You can often replace a water-fed bathroom radiator with a heated towel rail. Before buying, check whether the new connections line up, whether the wall can support the rail and whether it can provide enough heat for the room. Ask your installer to confirm any pipework changes before you order.

Decide what the towel rail needs to do

If the old radiator is the bathroom’s only heat source, start with the room’s design heat loss. Use the bathroom BTU calculator for an initial estimate and ask your heating engineer to confirm the requirement. If you know the old radiator’s model, compare its published output with the proposed rail in the same units and at the same ΔT. Even if the outputs match, the old radiator may have been undersized. If you have another heat source, confirm how much room heat the towel rail needs to provide.

Measure the pipes and compare the technical drawing

With the old radiator in place, record the distance between the pipe centres, where the pipes emerge and how far their centres sit from the finished wall. Note the valve positions and the distance from the finished floor. A panel radiator may have side connections while a towel rail may connect from underneath. Ask your installer to compare the complete pipe and valve arrangement with the drawing for the exact rail.

Allow for valves and pipework changes

If the pipe centres or connection direction differ, ask whether the exposed pipework can be adjusted or whether the floor or wall needs to be opened. Straight valves connect along the same line and angled valves turn the connection through 90 degrees. The best choice depends on how your pipes and the new rail meet. Confirm the pipe size, rail connection and space to operate the valve before ordering. Browse straight and angled radiator valves once you know which connection you need.

Check the wall and space around the rail

Mark out the rail’s width and height and include the valves, projection from the wall and room to hang towels. Check that the door, vanity drawers and shower screen still open. Compare narrow towel radiators for tight spaces or wide towel radiators where there is more wall space. Ask the installer to check the wall construction and the new bracket locations against the manufacturer’s instructions. Existing bracket holes may need making good.

Get the installation quoted before buying

Send the installer a photo of the full wall and close-ups of both valves and pipe entries. Include your measurements, the proposed model’s link and its technical drawing. Ask whether the quote covers removing the old radiator, any pipework changes, valves, fixings, refilling and testing, and making good where needed. If you are considering dual fuel, ask about the electrical work separately.

Frequently asked questions

Can I keep the same pipes?

Possibly. Matching pipe centres helps, but the connection direction, distance from the wall and valve arrangement also need to work. Ask your installer to confirm against the model’s drawing.

Can I replace a panel radiator with a rail of the same width?

Check both the installed fit and the actual heat output. Equal widths do not establish either one.

Supporting guides

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