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Just posted the boiler details above. The noise is like a jet engine and in just one 10-12ft section of piping upstairs - but only kicks in when kitchen tap downstairs and one bathroom mixer taps are turned on, these are the outlets after this part of the pipe.

Do you mean gas safe registered? If so yes, also a member of the Chartered Institute of Plumbing and Heating Engineering. The new boiler is a Worcester Greenstar Highflow 550cdi (floor standing), manual says max mains fed water pressure 10 bar. I don't imagine there are any specific...

Thank you twgas. Yes, I mean a pressure reducing valve.

Opinions much appreciated... We've had a combi conversion done on the 4 bed house we recently moved into. We have had 5 seperate leaks and have a really loud noise in the property that sounds like water being restricted in a specific part of the piping. The noise is a bit more...

Thank you oilhead, The original installer(s) completely replaced the previous gravity system (just before we moved in so we never expereinced the old one - it was 20+ years old). He installed a new combi boiler (removed cylinder and decommissioned water storage tank in loft). He replaced 2...

Inn case anyone is still monitoring this thread... I have some updates and I'd really love some additional opinions. 2 more plumbers have observed the load noise since. All agree that it sounds as though water is being restricted, and with 6 bars from the main this may be due to a...

Thanks Burnerman :) that seems to make much more sense! I will try to work this out for myself and definitely mention also.

Plumber hasn't mentioned this but I had heard of it but from what I've read this is not the case, no hammering sound - sound is just when tap is on (instantly starts and instantly stops) and is a like a loud engine noise which is constant and continuous - no banging or hammering.

That's what I thought. No dripping taps that i can tell. not sure how to check for cistern valves. There have been 5 seperate leaks since the new system was installed. 1. A pump under the bath broke and water gushed through the kitchen ceiling light fixture (pump was then decommissioned) but...

Thanks so much for your replies JohnD and Armo74. What confuses me if it's pipes vibrating - why would it happen with only some taps - for example both cold and hot in kitchen but only hot in downstairs bathroom not cold? And wouldn't taking the mains pressure right down be likely to lessen...

We've recently had a new combi system installed (Worcester Hi-Flow 550cvi), replacing an old cynlinder/tank system, and are now experiencing really loud noises under the floor upstairs when some of the taps in the house are on. The noise happens only with the taps on, and not all taps create it...