Periodically we get a noise when we turn on any hot tap if no hot water has been drawn for 6-8 hours. It's a house that we had built 8 years ago, I think the system is called an "unvented system" i.e. there is no header tank with the traditional ball valve, just a large tank in a cupboard in one of the 1st floor rooms as per the image below. The smaller tank on the left is one that periodically I have to pump up to about 40psi as instructed by the plumber.
The noise only lasts for a few seconds but it's quite loud. Our plumber has been and stopped it before but if I know what to do I will do it myself. I am reasonably handy but not a plumber ! Really would appreciate any help. Thank you.
The noise only lasts for a few seconds but it's quite loud. Our plumber has been and stopped it before but if I know what to do I will do it myself. I am reasonably handy but not a plumber ! Really would appreciate any help. Thank you.
