How do I work out the right size and heat output for my room?

First, match the radiator’s BTU (Delta 50) band to the heat requirement of the room — the site groups radiators into ranges such as 1–999, 1000–1999, 2000–2999 and up to 10,000–25,000 BTU so you can pick a product that meets your target. As a quick guide, a small bedroom often sits in the 1000–1999 BTU band, while a medium living room commonly needs 3000–4999 BTU; larger open-plan spaces may need 5000–7000 BTU or more. Then choose a physical size that fits your wall: common heights include 600mm (many options) and tall verticals at 1600–1800mm if you have limited wall width. For example, if your living room needs about 3500 BTU you might choose a horizontal double panel radiator in the 600 x 1215mm or 600 x 1440mm sizes shown on the site.

Which radiator material is best for speed of heat and long-term performance?

Aluminium radiators (around 345 options on the site) heat up quickly and are lightweight, so they’re ideal if you want fast warmth and lower mass. Steel and mild steel radiators (several hundred listings) are heavier, retain heat longer and give a steadier, more even output once warm, so they suit living areas where sustained heat is useful. Each material has trade-offs: aluminium is faster but can cool quicker, while steel stores heat but responds more slowly. If you want fast-response heating in a small bathroom, aluminium suits well; for a family lounge where retained heat matters, a mild-steel panel radiator is often better.

Should I choose a vertical or horizontal radiator for a small bathroom or hallway?

Vertical radiators (about 501 products) are perfect where wall width is limited — tall models such as 1600–1800mm let you fit a high-output unit in a narrow space and free up low wall area for furniture. Horizontal radiators (around 609 products) work best under windows or across longer walls and are often available in wider options like 910–1440mm to deliver higher outputs at 600mm height. For a narrow hallway, a vertical double-flat-panel at 1800 x 455mm gives strong heat without crowding the floor; for a bathroom under a window, a horizontal 600 x 1215mm double panel provides good output and sits neatly beneath the sill.

What’s the practical difference between traditional column radiators and modern flat panel designer types?

Traditional column radiators (for example the Park Lane Colosseum range) use multiple bars or columns to give high surface area and a classic look; double or triple bar columns also make handy towel spaces in a bathroom. Modern flat-panel designer radiators (like DuraTherm double panels) have a slim, minimalist face and often deliver equivalent output in a shallower profile, so they suit contemporary interiors and tighter clearances. Choose a column if you want period styling and a tactile feel; pick a flat panel if you prefer a sleek, low-profile radiator that tucks close to the wall.

Do different colours or finishes affect performance or are they just aesthetic choices?

Colour and finish are mostly aesthetic — the catalogue shows many options such as white (551 items), anthracite (239), black (185), chrome and brass — but finish can influence maintenance and where you’ll use the radiator. For example, chrome or brass-toned radiators work well in bathrooms because they complement taps and fittings, while white is the most common, usually cost-effective choice for living spaces. Very dark finishes like anthracite will show dust and fingerprints more readily, so you might prefer white or chrome in a busy family area.

Page 32 of 35 Central Heating Radiators

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Stelrad Softline Compact K2 600 x 1000mm Double Panel Radiator Double Convector White - 80602210

Stelrad Softline Compact K2 600 x 1100mm Double Panel Radiator Double Convector White - 80602211

Stelrad Softline Compact K2 600 x 1200mm Double Panel Radiator Double Convector White - 80602212

Stelrad Softline Compact K2 600 x 1400mm Double Panel Radiator Double Convector White - 80602214

Stelrad Softline Compact K2 600 x 1600mm Double Panel Radiator Double Convector White - 80602216

Stelrad Softline Compact K2 600 x 1800mm Double Panel Radiator Double Convector White - 80602218

Stelrad Softline Compact K2 600 x 2000mm Double Panel Radiator Double Convector White - 80602220

Stelrad Softline Compact K2 600 x 400mm Double Panel Radiator Double Convector White - 80602204

Stelrad Softline Compact K2 600 x 500mm Double Panel Radiator Double Convector White - 80602205

Stelrad Softline Compact K2 600 x 600mm Double Panel Radiator Double Convector White - 80602206

Stelrad Softline Compact K2 600 x 700mm Double Panel Radiator Double Convector White - 80602207

Stelrad Softline Compact K2 600 x 800mm Double Panel Radiator Double Convector White - 80602208

Stelrad Softline Compact K2 600 x 900mm Double Panel Radiator Double Convector White - 80602209

Stelrad Softline Compact K2 700 x 1000mm Double Panel Radiator Double Convector White - 80702210

Stelrad Softline Compact K2 700 x 1100mm Double Panel Radiator Double Convector White - 80702211

Stelrad Softline Compact K2 700 x 1200mm Double Panel Radiator Double Convector White - 80702212

Stelrad Softline Compact K2 700 x 1400mm Double Panel Radiator Double Convector White - 80702214

Stelrad Softline Compact K2 700 x 1600mm Double Panel Radiator Double Convector White - 80702216

Stelrad Softline Compact K2 700 x 1800mm Double Panel Radiator Double Convector White - 80702218

Stelrad Softline Compact K2 700 x 2000mm Double Panel Radiator Double Convector White - 80702220

Stelrad Softline Compact K2 700 x 400mm Double Panel Radiator Double Convector White - 80702204

Stelrad Softline Compact K2 700 x 500mm Double Panel Radiator Double Convector White - 80702205

Stelrad Softline Compact K2 700 x 600mm Double Panel Radiator Double Convector White - 80702206

Stelrad Softline Compact K2 700 x 700mm Double Panel Radiator Double Convector White - 80702207

Stelrad Softline Compact K2 700 x 800mm Double Panel Radiator Double Convector White - 80702208

Stelrad Softline Compact K2 700 x 900mm Double Panel Radiator Double Convector White - 80702209

Park Lane Traditional Colosseum Triple Bar Column Radiator Black 300 x 425mm

Solaro Single Panel 600 x 366mm Vertical Designer Aluminium Radiator Gloss White

Solaro Single Panel 600 x 810mm Designer Aluminium Radiator Gloss White

Solaro Single Panel 1400 x 514mm Vertical Designer Aluminium Radiator Gloss White

Solaro Single Panel 1800 x 292mm Vertical Designer Aluminium Radiator Gloss White

Solaro Double Panel 600 x 440mm Vertical Designer Aluminium Radiator Gloss White

Solaro Double Panel 600 x 810mm Designer Aluminium Radiator Gloss White

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