non return valve

[solutions]

I know andy remember the boiler pressure if its a combi has nothing to do with cold apart from filling ,
It depends if his tap is spitting air or suckin air for a start, you said a leak but even with a leak there would always be pressure behind the supply not allowing the level in the pipework to drop, unless :smile5: poor pressure, thats why i wonder if its mains or tank fed, or an aerated spout gone mental,,,,

your logic is sound. I am thinking along the exact same lines given the original post. To know for sure what may be causing it would take a visit, to give a more accurate guess would need much more thorough, detailed and precise information regarding the install.

 

[starbs]

thanks for the response guys a bit more background on the install as follows the water pressure in the house is poor this is a supply fault from the mains. There is no CWSC so water supplied to the loft is from the mains not a header tank. The install has been pressure tested and there where no leaks. Mt thinking was that if the draw water off in the family bathroom this will possibly drain water from the pipe work in the loft conversions en-suite hense me thinking fitting a NRV would stop this drain down happening

 

[AWheating]

it may work, fitting a low pressure swing valve. Prob would be better to repipe if possible and if water pressure is that poor fit a pump on the cold main?

 

[Centralheatking]

Why not pop an aav on to the the offending pipe run CHK