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This is a two part question... My dad has been told by a plumber that when his conventional boiler needs to be replaced, legislations says that a) he must replace it with a condensing boiler and b) he must put TRV's on his radiators. Is true? Secondly, he has a one pipe CH system (that...

Thanks Chris I've found the brochure for the valve - its http://www.caleffi.com/en_IT/Technical_brochures/01024/01024.pdf I don't think it has a non-return valve. Everthing else in the house is also on the low pressure side, but does seem to be the water tank filling that causes the noise...

Hi, I wonder if anyone can help. My parents have a PRV fitted to the incoming mains in their kitchen, which for months has made an intermittent whirring noise which is driving them crazy. Today I have worked out that the noise happens when the ballcock in cold water tank in the loft is...