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Type 21 Radiators

Shop our type 21 radiators. These efficient and understated double panel single convector radiators offer a simple heating solution for almost any room in your home. Like the look of a slimline double radiator but need something a little more compact? Try our range of single panel radiators. Free standard UK delivery on orders over £499.

Sometimes known as double panel plus radiators, type 21 radiators are classed as single convector radiators due to the fact that they are composed of a single row of fins between two panels. This makes them a relatively compact and small double radiator option when compared to double panel radiators (known as type 22).

Each and every one of our type 21 radiators has been handpicked for its quality. Made by using modern manufacturing techniques and fine materials - such as stainless steel - you can rest assured your new radiator will provide years of faultless use. The overwhelming majority of double panel single convector radiators even come with lengthy guarantees against defects. Browse our full range of convector radiators.

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Type 21 H500 x W1600mm Double Panel Single Convector Radiator - P516K Large Image

£174.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H500 x W800mm Double Panel Single Convector Radiator - P508K Large Image

£114.94

The stock status is In Stock

In Stock

Type 21 H400 x W1200mm Double Panel Single Convector Radiator - P412K Large Image

£124.94

The stock status is In Stock

In Stock

Type 21 H400 x W900mm Double Panel Single Convector Radiator - P409K Large Image

£114.94

The stock status is In Stock

In Stock

Type 21 H400 x W800mm Double Panel Single Convector Radiator - P408K Large Image

£99.94

The stock status is In Stock

In Stock

Type 21 H900 x W600mm Double Panel Single Convector Radiator - P906K Large Image

£149.94

The stock status is In Stock

In Stock

Type 21 H750 x W700mm Double Panel Single Convector Radiator - P707K Large Image

£114.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H400 x W500mm Double Panel Single Convector Radiator - P405K Large Image

£84.94

The stock status is In Stock

In Stock

Type 21 H750 x W800mm Double Panel Single Convector Radiator - P708K Large Image

£124.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H600 x W1800mm Double Panel Single Convector Radiator - P618K Large Image

£229.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H600 x W500mm Double Panel Single Convector Radiator - P605K Large Image

£99.94

The stock status is In Stock

In Stock

Type 21 H500 x W1000mm Double Panel Single Convector Radiator - P510K Large Image

£124.94

The stock status is In Stock

In Stock

Type 21 H500 x W900mm Double Panel Single Convector Radiator - P509K Large Image

£114.94

The stock status is In Stock

In Stock

Type 21 H500 x W600mm Double Panel Single Convector Radiator - P506K Large Image

£99.94

The stock status is In Stock

In Stock

2

4.5 out of 5 review stars
Type 21 H400 x W600mm Double Panel Single Convector Radiator - P406K Large Image

£84.94

The stock status is In Stock

In Stock

Type 21 H900 x W400mm Double Panel Single Convector Radiator - P904K Large Image

£124.94

The stock status is In Stock

In Stock

1

4 out of 5 review stars
Type 21 H500 x W400mm Double Panel Single Convector Radiator - P504K Large Image

£84.94

The stock status is In Stock

In Stock

Type 21 H750 x W1000mm Double Panel Single Convector Radiator - P710K Large Image

£144.94

The stock status is In Stock

In Stock

Type 21 H500 x W1100mm Double Panel Single Convector Radiator - P511K Large Image

£124.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H900 x W700mm Double Panel Single Convector Radiator - P907K Large Image

£174.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H400 x W1100mm Double Panel Single Convector Radiator - P411K Large Image

£124.94

The stock status is In Stock

In Stock

Type 21 H400 x W1000mm Double Panel Single Convector Radiator - P410K Large Image

£114.94

The stock status is In Stock

In Stock

Type 21 H900 x W900mm Double Panel Single Convector Radiator - P909K Large Image

£229.94

The stock status is In Stock

In Stock

Type 21 H900 x W800mm Double Panel Single Convector Radiator - P908K Large Image

£209.94

The stock status is In Stock

In Stock

Type 21 H400 x W700mm Double Panel Single Convector Radiator - P407K Large Image

£99.94

The stock status is In Stock

In Stock

Type 21 H500 x W2000mm Double Panel Single Convector Radiator - P520K Large Image

£234.95

The stock status is Available

Available

Type 21 H500 x W700mm Double Panel Single Convector Radiator - P507K Large Image

£99.94

The stock status is Available

Available

You've viewed 57 of 57 results

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Recently Reviewed

Type 21 H500 x W500mm Double Panel Single Convector Radiator - P505K Large Image

Real quality, and great value for money.

12th February 2026

Well packaged. Reliable Company.

SHERIDAN P from Norfolk- verified purchaser

Type 21 H600 x W400mm Double Panel Single Convector Radiator - P604K Large Image

Radiator

5th February 2026

Good looking and good value recommend

Richard P from Hampshire- verified purchaser

Type 21 H500 x W600mm Double Panel Single Convector Radiator - P506K Large Image

good value

4th February 2026

good value simple radiator

vanessa S from North Yorkshire- verified purchaser

Type 21 H750 x W900mm Double Panel Single Convector Radiator - P709K Large Image

Great value

22nd December 2025

Great value radiator that was easy to install.

Tim M from - verified purchaser