - £137.99
£128.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1400mm White (P414K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 1400mm wide is a wide-format heater designed for large rooms and ...

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£718.27 - £736.27
£718.27 - £736.27
£718.27
£128.99 - £137.99
£128.99 - £137.99
£128.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£615.65 - £633.65
£615.65 - £633.65
£615.65
£109.99 - £118.99
£109.99 - £118.99
£109.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1200mm White (P412K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 1200mm wide is made for larger rooms and longer walls that need s...

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£615.65 - £633.65
£615.65 - £633.65
£615.65
£109.99 - £118.99
£109.99 - £118.99
£109.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£564.37 - £582.37
£564.37 - £582.37
£564.37
£100.99 - £109.99
£100.99 - £109.99
£100.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1100mm White (P411K)

Kartell

Spanning 1100mm wide at 400mm high, the Kartell K-RAD Type 21 double panel single convector radiator is designed for wider walls and under-window s...

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£564.37 - £582.37
£564.37 - £582.37
£564.37
£100.99 - £109.99
£100.99 - £109.99
£100.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£513.04 - £531.04
£513.04 - £531.04
£513.04
£91.99 - £100.99
£91.99 - £100.99
£91.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 1000mm White (P410K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 1000mm wide is built for rooms that need broad heat coverage from...

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£513.04 - £531.04
£513.04 - £531.04
£513.04
£91.99 - £100.99
£91.99 - £100.99
£91.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£461.75 - £479.75
£461.75 - £479.75
£461.75
£82.99 - £91.99
£82.99 - £91.99
£82.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 900mm White (P409K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 900mm wide is a wider mid-format heater that delivers strong, eve...

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£461.75 - £479.75
£461.75 - £479.75
£461.75
£82.99 - £91.99
£82.99 - £91.99
£82.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£410.44 - £428.44
£410.44 - £428.44
£410.44
£72.99 - £81.99
£72.99 - £81.99
£72.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 800mm White (P408K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 800mm wide is a well-balanced heater that pairs a low-set frame w...

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£410.44 - £428.44
£410.44 - £428.44
£410.44
£72.99 - £81.99
£72.99 - £81.99
£72.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 81% Save %
£359.10 - £377.10
£359.10 - £377.10
£359.10
£63.99 - £72.99
£63.99 - £72.99
£63.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 700mm White (P407K)

Kartell

Measuring 400mm high by 700mm wide, the Kartell K-RAD Type 21 double panel single convector radiator delivers strong heat output from a balanced, m...

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£359.10 - £377.10
£359.10 - £377.10
£359.10
£63.99 - £72.99
£63.99 - £72.99
£63.99
Save up to 81% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 80% Save %
£307.82 - £325.82
£307.82 - £325.82
£307.82
£54.99 - £63.99
£54.99 - £63.99
£54.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 600mm White (P406K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 600mm wide is a compact, balanced heater finished in a clean whit...

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£307.82 - £325.82
£307.82 - £325.82
£307.82
£54.99 - £63.99
£54.99 - £63.99
£54.99
Save up to 80% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 80% Save %
£256.51 - £274.51
£256.51 - £274.51
£256.51
£45.99 - £54.99
£45.99 - £54.99
£45.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 500mm White (P405K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 500mm wide delivers high heat output from a compact, neat profile...

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£256.51 - £274.51
£256.51 - £274.51
£256.51
£45.99 - £54.99
£45.99 - £54.99
£45.99
Save up to 80% Save %
Kartell K-Therm Style Angled Thermostatic Radiator Valve - sold separately
Kartell K-RAD Type 21 Double Panel Single Convector Radiator White
Save up to 80% Save %
£225.70 - £243.70
£225.70 - £243.70
£225.70
£39.99 - £48.99
£39.99 - £48.99
£39.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 400mm x 400mm White (P404K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 400mm high by 400mm wide delivers high heat output from a compact, low-profile ...

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£225.70 - £243.70
£225.70 - £243.70
£225.70
£39.99 - £48.99
£39.99 - £48.99
£39.99
Save up to 80% Save %
Save 75% Save %
£249.20
£249.20 - £249.20
£249.20
£62.30
£62.30 - £62.30
£62.30

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500x600mm (P506K)

Kartell

Introducing the Kartell K-RAD Type 21 Double Panel/Single Convector Radiator (500x600mm)—a compact yet powerful heating solution designed to delive...

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£249.20
£249.20 - £249.20
£249.20
£62.30
£62.30 - £62.30
£62.30
Save 75% Save %

Want more warmth than a slim single-panel radiator, without it projecting too far from the wall? Our Type 21 radiators (double panel, single convector — often labelled P+) are the versatile all-rounder of the convector range, striking the ideal balance between strong heat output and a neat, space-conscious depth.

What is a Type 21 radiator?

A Type 21 radiator has two panels with a single layer of convector fins sandwiched between them. That second panel delivers noticeably more heat than a single-panel Type 11, while keeping the radiator slimmer than a twin-convector Type 22. The result is excellent, responsive warmth from a relatively compact footprint.

Where Type 21 radiators work best

  • Standard and family bathrooms that need dependable, even heat
  • Bedrooms, living spaces and landings of average size
  • Anywhere you want a strong balance of performance and a slim profile — the safe default if you're unsure

Quality you can trust

Our Type 21 collection features the trusted Kartell K-RAD range, engineered for robust, efficient heating with a contemporary finish that complements any bathroom. Choose from a broad selection of widths and heights to match your wall space and heat requirement.

Comparing radiator types

Need a slimmer option for a smaller space? See our Type 11 radiators (single panel, single convector). Heating a larger or harder-to-warm room? A Type 22 radiator (double panel, double convector) offers the highest output. As a quick guide: small room → Type 11, average room → Type 21, large room → Type 22.

New to radiator types? Read our full Type 11 vs Type 21 vs Type 22 radiator guide for help choosing the right one for your space.

Browse our Type 21 radiators below to find the perfect balance of heat and style for your home.