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 18 of 19 Double Panel & Column Radiators – Modern Heating

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Eastlake Rivassa 1800 x 383mm Traditional 2 Column Vertical Radiator - Bronze Effect

Eastlake Rivassa 600 x 1148mm Traditional 2 Column Radiator - Bronze Effect

Eastlake Rivassa 600 x 1010mm Traditional 2 Column Radiator - Bronze Effect

Eastlake Rivassa 600 x 833mm Traditional 2 Column Radiator - Bronze Effect

Eastlake Rivassa 600 x 608mm Traditional 2 Column Radiator - Bronze Effect

Eastlake Imperia 1800 x 470mm Traditional 2 Column Vertical Radiator - Bare Metal

Eastlake Imperia 1800 x 380mm Traditional 2 Column Vertical Radiator - Bare Metal

Eastlake Imperia 600 x 1145mm Traditional 2 Column Radiator - Bare Metal

Eastlake Imperia 600 x 830mm Traditional 2 Column Radiator - Bare Metal

Eastlake Imperia 600 x 605mm Traditional 2 Column Radiator - Bare Metal

Solaro Murano 600 x 1400mm Designer Radiator - Matt Black

Solaro Murano 600 x 1200mm Designer Radiator - Matt Black

Solaro Murano 600 x 1000mm Designer Radiator - Matt Black

Stelrad Compact K2 Type 22 600 x 1400mm Double Panel Radiator Double Convector - 143791

Solaro Guardia 1200 x 565mm Vertical Designer Aluminium Radiator Matt Anthracite

Solaro Guardia 600 x 850mm Horizontal Designer Aluminium Radiator Matt White

Stelrad Softline Compact K2 1800 x 400mm Double Panel Radiator White - 87122418

Solaro Guardia 1200 x 280mm Vertical Designer Aluminium Radiator Matt White

Stelrad Elite K2 Type 22 600 x 900mm Double Panel Radiator Double Convector - 8569

Stelrad Compact K2 Type 22 450 x 1100mm Double Panel Radiator Double Convector - 143723

Stelrad LST Standard P+ Type 21 650 x 1360mm Double Panel Radiator Single Convector - 145036

Stelrad Elite K2 Type 22 700 x 400mm Double Panel Radiator Double Convector - 8631

Stelrad Elite P+ Type 21 600 x 500mm Double Panel Radiator Single Convector - 8547

Stelrad Elite K2 Type 22 600 x 600mm Double Panel Radiator Double Convector - 8566

Stelrad Elite K2 Type 22 600 x 400mm Double Panel Radiator Double Convector - 8564

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

Stelrad Elite K2 Type 22 450 x 800mm Double Panel Radiator Double Convector - 8501

Stelrad Elite K2 Type 22 450 x 700mm Double Panel Radiator Double Convector - 8500

Stelrad Elite K2 Type 22 450 x 500mm Double Panel Radiator Double Convector - 8498

Stelrad Elite K2 Type 22 300 x 1500mm Double Panel Radiator Double Convector - 8444

Stelrad Elite K2 Type 22 300 x 1000mm Double Panel Radiator Double Convector - 8443

Stelrad Compact with Style K2 Type 22 600 x 400mm Double Panel Radiator Double Convector - 7462204

Stelrad Compact K2 Type 22 700 x 1200mm Double Panel Radiator Double Convector - 143856

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