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Keep thinking guys its certainly keeping my grey matter working hard! Simond you mentioned it might be the megaflow how would one find out if it was that? I have also found a bleed valve on a rad that just turns both ways without any water coming out(it is not leaking though) its like the...

Thanks chaps for your input, if the leak is in the pipe in the screed, can the pipe be fixed with leak sealer?? Could the boiler be at fault in any way? If so can it be isolated to see if the pressure still drops? Am i clutching at straws?

Thanks Giblets. the developers plumber has attempted to find the problem, like testing the expansion vessel and changing the PRV but no joy. He is away for a week or so then he is going to cut the pipes and try and pressure test which part of the system is leaking. I am just wondering what...

I have moved into a new build, with a oil fired 'grandee' condensing boiler, and direct fed megaflow system. The plumber has changed the PRV and tested the expansion tank which is ok. There is no visible signs of a leak, although the pipes are under the screed on the ground floor! I suppose the...