Double Radiators

Frequently Asked Questions About Double Radiators

How much more heat does a double radiator produce compared to a single?

A double radiator produces approximately 60 to 80 percent more heat than a single panel radiator of the same dimensions, because its two panels and increased water capacity generate a significantly larger heat output. This makes double radiators the right choice for larger rooms, open-plan spaces, and any room that consistently struggles to reach a comfortable temperature.

Should I choose a horizontal or vertical double radiator?

A horizontal double radiator works best in rooms with wider walls and is ideal positioned beneath a window to counteract cold draughts, while a vertical double radiator is the better option where wall width is limited, as it maximises output from a narrow footprint. Popular horizontal sizes include 1200x600, 1000x600, and 800x600, while vertical models are commonly available in 1800x600, 1600x600, and 1400x600.

Can I replace a single radiator with a double radiator?

Yes, in most cases a single radiator can be swapped out for a double radiator using the existing pipework connections, as both use standard plumbing fittings that integrate into your existing heating circuit. It is worth confirming the new radiator dimensions fit the available wall space before purchasing, as double panels are deeper than single panel equivalents.

How do I know what size double radiator I need?

The correct size is determined by the BTU (British Thermal Unit) requirement of your room, calculated using its dimensions, ceiling height, glazing, insulation, and orientation. Use our BTU calculator to find your exact output requirement and always check the radiator's rated figure at Delta T50 (ΔT50) under BS EN 442 before purchasing.

Are double radiators available in steel or aluminium?

Our range includes both materials. Steel double radiators come with a 20-year manufacturer guarantee and are constructed from 1.5mm premium steel tested to BS EN 442, while aluminium models such as the Ascot heat up faster, require less water content, and carry a 10-year warranty, making them a strong choice for well-insulated homes or heat pump systems.

Are double radiators more expensive to run than single panel radiators?

Double radiators require more water to fill initially, but they heat rooms more quickly and efficiently, meaning your boiler does not need to work as hard or run for as long to reach the desired temperature. For rooms that have historically been difficult to heat, a correctly sized double radiator can actually prove more cost-effective to run over time than an undersized single panel.

What colours are available in double radiators?

Our double radiators are available in white, anthracite, and black across a range of styles, with selected models such as the Nirvana featuring a double powder-coated finish for added durability. Colour availability varies by model, so it is worth checking the individual product page for the specific options on each radiator.

Do I need special valves for a double radiator?

Double radiators are compatible with standard thermostatic radiator valves (TRVs), which are sold separately and not included with the radiator. Browse our full range of radiator valves covering angled, straight, and thermostatic options across a wide selection of finishes to find the right pairing for your radiator.