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Check to see if anyone is putting stuff down that they shouldn't..sounds odd I know. But I didi a job at a scout hut, kids were putting allsorts down it.

Cavitation happens in liquid when bubbles form and implode in pump systems or around the impellor. Pumps put liquid under pressure, but if the pressure of the substance drops or its temperature increases, it begins to vaporize, just like boiling water. Yet in such a small, sensitive system...

Just seen that you have an elecric shower..doH!!! Like Seco said, scaled up lol

sounds like you may need a new cartidge for the shower. If so 90-100 quid. Find out the make/model and contact the company. If Triton or Aqualisa, they are very helpful. good luck

Just read your note with interest. The correct method to draw off water from a cylinder, regarding your shower, is to use a Surrey Flange. The shower needs iit's own supply and should not be competing with other draw off points, ie taps. Failing that, if you T down 450mm from the hot...

you can buy testing strips to see the concentration of inhibitor in the system. Inhibitor contains the same chemical in different makes. 1 litre normally covers 10 rads. cheers

Listen, if you have a combi, adding inhibitor is easy. Don't listen to these lot, just do as follows: Turn your boiler off and let it cool Turn both valves off to one radiator Partially drain that rad add inhibitor with concentrate...

If you lag it, put it in writing that he wanted that done, get him to sign it. Trust me, u don't want it to go tits up lol

Graham The service pipe should be between 750 and 1350mm depth. If the landlord is insisting on the pipe being above ground and lagged, say no. It's up to you mate, but i would walk away. Cheers