Type 21 Radiators (P+) | Double Panel Single Convector — Page 2

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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

£1,068.62 - £1,086.62

£1,068.62

£140.99 - £149.99

£140.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1400mm White (P614K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 1400mm wide is a wide-format heater built for large rooms and lon...

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£1,068.62 - £1,086.62

£1,068.62

£140.99 - £149.99

£140.99

Save up to 86%

£992.30 - £1,010.30

£992.30

£130.99 - £139.99

£130.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1300mm White (P613K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 1300mm wide is a wide-format heater designed for larger rooms and...

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£992.30 - £1,010.30

£992.30

£130.99 - £139.99

£130.99

Save up to 86%

£915.97 - £933.97

£915.97

£120.99 - £129.99

£120.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1200mm White (P612K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 1200mm wide is made for larger rooms and longer walls that need s...

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£915.97 - £933.97

£915.97

£120.99 - £129.99

£120.99

Save up to 86%

£839.62 - £857.62

£839.62

£110.99 - £119.99

£110.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1100mm White (P611K)

Kartell

Spanning 1100mm wide at 600mm 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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£839.62 - £857.62

£839.62

£110.99 - £119.99

£110.99

Save up to 86%

£763.30 - £781.30

£763.30

£100.99 - £109.99

£100.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1000mm White (P610K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 1000mm wide is built for rooms that need broad, strong heat cover...

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£763.30 - £781.30

£763.30

£100.99 - £109.99

£100.99

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£686.97 - £704.97

£686.97

£89.99 - £98.99

£89.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 900mm White (P609K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 900mm wide offers a broad heating surface from a well-proportione...

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£686.97 - £704.97

£686.97

£89.99 - £98.99

£89.99

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£610.64 - £628.64

£610.64

£79.99 - £88.99

£79.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 800mm White (P608K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 800mm wide is a well-proportioned heater that pairs a useful heig...

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£610.64 - £628.64

£610.64

£79.99 - £88.99

£79.99

Save up to 86%

£534.31 - £552.31

£534.31

£69.99 - £78.99

£69.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 700mm White (P607K)

Kartell

Measuring 600mm high by 700mm wide, the Kartell K-RAD Type 21 double panel single convector radiator offers a strong, balanced heating surface from...

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£534.31 - £552.31

£534.31

£69.99 - £78.99

£69.99

Save up to 86%

£353.75 - £371.75

£353.75

£62.99 - £71.99

£62.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 600mm White (P606K)

Kartell

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

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£353.75 - £371.75

£353.75

£62.99 - £71.99

£62.99

Save up to 81%

£381.64 - £399.64

£381.64

£52.99 - £61.99

£52.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 500mm White (P605K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 600mm high by 500mm wide is a compact, well-proportioned heater finished in a c...

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£381.64 - £399.64

£381.64

£52.99 - £61.99

£52.99

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£305.30 - £323.30

£305.30

£41.99 - £50.99

£41.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 400mm White (P604K)

Kartell

Measuring 600mm high by 400mm wide, the Kartell K-RAD Type 21 double panel single convector radiator is a neat, compact heater finished in a smart ...

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£305.30 - £323.30

£305.30

£41.99 - £50.99

£41.99

Save up to 84%

£1,087.61 - £1,105.61

£1,087.61

£195.99 - £204.99

£195.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 2000mm White (P520K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 2000mm wide is a large, wide-format heater designed for spacious ...

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£1,087.61 - £1,105.61

£1,087.61

£195.99 - £204.99

£195.99

Save up to 81%

£978.85 - £996.85

£978.85

£176.99 - £185.99

£176.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1800mm White (P518K)

Kartell

At 500mm high and 1800mm wide, the Kartell K-RAD Type 21 double panel single convector radiator is an extra-wide, high-output heater made for sizea...

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£978.85 - £996.85

£978.85

£176.99 - £185.99

£176.99

Save up to 81%

£870.11 - £888.11

£870.11

£157.99 - £166.99

£157.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1600mm White (P516K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 1600mm wide is a large, wide-format heater built for spacious roo...

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£870.11 - £888.11

£870.11

£157.99 - £166.99

£157.99

Save up to 81%

£761.35 - £779.35

£761.35

£137.99 - £146.99

£137.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1400mm White (P514K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 1400mm wide is a wide-format heater built for large rooms and lon...

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£761.35 - £779.35

£761.35

£137.99 - £146.99

£137.99

Save up to 81%

£652.60 - £670.60

£652.60

£117.99 - £126.99

£117.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1200mm White (P512K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 1200mm wide is made for larger rooms and longer walls that need s...

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£652.60 - £670.60

£652.60

£117.99 - £126.99

£117.99

Save up to 81%

£598.21 - £616.21

£598.21

£107.99 - £116.99

£107.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1100mm White (P511K)

Kartell

Spanning 1100mm wide at 500mm 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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£598.21 - £616.21

£598.21

£107.99 - £116.99

£107.99

Save up to 81%

£543.84 - £561.84

£543.84

£97.99 - £106.99

£97.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1000mm White (P510K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 1000mm wide is built for rooms that need broad, strong heat cover...

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£543.84 - £561.84

£543.84

£97.99 - £106.99

£97.99

Save up to 81%

£489.44 - £507.44

£489.44

£88.99 - £97.99

£88.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 900mm White (P509K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 900mm wide offers a broad heating surface from a balanced mid-hei...

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£489.44 - £507.44

£489.44

£88.99 - £97.99

£88.99

Save up to 81%

£435.07 - £453.07

£435.07

£78.99 - £87.99

£78.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 800mm White (P508K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 800mm wide is a well-balanced heater that pairs a practical mid-h...

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£435.07 - £453.07

£435.07

£78.99 - £87.99

£78.99

Save up to 81%

£380.69 - £398.69

£380.69

£68.99 - £77.99

£68.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 700mm White (P507K)

Kartell

Measuring 500mm high by 700mm wide, the Kartell K-RAD Type 21 double panel single convector radiator delivers strong heat output from a balanced mi...

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£380.69 - £398.69

£380.69

£68.99 - £77.99

£68.99

Save up to 80%

£326.32 - £344.32

£326.32

£58.99 - £67.99

£58.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 600mm White (P506K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 600mm wide is a well-proportioned heater finished in a smart whit...

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£326.32 - £344.32

£326.32

£58.99 - £67.99

£58.99

Save up to 80%

£271.93 - £289.93

£271.93

£48.99 - £57.99

£48.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 500mm White (P505K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 500mm wide is a compact, high-output heater finished in a clean w...

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£271.93 - £289.93

£271.93

£48.99 - £57.99

£48.99

Save up to 80%

£217.54 - £235.54

£217.54

£38.99 - £47.99

£38.99

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 400mm White (P504K)

Kartell

The Kartell K-RAD Type 21 double panel single convector radiator in 500mm high by 400mm wide is a compact, high-output heater finished in a clean w...

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£217.54 - £235.54

£217.54

£38.99 - £47.99

£38.99

Save up to 80%

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.

Type 21 Radiators (Double Panel/Single Convector)

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Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1400mm White (P614K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1300mm White (P613K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1200mm White (P612K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1100mm White (P611K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 1000mm White (P610K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 900mm White (P609K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 800mm White (P608K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 700mm White (P607K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 600mm White (P606K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 500mm White (P605K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 600mm x 400mm White (P604K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 2000mm White (P520K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1800mm White (P518K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1600mm White (P516K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1400mm White (P514K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1200mm White (P512K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1100mm White (P511K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 1000mm White (P510K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 900mm White (P509K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 800mm White (P508K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 700mm White (P507K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 600mm White (P506K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 500mm White (P505K)

Kartell K-RAD Type 21 Double Panel/Single Convector Radiator 500mm x 400mm White (P504K)

What is a Type 21 radiator?

Where Type 21 radiators work best

Quality you can trust

Comparing radiator types

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