How do single, double and triple panel radiators differ, and which is best for your room?

Single, double and triple panel radiators refer to the number of steel panels and convector fins they contain: Type 11 is a single panel, Type 21 and 22 are double panel options, and there are triple-panel types too. More panels and convectors produce higher heat output for the same footprint, so a Type 22 (double panel double convector) suits an open-plan living room, while a slim Type 11 single panel is fine for a small bedroom or hallway. Triple-panel units give maximum output but hold more water and are deeper, so they work well where wall space is limited but heat demand is high. If you want a balance of warmth and a low visual profile, most people opt for a Type 21 or 22 in the common 600 mm height.

How do you choose the right radiator size and BTU for your room?

Use the BTU output bands shown, 1,000–1,999 BTU suits small bedrooms, 2,000–3,999 BTU covers average rooms, 4,000–7,999 BTU is for larger living spaces, and 8,000+ BTU for big open-plan areas. Match a radiator's BTU rating to your room's calculated heat loss; many horizontal panels come in popular heights (300–900 mm, with 600 mm most common) and widths from about 400 mm up to 2,000 mm, so you can increase heat by choosing a wider model if wall height is fixed. As a practical example, if you need around 3,000 BTU you might select a 600 x 1200 mm Type 22 double convector from the Compact or Kompact ranges.

What’s the difference between Compact, Planar, Kompact and LST ranges and when should you pick each?

Compact and Kompact ranges are practical, high-output options with convector fins for rapid heat, making them ideal for living rooms and kitchens; Planar models have a sleeker, flatter front for a more contemporary look. LST (low surface temperature) radiators are designed to run cooler on the casing and are suitable where safety matters, such as care homes or rooms used by children and the elderly. Choose Planar if you want minimal, modern styling; pick LST when surface temperature or regulations are a concern; opt for Compact/Kompact when performance is your priority.

Can you get horizontal panel radiators in different colours and will that affect performance?

Yes, many models are offered in standard white and in darker finishes such as black or anthracite, as shown in the Solaro and Planar products in our range. Colour and finish are primarily an aesthetic choice and have negligible effect on a radiator's heat output, so pick a finish that complements your décor, anthracite for a modern kitchen or matte black for a striking living-room statement. If you want understated heating that blends in, choose a white Compact or Planar model in the common 600 mm height.

Are horizontal panel radiators energy efficient and how can you make them work efficiently in your home?

Many models in the range are built for efficiency, convector fins and multiple panels increase heat transfer so rooms warm up faster, which can reduce running time. To be efficient, match the radiator's BTU to the room and pick a design with suitable convector count; a double panel double convector warms a living area quickly, while a single panel suffices for a small bedroom. Also select a modern range like Compact or Kompact that's engineered for rapid heat distribution to get good performance from your system.

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Stelrad Softline Compact P+ 450 x 1400mm Double Panel Radiator Single Convector White - 80452114

Stelrad Softline Compact P+ 450 x 1600mm Double Panel Radiator Single Convector White - 80452116

Stelrad Softline Compact P+ 600 x 1000mm Double Panel Radiator Single Convector White - 80602110

Stelrad Softline Compact P+ 600 x 1100mm Double Panel Radiator Single Convector White - 80602111

Stelrad Softline Compact P+ 600 x 1200mm Double Panel Radiator Single Convector White - 80602112

Stelrad Softline Compact P+ 600 x 1400mm Double Panel Radiator Single Convector White - 80602114

Stelrad Softline Compact P+ 600 x 1600mm Double Panel Radiator Single Convector White - 80602116

Stelrad Softline Compact P+ 600 x 400mm Double Panel Radiator Single Convector White - 80602104

Stelrad Softline Compact P+ 600 x 500mm Double Panel Radiator Single Convector White - 80602105

Stelrad Softline Compact P+ 600 x 600mm Double Panel Radiator Single Convector White - 80602106

Stelrad Softline Compact P+ 600 x 700mm Double Panel Radiator Single Convector White - 80602107

Stelrad Softline Compact P+ 600 x 800mm Double Panel Radiator Single Convector White - 80602108

Stelrad Softline Compact P+ 600 x 900mm Double Panel Radiator Single Convector White - 80602109

Stelrad Softline Compact K2 300 x 1000mm Double Panel Radiator Double Convector White - 80302210

Stelrad Softline Compact K2 300 x 1500mm Double Panel Radiator Double Convector White - 80302215

Stelrad Softline Compact K2 300 x 2000mm Double Panel Radiator Double Convector White - 80302220

Stelrad Softline Compact K2 300 x 500mm Double Panel Radiator Double Convector White - 80302205

Stelrad Softline Compact K2 450 x 1000mm Double Panel Radiator Double Convector White - 80452210

Stelrad Softline Compact K2 450 x 1100mm Double Panel Radiator Double Convector White - 80452211

Stelrad Softline Compact K2 450 x 1200mm Double Panel Radiator Double Convector White - 80452212

Stelrad Softline Compact K2 450 x 1400mm Double Panel Radiator Double Convector White - 80452214

Stelrad Softline Compact K2 450 x 1600mm Double Panel Radiator Double Convector White - 80452216

Stelrad Softline Compact K2 450 x 1800mm Double Panel Radiator Double Convector White - 80452218

Stelrad Softline Compact K2 450 x 400mm Double Panel Radiator Double Convector White - 80452204

Stelrad Softline Compact K2 450 x 500mm Double Panel Radiator Double Convector White - 80452205

Stelrad Softline Compact K2 450 x 600mm Double Panel Radiator Double Convector White - 80452206

Stelrad Softline Compact K2 450 x 700mm Double Panel Radiator Double Convector White - 80452207

Stelrad Softline Compact K2 450 x 800mm Double Panel Radiator Double Convector White - 80452208

Stelrad Softline Compact K2 450 x 900mm Double Panel Radiator Double Convector White - 80452209

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

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