Why Is My Boiler So Noisy When It Is Heating Up?

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2 Answers

lakeesha Hennessy Williams Profile
The most likely cause of a noisy boiler is limescale in the heating system. My recommendation would be to get your boiler looked at as soon as you can.

Ignoring it puts your boiler at more risk, and will mean costly repairs should something else go wrong (trust me, I know!).

Why is my boiler so noisy? As I mentioned above, the chief cause of a grumbling boiler is a build-up of limescale. Luckily, the treatment is fairly simple:

You just need to turn your boiler off, pour a descaler solution into the, 'feed and expansion tank', and leave it for a few days before flushing out.

In most cases, this should be the end of your boiler woes.

My boiler is still making noise, what should I do? If descaler hasn't done the trick, here's a couple of other possible causes that you should investigate:

  • Try turning the thermostat temperature down. Sometimes the simplest answer is the most effective.
  • There may not be enough water flowing into your boiler (this is something that a plumber will need to investigate further).
  • Similarly, a lack of water pressure could be causing a pesky gurgling sound - again a pro should be called to get a full diagnostic.
Anonymous Profile
Anonymous answered
Boiler noises are practically always caused by deposits of either lime or hardened black iron oxide sludge (Magnetite - Fe3O4).

The substance generally considered as 'lime' is more often a mixture of mainly calcium carbonate (chalk), with smaller amounts of calcium sulphate (gypsum). The insulating properties of chalk and gypsum vary.

Minor films can cause major temperature increases of the boiler metal and lead to lower efficiency, noises and early depreciation.Implosive forces and the associated noise are naturally greatest if the surrounding water is cold.

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Anonymous