If your radiator is making noise, whether it's clicking, banging, gurgling or whistling, it’s rarely a sign of anything serious, but it is your heating asking for a little attention. In this guide, we’ll explain what each sound means and how to fix a noisy radiator, so your heating looks good, feels great and works exactly as it should.
Why is my radiator making noise?
Most radiator noises come down to trapped air, natural expansion, limescale or a system that needs a little TLC. The good news? Many of these issues are simple to sort once you know what you’re listening for.
Below, we’ll walk through the most common radiator noises and what you can do to quieten things down.
Find the noise you're hearing
Clicking noises from radiators
Clicking or creaking noises are very common, especially when your first switch your radiator or heated towel rail on or off.
Why does my radiator click?
This usually happens when hot water rushes into a cold radiator, causing the metal to expand.
When it cools down again, the metal contracts and that’s the clicking you hear.
How to fix a clicking radiator?
If the clicking only happens briefly when the heating turns on or off, there’s nothing to worry about. However, if the clicking is constant or starts sounding different, it could be worth checking that the radiator is properly fitted and that pipes aren’t rubbing against floors or brackets,
Gurgling noises from radiators
Gurgling usually means your radiator isn't getting the smooth flow of hot water it needs. But why?
What causes a gurgling radiator?
A gurgling sound typically means there’s trapped air in your radiator. Air can get caught inside the system along with the water, stopping heat from circulating properly. This often leads to cold spots - especially towards the bottom of the radiator.
How to fix a gurgling radiator?
Bleeding your radiator is the quickest fix. Switch your heating off and allow the radiators to cool. Using a radiator bleed key, slowly turn the valve anti-clockwise. You’ll hear a hissing sound as the trapped air escapes. Once the hissing stops and water appears, close the valve again.
It’s a good idea to bleed your radiators once a year, ideally before the heating season begins.
If you’re still getting cold spots, sludge could be building up inside your system. Flushing your radiators can help clear this out and restore efficient heat flow.
Why does my radiator sound like running water?
If it sounds like water is on the move, there’s a good chance air is getting in the way - and it’s time to do one simple fix.
Why does my radiator sound like running water?
If you hear water moving through your radiator, it’s usually another sign of trapped air. While radiators rely on water to heat your home, you shouldn’t be able to hear it flowing. Air pockets can interrupt circulation, creating that running or dripping sound.
How to fix radiator making water noises
Once again, bleeding the radiator should do the trick. Releasing trapped air allows hot water to move smoothly through the pipes and the noise should settle down.
Banging noises from radiators
Loud bangs can sound alarming, but they’re often linked to what’s happening elsewhere in the system.
Why is my radiator banging?
Loud banging noises are often linked to ‘kettling’. Despite the name, this usually isn’t caused by the radiator itself, but by limescale building up inside the central heating system.
Homes in hard water areas - such as the South and East of England - are more prone to this.
In some cases, draining the radiator can help release trapped air or water. Always make sure the boiler and gas supply are switched off and the radiator is fully cool before you start.
If the banging continues, it may be time for a professional power flush. This clears out limescale and grime from the system, helping to quieten things down and improve efficiency long-term.
Whistling radiators
A whistling radiator is usually down to air moving where it shouldn’t, and it is often perfectly fixable.
Why is my radiator whistling?
A whistling sound can happen when heated air expands and moves through the pipes, causing them to vibrate. This vibration is what creates the noise.
How to fix a whistling radiator
Start by checking whether sound is coming from the air vents. If it is, adjusting the valves slightly may reduce the airflow and stop the whistling.
If the noise seems to be coming from the pipes, check for loose connections. And if the radiator itself is the culprit, sediment build-up may be to blame. Flushing the radiator can help clear this and restore peace and quiet.
Keeping noisy radiators at bay
A little regular care goes a long way. Bleeding, balancing and cleaning your radiators helps keep them working efficiently - and quietly - for longer.
If you’d like more practical advice, our heating hub is packed with guides to help you get your home ready for winter, tackle common radiator problems and keep every room comfortably warm.
Noisy radiators FAQs
Why is my radiator noisy but still hot?
A radiator can still heat up even if air, limescale or expansion is cousin noise. Noise usually points to efficiency issues rather than failure.
Should I worry about a noisy radiator?
Most radiator noises are harmless, but persistent or worsening sounds are worth investigating to protect efficiency and comfort.
Can bleeding a radiator stop noise?
Yes. Bleeding releases trapped air, which is one of the most common causes of gurgling water sounds and uneven heating.
