"Kettling" Boiler

24 Nov 2003
Reaction score
United Kingdom
:cry: I have a Potterton Kingfisher Open Vented gas central heating boiler with 7 radiators. The boiler developed classic "kettling" symptoms - lots of banging from the boiler that resonates around the system VERY loudly. I thought it was probably limescale baked on to the heat exchanger - a hard water area. I flushed out the system (dirty!) with Sentinel X400 cleanser and added Inhibitor and boiler noise reducer. Matters improved for about a week but now the "Kettling" has returned louder than ever - I am getting woken up before the birds - all suggestions welcome.
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So, if it is limescale, the first method hasn't worked. It's sort of unlikely to be lime, but (if it's scale) you will have to disconnect the boiler, and connect it to a descaling pump which you should be able to hire. Kamco make one which is self-reversing. You will need an acid descaler and it will take a couple of hours once it is connected.

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