Noisy radiators and clunky pipework can turn a warm home into a worrying experience. Whether you are in Bordon, Whitehill, Liphook, Alton or Farnham, many homes around GU35, GU34 and GU9 experience unusual heating noises at some point. The good news: most causes are minor and easily fixed once you know where to look.
Quick checks you can do now
Before diving deeper, try these simple checks. They often resolve the issue within minutes.
- Check your boiler pressure is between 1.0 and 1.5 bar when cold.
- Bleed radiators starting with the highest in the property.
- Ensure thermostatic radiator valves are fully open while diagnosing.
- Listen for where the noise starts: boiler, pump, pipes or radiators.
What causes central heating banging noises?
When homeowners mention banging or knocking, the issue is usually trapped air, incorrect water flow or expanding pipework rubbing against joists. Homes across Bordon and nearby towns often show these symptoms as systems age or after maintenance work.
- Air in the system: Causes gurgling or bubbling sounds.
- Low pressure: Can lead to kettling and chattering pipes.
- High flow rate: Pump set too fast can cause banging when valves shut.
- Limescale: Particularly in hard-water areas, leading to boiler kettling.
- Pipes expanding: Normal, but loud if not clipped or cushioned properly.
Gurgling radiators and how to fix them
Gurgling is one of the most common heating noises and nearly always comes from air trapped in radiators or pipework. You may notice cold patches at the top of radiators in homes across Bordon, Whitehill and the surrounding GU35 area.
- Turn off your heating and allow it to cool.
- Use a radiator key to slowly open the bleed valve.
- Release air until water flows smoothly.
- Re-check boiler pressure and top up if needed.
Banging pipes and noisy circuits
Pipes that bang or clunk are often reacting to sudden pressure changes. If you hear sharp knocks shortly after the heating starts, it may be water hammer or pipes expanding tightly against wooden surfaces. Homes in Alton, Liphook and Farnham commonly experience this where pipe clips have worn or insulation has slipped.
- Listen for where the sound originates.
- Check accessible pipework for loose or missing clips.
- Reduce pump speed one setting at a time.
- Ensure all radiator valves are fully open when diagnosing.
Rattling radiators and vibrating pipework
Rattling is usually caused by trapped air, loose brackets or fast-changing water flow. A radiator may vibrate against the wall, particularly older double panels in Bordon and GU35 homes.
- Check radiator brackets are tight.
- Ensure pipes entering the radiator are not rubbing against flooring.
- Bleed radiators to remove trapped air.
- Check TRVs are not stuck or partially closed.
Checklist: When to call a professional
- Noises persist even after bleeding radiators.
- Boiler pressure keeps dropping.
- Boiler frequently locks out or overheats.
- You hear loud kettling from the boiler itself.
- Hot water is inconsistent or slow to heat.
Next steps if the noise won’t go away
If you have tried the steps above and the system is still noisy, or you would prefer a Gas Safe engineer to investigate your heating system in Bordon or the surrounding areas, get in touch via (01420) 558993.