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I had this boiler fitted 5yrs ago and ran it at 75c for the first 3 yrs and it seemed ok. I then upped it to its max temp. 2 yrs ago and then noticed what I thought was cavitation which started at 70c and disappeared when it reached 82c and modulating. I have the programmer set on hot water only...

I have ordered a non contact thermometer of the net (amazon) for £10.99.

Suggest you turn your cylinder stat down to 50c which will give 70c approx. 80c will scald.

I recently had a cylinder coil leak and the heating sucked out all 40 years of sediment out of the cylinder and dumped it in heating system. So give the system a good flushing before fitting the cylinder.

Try different pump speeds.

Dirty water pump not strong enough. Clean water sump pump is ideal, I have just used this idea myself. Bought from screwfix for £35. My boiler is in the bathroom cupboard. I removed heating pump and connected sump pump. Sump pump stood in a bath full of water.The return from the heating system...

40 year old indirect cylinder coil recently ruptured and contaminated the heating system. 2 power flushes have cleaned pipework and rads but not the heat exchanger. Have used x800 twice and got lots of black magnetite out and some particles of rust, but boiler starts kettling as it approaches...

I recently changed my old indirect cylinder because it had a split heating coil. five years ago we had fitted a new glow worm 12hxi to our open vented system. the system is acting up kettling etc. after trying various additives and flushing i have come to the conclusion the problem is in the...