Very loud noise when hot water is run

[matsmiggs]

Hi, my problem is similar to others on here but not identical so I would like to describe exactly what happens. Hopefully someone can help.

I have just bought a flat (approx 5y old). There are no radiators, the hot water tank just supplies the taps. It is not a gas bolier, just a hot water tank heated by 2 immersion heaters.

When I run hot water, after 10 secs or so I hear a really loud noise. It sounds like a fog horn coming from somewhere near the tank but I can't identify exactly where.

I think it is related to the water re-filling the tank as it does not start immediately and continues for some time after I stop running the water.

I am not sure if this is related, but if i run the hot water for a long time (fill a bath), I get the loud noise and then the flow rate slows right down. It seems like it takes a few days to recover the normal flow rate.

Any help would be very much appreciated. Thanks

 

[nickso]

you need to get the ballvalve looked at.

 

[sambotc]

Sound's like the problem could be the ball valve which feed's your CWS tank. If the sound is definatly coming from the cylinder, and seeing as you live in a flat i would presume the tank maybe a fortic. This means the tank which fill's your cylinder is built into the top with a lid on top. If this is the case, this is where you will find the ball valve, probably just need's a clean and a new rubber?

HTH Sam

 

[matsmiggs]

OK, Thanks a lot. I'll take a look.