Water-hammer keeps reoccuring

[digisatman]

Hi all,

Just wanted a bit of advice, I have a unvented system boiler I think, and basically for the last couple of weeks whenever I turn the hot water tap (upstairs or downstairs) I get the "Water Hammer Noise" of the pipes vibrating when I close the hot water tap.

I turned the water supply off, let the water/air drain out and then turn supply back on, this fixes the problem for about a day and a half before it starts again.

Anyone have any ideas whats up?

 

[digisatman]

Well it started upstairs in bathroom, but now it happens in the kitchen downstairs as well. The kitchen had its taps replaced last year so I don't think its the washer, and the fact that the problem goes away for a day or 2 once I drain the system leads me to beleive its something else? The noise seems to come from the cupboard where the hot water tank is.