Hi all,

Just wondering if anyone can shed some light. After we had the
overflow valve in our immersion tank changed, the plumbing 'buzzes'
for a minute or so after you run any cold or hot water (the latter is
equivalent to running cold water as of course the immersion then fills
from the cold supply).

It's a pretty simple system - no CH as yet - just a cold supply to the
kitchen and bathroom and immersion. The sound is a vibrating buzz, you
can even feel it if you put your hand on a cold water pipe.

Airlocks? Gremlins? Christmas Pixies? Any advice gratefully received.

Charlie

It's a pretty simple system - no CH as yet - just a cold supply to the
kitchen and bathroom and immersion. The sound is a vibrating buzz, you
can even feel it if you put your hand on a cold water pipe.

Sounds like it might possibly be insufficiently clipped pipes and high water
pressure. Get your static pressure measured. If it is much over 4 bar, you
may want to install a PRV. In any case, ensure that all pipework is securely
attached to the building.

I'm assuming that the cold supply is mains to all outlets. If not, it could
just be a noisy ball valve in the cold tank.

Christian.