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Subject Topic: Central Heating Boiler "Kettling" Post Reply Post New Topic
PersonVic Wildish
10/5/2013 at 4:29pm
 Location: Knebworth Hertfordshire
 Outfit:  Vauxhall Insignia SE View Vic Wildish's Profile View Profile   Reply to Vic Wildish Reply   Quote Vic Wildish Quote  
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I've been told that my central heating boiler is "kettling".

Can anyone explain what this is and what can be done to eliminate it?

The boiler makes an irregular clonking and knocking noise from time to time..........

Vic


Person420freindly
10/5/2013 at 4:40pm
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Sounds like lime scale build up in the heat exchanger and/or pump


PersonPhil Ness
10/5/2013 at 4:57pm
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Kettling means it is clonking and knocking from time to time. Like as if it is boiling,which it basically is. Causes can be sludge and limescale build up in the system or airlocks which prevent even flow of the water and therefore even heat flow.


Personmikegalagher
10/5/2013 at 5:43pm
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Drain the system and flush through, then add Fernox or similar during the refill?

-------------
Mike

My advice is worth no more than the price paid for it

Prague May/Jun 2017
Lake Annecy Aug 2017


VangoMan02
10/5/2013 at 9:23pm
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Agree with Mike..I put Fernox cleaner in the system and left fot for a few days and then flushed system through.
I then added Fernox inhibitor which helps reduce slug in system.
The difference is amazing, boiler runs quiet and pressure sits steady on 2 where it is meant to be.
Boiler is only 8 years old but was being given the run around with British gas service guys when getting annual service done...wanted £750 to power flush system and fit magnatec thingy ( which I fitted myself)cost about £90.

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It is a fool who has to say something.


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PersonPhil Ness
10/5/2013 at 11:24pm
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I'd try bleeding the system first, it might just be an airlock, also depending on the boiler and system check the expansion vessel pressure is correct, some are like a football or bladder that counter the pressure in the system, they expand and contract in tune with the heat of the system, if they are low on pressure they can give a false low reading of the system pressure when cold, you top the system up thinking it has lost water and it warms up there is no where for the vessel to expand and it causes a build of pressure ( which can cause the banging and clonking), opens the relief valve and dumps the water out,usually more than you have put in, when it cools you have a low system pressure reading and a pile of air in it. There should be a valve like a car tyre on the expansion tank . As I said it depends on the system whether this applies to you.
If the problem still persists go for the flush and rinse.



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