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 5 of 35 Central Heating Radiators

Terma Hex Matt Black Designer Radiator 1220 X 486mm

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£570.98 inc
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Terma Hex Bright Copper Designer Radiator 1220 X 486mm

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£570.37 inc
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Save £71.76 | Was £642.13

DuraTherm Horizontal Oval Tube Double Panel Designer Radiator - 600 x 1560mm White

5.0

32 ratings

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£299.00 inc
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terma-hex-mustard-designer-radiator-1220-x-486mm

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£159.95 inc
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duratherm-vertical-double-flat-panel-designer-radiator-1600-x-610mm-black

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 605mm Black

5.0

860 ratings

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£279.99 inc
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terma-hex-sparkling-grey-designer-radiator-502-x-1126mm

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£289.99 inc
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terma-rolo-salt-n-pepper-designer-radiator-with-mirror-1800-x-590mm

Terma Rolo Salt n Pepper Grey Designer Radiator with Mirror 1800 x 590mm

£366.08 inc
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duratherm-vertical-double-flat-panel-designer-radiator-1600-x-610mm-white

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 605mm White

5.0

860 ratings

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£299.00 inc
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DuraTherm Vertical Single Flat Panel Designer Radiator - 1600 x 605mm Black

5.0

860 ratings

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£139.95 inc
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DuraTherm Vertical Single Flat Panel Designer Radiator - 1600 x 605mm White

5.0

860 ratings

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£149.99 inc
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Terma Ribbon V Bright Copper Designer Radiator 1720 X 390mm

£824.99 inc
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DuraTherm Horizontal Single Flat Panel Designer Radiator - 600 x 1060mm Black

5.0

708 ratings

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£119.99 inc
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terma-rolo-room-quartz-mocha-designer-radiator-1200-x-590-mm

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£129.95 inc
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terma-rolo-room-heban-black-designer-radiator-1200-x-590-mm

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£99.95 inc
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Save £30.00 | Was £129.95

Page 5 of 35 Central Heating Radiators

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Terma Hex Matt Black Designer Radiator 1220 X 486mm

Terma Hex Bright Copper Designer Radiator 1220 X 486mm

DuraTherm Horizontal Oval Tube Double Panel Designer Radiator - 600 x 1560mm White

Terma Hex Mustard Designer Radiator 1220 X 486mm

Terma Hex Matt Black Designer Radiator 1700 X 573mm

Terma Hex Bright Copper Designer Radiator 1700 X 573mm

Terma Hex Sparkling Grey Designer Radiator 1700 X 573mm

DuraTherm Horizontal Oval Tube Single Panel Designer Radiator - 600 x 1440mm White

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 605mm Black

Terma Hex Sparkling Grey Designer Radiator 502 x 1126mm

Terma Rolo Modern Grey Designer Radiator with Mirror 1800 x 590mm

Terma Rolo White Designer Radiator with Mirror 1800 x 590mm

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 605mm Anthracite

Terma Rolo Salt n Pepper Grey Designer Radiator with Mirror 1800 x 590mm

DuraTherm Vertical Double Flat Panel Designer Radiator - 1600 x 605mm White

DuraTherm Vertical Single Flat Panel Designer Radiator - 1600 x 605mm Black

DuraTherm Vertical Single Flat Panel Designer Radiator - 1600 x 605mm White

Terma Ribbon V Bright Copper Designer Radiator 1720 X 390mm

DuraTherm Horizontal Single Flat Panel Designer Radiator - 600 x 1060mm Black

Terma Rolo Room Quartz Mocha Designer Radiator 1200 x 590 mm

Terma Rolo Room Modern Grey Designer Radiator 1200 x 590 mm

Terma Rolo Room Brass Designer Radiator 1200 x 590 mm

DuraTherm Horizontal Single Flat Panel Designer Radiator - 600 x 1060mm Anthracite

Terma Rolo Room Heban Black Designer Radiator 1200 x 590 mm

Terma Rolo Room White Designer Radiator 1800 x 370 mm

Terma Rolo Room Quartz Mocha Designer Radiator 1800 x 370 mm

Terma Rolo Room Brass Designer Radiator 1800 x 370 mm

Terma Rolo Room True Copper Designer Radiator 1800 x 370 mm

DuraTherm Horizontal Single Flat Panel Designer Radiator - 600 x 1060mm White

Terma Rolo Room White Designer Radiator 1800 x 480 mm

Stelrad Elite K2 Type 22 700 x 1100mm Double Panel Radiator Double Convector - 8638

Terma Rolo Room Modern Grey Designer Radiator 1800 x 480 mm

Terma Rolo Room Brass Designer Radiator 1800 x 480 mm

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