Knocking Pipes

[greener]

Hi All
I have a problem with knocking pipes. When hot supply is shut at any tap there is a knocking sound from the pipes.The hot water is supplied by electric water heater. Any ideas????

 

[Winston]

Is this a new water heater? sounds like pipes knocking from poorly fixed piping. ie as water is taken from mains pressure as turning off supply pipes moving.

 

[petetheplumber]

see if you can identify the main source of the banging and check the surrounding pipework ; hold the pipes one at a time if the banging stops you,ve identified the sourse.
Now all you have to do is cure it , it may just be that a pipe has worked loose and needs reclipping, it could also be the jumper on the tap needs attention.
It also pays to check the mains water pressure, has it increased ? if so just simply turn it back down on your internal stop tap.

 

[greener]

Ok guys thanks for all the suggestions I will check out the pressure and pipes thanks again.