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What causes my Baxi Back Boiler to knock (bang) when Hot?

Boiler knocks when first firing up and then when hot without hot water being used. Could it be scaling in boiler or tank ? Any ideas please ?

Tom K
November 2009

Baxi Baxi Back Boiler Heating, Home Heating Systems Baxi Back Boiler Hot

John, Thanks, yes heating working but pump does vibrate often.

Tom K
November 2009

It certainly could be boiler 'kettling' due to scale or rubbish in the system.....I assume the circulating pump is working if the rads. are getting hot.

John
November 2009

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Baxi Back Boiler Knocking - Causes & Fixes