Boiler kettling treatment

14 Apr 2010
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United Kingdom
Wonder if someone can provide some advice on treating boiler kettling or possible causes.

My Potterton suprima 40l is kettling a fair bit. All radiators heat up fine and equally, it's just the boilers that's noisy. The kettling occurs on both heating and hot water. Abv valve set 0.45 and pump on 2. System was cleaned a year ago x400.

I did measure flow and return at the boiler and found the differential to be about 14 degrees.

I have currently tried x200 which made no difference. Try pump on 3 made no difference. I am not sure what else I can try, so any advice would be appreciated?
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You could try adding some fairy liquid.

And no. I'm not joking;)
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And what effect on the steel components would the chlorides in dish washing liquids have? Only there are system silencers available albeit for more money.
The first thing that I would want to do in a case like this is to measure the power input to the boiler.

Normally that would need an RGI but the OP can do it at the gas meter.

Look up the FAQ for gas rating at the meter. Set the boiler to run constantly such as by turning room stat up to 30 C and do the measurement.

The Suprima 40 is rated at 12 kW output so the input power to be measured would be about 16 kW as its not very efficient.

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A proprietary noise silencer liquid would be better as it does not contain salt.

None of the treatments address the cause, the boiler is still scaled up, they just alter the surface tension of the water.
I thought that X200 does actually dissolve lime scale over a period of time?
Well, their web site says:-

How does Sentinel X200 Noise Reducer work?
Sentinel X200 Noise Reducer gently removes the slight layers of deposit or limescale on heat transfer surfaces and alters the flow characteristics of the system water which together eliminates the cause of boiler noise.
Slight is the word used.

X200 has already been tried anyway.
Agile I followed the far and got 0.040 x 321 = 12.84 KW. Not sure if that helps?

X200 was mentioned but I have already tried it without success. Is there any other products I should be looking at?

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