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Thanks Kev. Do you agree that since I have to remove the valve I'm better going for surface mount for future maitenance, etc. Someone told me Bristan valves are good? I do live in a very soft water area (supplied from Thirlmere &/or Haweswater from the Lake District!!) Cheers.

I have a shower mixer valve that is behind the wall and needs to be replaced. Obviously a swine to get at behind the tiled wall. I will replace it with a surface mounted mixer valve to avoid repetition of 'demolition' in the future. I am thinking of the Mira excel which has an excellent...

After all this plumber tried a new pump, system now working. Doh!!! Impeller must have been defunct I wasn't there when he did it so did not see. Thanks for your help & support. Cheers :)

Thanks Gazza. I've been working away so I am no further on with my system. You're experiences bear out my own views that somehow, due to the system configuration, it is entraining air. I am going to do what you did with the plumber sketch out the system and get back to basics on the...

Thanks kevplumb. Yeah we tried that even with the pump both ways round. Plumber reckons we need to put in a more powerful pump. I am concened about this since system worked before. My intuition (for what it's worth with plumbing matters!!!) tells me there is a blockage or restriction...

Pump checked out as OK. Any ideas? Given that it all worked on the powerflush should we try a more powerful pump? I am not a plumber hence why I have to hire one, I am technically minded, but this has got both of us totally stumped. Any help please??!!

kevplumb/nicho75 Thank you both for the advice I'll get the plumber onto it. You definitely think it's a pump problem??

I have a central heating system with apparently no flow. The plumber has spent two full days working on it. All components, pump, 3-way valve. room thermostat. boiler controls are all working. The system was checked out for air locks with new vents even installed to facilitate bleeding. The...