Loud and constant noise on running hot water taps

[johnmalkinson]

I hope someone will be able to offer me advice, or let me know if I need to call in a professional to deal with this.
Whenever I run any hot water tap, I hear a loud and constant low frequency noise (like a very loud hum), loud enough to get complaints from neighbours. If the washing machine is filling at the start of a cycle (does it use hot water from the immersion heater), I also hear the noise but not as loud.
The noise seems to occur when the storage tank in the loft is re-filling. I replaced the ballcock and valve in the tank but no difference. If I lift the ballcock to stop water flow, the noise stops immediately. If the valve is fully open, the noise also stops.
When I hear the noise, I can get rid of it by running any cold water tap. I think it is a pressure problem. I tried to close the mains tap a little, but it didn't seem to make a difference.
Can anyone offer any advice, or do I need to get someone in?
Thanks
John

 

[Dotty]

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[Dan]

You'll find more up to date threads than this in the main Pluming Forum. But I'm reply to this so we bump it up the list and get the pages indexed correctly because of the new update we've had. So just ignore this if it's all old news.

If you do reply, keep it polite and professional. You can disagree with the above posts, and just be professional with your reply.