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

My boiler has become very loud, crashing and rumbling. I have bled the radiators, but had no effect.

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    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. .please read more on www.fernox.com
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    Kanza 

    answered 2 years ago

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