EXTRA 10% OFF BATHS WITH CODE: BATH10

*Free delivery on orders over £499

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.

Filter By

£
to
Filter By

Sort By

57 results

View:

57 results

View:

Type 21 H600 x W900mm Double Panel Single Convector Radiator - P609K Large Image

£124.94

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 H500 x W1400mm Double Panel Single Convector Radiator - P514K Large Image

£154.94

The stock status is In Stock

In Stock

1

5 out of 5 review stars
Type 21 H400 x W400mm Double Panel Single Convector Radiator - P404K Large Image

£84.94

The stock status is In Stock

In Stock

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

£134.94

The stock status is In Stock

In Stock

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

£99.94

The stock status is In Stock

In Stock

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

£209.94

The stock status is In Stock

In Stock

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

£99.94

The stock status is In Stock

In Stock

1

4 out of 5 review stars
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 W600mm Double Panel Single Convector Radiator - P406K Large Image

£84.94

The stock status is In Stock

In Stock

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 W800mm Double Panel Single Convector Radiator - P708K Large Image

£124.94

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 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 W1100mm Double Panel Single Convector Radiator - P511K 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 W700mm Double Panel Single Convector Radiator - P507K Large Image

£99.94

The stock status is In Stock

In Stock

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

£144.94

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 H500 x W1200mm Double Panel Single Convector Radiator - P512K Large Image

£144.94

The stock status is Due 22nd Oct

Due 22nd Oct

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

£124.94

The stock status is Available

Available

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

£89.94

The stock status is Available

Available

1

4 out of 5 review stars

You've viewed 57 of 57 results

Progress

Recently Reviewed

Type 21 H500 x W1800mm Double Panel Single Convector Radiator - P518K Large Image

Review From Trustpilot

11th October 2025

Good heat output.

Graham Rice- verified purchaser

Type 21 H400 x W1800mm Double Panel Single Convector Radiator - P418K Large Image

1.8 metre radiator.

4th October 2025

The radiator was good quality, the price was competitive and delivered with sufficient packaging so as not to get damaged. Good comms for delivery

Mr S A Kirk from - verified purchaser

Type 21 H600 x W1200mm Double Panel Single Convector Radiator - P612K Large Image

Review From Trustpilot

25th September 2025

A very neat radiator, easy to install with the included mounting brackets

Royston- verified purchaser

Type 21 H500 x W2200mm Double Panel Single Convector Radiator - P522K Large Image

Radiator

7th September 2025

Took the old one out when I got a fire but decided to put one back in for the not so cold evenings. It came well packed with no chips or dents and was super easy to install , love this radiator

Chris King from - verified purchaser