Recent content by Dorsetdweller

Good point thanks

I have an unvented heating system that was installed just under 3 months ago. In the last few weeks the HW cylinder makes a very loud humming/vibrating noise when the HW pump for the secondary feed is on, but makes no noise if the CH is on at the same time. The noise fades in and out and...

I’ve got the same problem. Did you resolve it in the end? Was it the 2 port valve? Many thanks