How do I know what heat output (BTU) I need and which panel configuration will give it?

Look at the BTU bands available — you can choose radiators from small outputs (under 1,000 BTU) up to large outputs (10,000–25,000 BTU) listed on the site. Double-panel radiators (Type 21 or 22) give significantly more heat than single panels because they have two parallel panels and convector fins; Type 22 (double panel, double convector) produces more heat than Type 21 (double panel, single convector). If you have a medium to large room choose a double panel double convector in the 3,000–6,000 BTU range or higher depending on room size; for a small bedroom a 1,000–2,000 BTU double panel may be enough. If you tell me your room dimensions and window area I can suggest a target BTU and a suitable Type 21 or 22 size.

I have limited wall width but plenty of height — should I pick a vertical radiator or a slim horizontal one?

Vertical double radiators are ideal when you have little horizontal wall space; the category contains many vertical options with heights up to 2200mm, and common tall sizes around 1600–1800mm. Slim, wide models work well if you can fit under a windowsill — the site shows low heights such as 300–400mm paired with long widths like 1000–1400mm. For example, if your wall is narrow but tall, a 1800mm vertical double radiator gives high output without taking horizontal space; if you have a long window sill, a 300mm high by 1200mm wide slim double radiator sits neatly underneath.

Which material should I choose — aluminium, steel or mild steel — and how does it affect heating and look?

Aluminium heats up quickly and is lightweight, so it responds fast if you want rapid warming, while steel and mild steel (the most common options on the site) retain heat well and are very durable for everyday use. The site lists aluminium, mild steel and steel by the dozens, so you'll find many finishes in each material. If you need a fast-responding radiator for a bathroom choose aluminium; for a living room where steady, lasting warmth matters, a mild steel double panel is a good, long-lasting choice.

I like a traditional look — are double column radiators still practical compared with flat designer panels?

Yes, double column radiators combine strong heat output with a traditional appearance; the site shows many column-profile options alongside flat and oval profiles. Column radiators have deeper projection and trap more air between columns, which increases heat output, whereas flat designer panels are slimmer and give a cleaner, modern look. For example, a Park Lane Colosseum double column at 300 x 425mm looks period-correct in a Victorian room and still delivers solid heat, while a flat double-panel radiator is preferable if you want a minimalist kitchen run.

I need a radiator to go beneath a low windowsill — which heights and types will fit without losing heat efficiency?

Choose radiators listed at low heights — there are many at 300–400mm — and opt for a wide double panel to maximise heat across the small height. Slim, wide double panels sit neatly under sills and still offer substantial output because of their two panels and convector fins; triple panels give even more heat but project further from the wall. For instance, a 300mm high by 1200mm wide Type 22 (double panel, double convector) will fit under a low sill and produce far more warmth than a single-panel slim model.

Page 6 of 23 Double Radiators

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Stelrad Compact K2 Type 22 450 x 900mm Double Panel Radiator Double Convector - 143721

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£131.41 inc
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k-rad-kompact-type-21-double-panel-radiator-600-x-1100mm

K Rad Kompact Type 21 600 x 1100mm Radiator - Double Panel Single Convector

5.0

13 ratings

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£132.06 inc
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K Rad Kompact Type 21 750 x 1000mm Radiator - Double Panel Single Convector

5.0

13 ratings

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£134.71 inc
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solaro-k2-type-22-600-x-400mm-double-panel-radiator-double-convector-anthracite

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£137.00 inc
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K Rad Kompact Type 22 900 x 500mm Radiator - Double Panel Double Convector

4.9

33 ratings

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£137.14 inc
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k-rad-kompact-type-22-double-panel-plus-radiator-600-x-1200mm

K Rad Kompact Type 22 600 x 1200mm Radiator - Double Panel Double Convector

4.9

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£137.78 inc
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Save £17.01 | Was £154.79

stelrad-compact-p-radiator-300mm-x-1500mm-double-panel-single-convector-143658

Stelrad Compact P+ Type 21 300 x 1500mm Double Panel Radiator Single Convector - 143658

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£138.91 inc
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Save £33.08 | Was £171.99

k-rad-kompact-type-22-double-panel-plus-radiator-500-x-900mm

K Rad Kompact Type 22 500 x 900mm Radiator - Double Panel Double Convector

4.9

33 ratings

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£138.98 inc
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K Rad Kompact Type 21 400 x 1400mm Radiator - Double Panel Single Convector

5.0

13 ratings

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£139.73 inc
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DuraTherm Vertical Double Flat Panel Designer Radiator - 1800 x 300mm Anthracite

5.0

860 ratings

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£139.95 inc
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DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 305mm Black

5.0

860 ratings

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£139.95 inc
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DuraTherm Horizontal Double Flat Panel Designer Radiator - 600 x 760mm Black

5.0

708 ratings

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Park Lane Traditional Colosseum Double Bar Column Radiator White 600 x 1010mm

4.9

126 ratings

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£139.95 inc
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Save £20.04 | Was £159.99

k-rad-kompact-type-21-double-panel-radiator-900-x-600mm

K Rad Kompact Type 21 900 x 600mm Radiator - Double Panel Single Convector

5.0

13 ratings

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£139.96 inc
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5.0

32 ratings

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£139.99 inc
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4.9

126 ratings

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£140.00 inc
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K Rad Kompact Type 21 500 x 1400mm Radiator - Double Panel Single Convector

5.0

13 ratings

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£140.71 inc
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stelrad-elite-k2-radiator-450mm-x-1000mm-double-panel-double-convector-8503

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k-rad-kompact-double-panel-twin-convector-radiator-400-x-1600mm-type-22

K Rad Kompact Type 22 400 x 1600mm Radiator - Double Panel Double Convector

4.9

33 ratings

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£145.64 inc
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stelrad-compact-with-style-k2-radiator-500mm-x-400mm-double-panel-double-convector-7452204

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k-rad-kompact-type-22-double-panel-plus-radiator-900-x-600mm

K Rad Kompact Type 22 900 x 600mm Radiator - Double Panel Double Convector

4.9

33 ratings

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£148.80 inc
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Page 6 of 23 Double Radiators

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Stelrad Compact K2 Type 22 450 x 900mm Double Panel Radiator Double Convector - 143721

K Rad Kompact Type 21 600 x 1100mm Radiator - Double Panel Single Convector

K Rad Kompact Type 21 750 x 1000mm Radiator - Double Panel Single Convector

Solaro K2 Type 22 600 x 400mm Double Panel Radiator, Double Convector - Anthracite

Solaro K2 Type 22 600 x 400mm Double Panel Radiator, Double Convector - Black

K Rad Kompact Type 22 750 x 900mm Radiator - Double Panel Double Convector

K Rad Kompact Type 22 900 x 500mm Radiator - Double Panel Double Convector

K Rad Kompact Type 22 600 x 1200mm Radiator - Double Panel Double Convector

Stelrad Compact P+ Type 21 300 x 1500mm Double Panel Radiator Single Convector - 143658

K Rad Kompact Type 22 500 x 900mm Radiator - Double Panel Double Convector

K Rad Kompact Type 21 400 x 1400mm Radiator - Double Panel Single Convector

DuraTherm Vertical Double Flat Panel Designer Radiator - 1800 x 300mm Anthracite

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 305mm Black

DuraTherm Horizontal Double Flat Panel Designer Radiator - 600 x 760mm Black

Park Lane Traditional Colosseum Double Bar Column Radiator White 600 x 1010mm

K Rad Kompact Type 21 900 x 600mm Radiator - Double Panel Single Convector

DuraTherm Horizontal Oval Tube Double Panel Designer Radiator - 600 x 780mm White

Park Lane Traditional Colosseum Double Bar Column Radiator Anthracite 600 x 830mm

K Rad Kompact Type 21 500 x 1400mm Radiator - Double Panel Single Convector

Stelrad Elite K2 Type 22 450 x 1000mm Double Panel Radiator Double Convector - 8503

Stelrad Compact P+ Type 21 450 x 1100mm Double Panel Radiator Single Convector - 143705

Stelrad Compact P+ Type 21 600 x 900mm Double Panel Radiator Single Convector - 143769

Stelrad Compact K2 Type 22 450 x 1000mm Double Panel Radiator Double Convector - 143722

Stelrad Elite P+ Type 21 450 x 1200mm Double Panel Radiator Single Convector - 8487

Stelrad Compact P+ Type 21 700 x 800mm Double Panel Radiator Single Convector - 143834

Solaro P+ Type 21 600 x 600mm Double Panel Radiator, Single Convector - Anthracite

Solaro P+ Type 21 600 x 600mm Double Panel Radiator, Single Convector - Black

K Rad Kompact Type 22 600 x 1300mm Radiator - Double Panel Double Convector

K Rad Kompact Type 22 400 x 1600mm Radiator - Double Panel Double Convector

Stelrad Compact with Style K2 Type 22 500 x 400mm Double Panel Radiator Double Convector - 7452204

Stelrad Compact K2 Type 22 600 x 800mm Double Panel Radiator Double Convector - 143786

K Rad Kompact Type 21 600 x 1300mm Radiator - Double Panel Single Convector

K Rad Kompact Type 22 900 x 600mm Radiator - Double Panel Double Convector

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