Clicking or Ticking from Radiators — Is It Normal?
Clicking or ticking radiators are one of the most common concerns homeowners ring about—and in the vast majority of cases, there's absolutely nothing to worry about. When metal heats up, it expands; when it cools down, it contracts. These tiny movements within the radiator brackets create those little clicking or ticking sounds you're hearing, particularly noticeable on newly fitted radiators or those with slightly loose fixings. The good news is that whilst thermal expansion is completely normal and harmless, there are a few straightforward checks you can do to quieten things down if the noise is bothering you. This guide walks through what's causing the sound, when it's genuinely nothing to fret about, and the simple steps to diagnose whether there's an actual problem—like trapped air or restricted flow—that needs attention. If you've tried the basic fixes and the noise persists or worsens, or if your radiators are warming unevenly, it's worth getting a qualified heating engineer to take a look.
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Most likely cause & what to check
A clicking or ticking sound from radiators as they heat up is almost always normal thermal expansion. Metal expands as it heats and contracts as it cools — this creates small clicking sounds as the radiator moves slightly within its brackets.
This is more noticeable on radiators that have been recently installed or have loose brackets. Tightening the wall brackets or placing a thin rubber pad between the bracket and radiator can reduce the noise.
If the clicking is accompanied by gurgling or a rushing water sound, there may be air trapped in the radiator. Try bleeding the radiator — insert a bleed key at the top valve, open slightly until air hisses out, then close when water appears.
A repetitive clicking only when the heating first comes on (not when cooling down) can indicate a thermostat clicking — this is the thermostatic radiator valve (TRV) opening. This is normal.
If one radiator clicks persistently and is unevenly warm (hot in patches), the problem may be a sludge build-up restricting water flow. A heating engineer can flush or replace the radiator.
Clicking from the pipes under the floorboards adjacent to a radiator is usually thermal expansion in the pipe run — see the banging pipes guide for how to address this.
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Frequently asked questions
Is clicking from radiators a sign something's wrong with my boiler?
Not at all—clicking radiators rarely indicate a boiler fault. The noise almost always originates from the radiator itself as the metal expands and contracts with temperature changes. However, if the clicking is accompanied by other symptoms like poor heating performance or unusual boiler sounds, it's worth having a Gas Safe engineer inspect your system.
Why do some radiators click but others don't?
Radiators that click are usually those with slightly loose brackets, newer installations, or positioned where expansion movement is more noticeable. Older radiators that have settled into their brackets, or those installed with rubber dampening pads, tend to be quieter. The radiator's size and material also plays a role—larger steel radiators typically expand more noticeably than smaller ones.
Can I stop my radiators clicking without calling an engineer?
Yes, in most cases. Start by checking and tightening the wall brackets holding the radiator—use a spanner or adjustable wrench. If brackets are already tight, try placing thin rubber pads or felt strips between the bracket and radiator to absorb expansion noise. If the clicking persists along with gurgling, bleeding the radiator usually solves it.
When should I worry about radiator clicking and call a professional?
If a single radiator clicks persistently and feels warm only in patches or stays cool in places, there's likely sludge restricting water flow—this needs professional attention. Similarly, if clicking is accompanied by significant banging, kettling sounds, or if multiple radiators are affected alongside poor heating, contact a heating engineer to diagnose the underlying issue.