300mm or 350mm Towel Radiator: Comparing the Fit

Quick answer: A 350mm towel radiator uses 50mm more wall width than a 300mm model. Our ranges have 300mm and 250mm pipe centres respectively. Compare chrome and black versions by complete installation size, usable height and listed output before deciding whether the additional width helps.

Published 4 November 2026

Choose the usable width, not just the available gap

A 300mm or 350mm body can work as a shortlist for a relatively slim wall. Neither should be chosen simply because its nominal width is smaller than the gap between two fittings. Valves, brackets, projection and the towels themselves also need consideration.

Start with the main narrow towel radiator guide if you have not yet measured the space. This article focuses on deciding between these two neighbouring widths once the general position has been chosen.

Body widths and connection centres

These connection centres follow the 50mm difference used in our towel radiator ranges. Other designs can differ. Existing pipe spacing after the valves are fitted is a separate installation check; do not use body width as a direct measurement of the floor pipes.

What does the extra width change?

The wider body changes the horizontal space occupied and may change the available hanging layout. Compare photographs together with the actual dimensions. Online images are often displayed at similar sizes, which can hide a 50mm difference.

Check how you fold your towels and where the hanging gaps sit. A wider rail is not a guarantee of capacity for a particular number of towels. A model’s height and arrangement can be just as relevant to everyday use as the overall width.

Could a shorter, wider rail suit the wall?

If a cabinet or shelf limits height, compare a suitable 350mm model with a taller 300mm alternative only after checking their outputs. The outlines may solve different layout problems. Do not estimate warmth by multiplying the rectangular width and height of the bodies.

If height is available, our tall narrow radiator guide covers reach and access. Consider who will use the rail and whether the convenient hanging gaps are within reach, rather than treating the top of the radiator as the only point that matters.

Will either width provide enough heat?

Ask an installer to confirm room heat loss and the output of each exact shortlisted model. Insulation, glazing, external walls and the system’s temperatures affect the decision. A small floor area is not enough information to choose a radiator.

CIBSE Journal explains why radiator output depends on flow, return and room temperatures. That is particularly relevant when adapting a system for lower temperatures. Use our narrow towel radiator output guide for the next checks; do not choose the 350mm model merely because it is wider.

Black and chrome: compare the selected version

Both widths are available to browse in chrome and black ranges above. Start with fit and output, then decide how the finish works with nearby taps, handles and shower fittings. Black can create a clear outline; chrome reflects surrounding colours. Neither effect establishes heating performance.

Check the finish of the valves separately. A compatible connection and accessible controls come before a colour match. Radiator-only purchases exclude valves; choose any add-on after the pipe route is confirmed.

Replacing an existing 300mm or 350mm rail

Switching between the two widths also changes the listed centres by 50mm in these ranges. The old brackets may not line up, and the wall projection may differ even if the new height matches. Ask for confirmation of the complete replacement arrangement before booking installation.

Our replacement guide for a restricted wall provides a measurement checklist. If neither width leaves adequate access, consider whether the 200mm or 250mm ranges or a different position would be more appropriate, rather than making an awkward fit permanent.

Sources and product checks

• CIBSE Journal: radiator sizing for lower-temperature heating

Sources support the general heating and safety points linked above. Dimensions, supplied fittings and range examples refer to Cheap Radiator’s listings. Check the selected product and ask your installer to confirm suitability.