coil indirect cylinder

Hi, I have two indirect water cylinders (Gledhill) connected to a gas boiler (Vaillant). The system is setup/programmed so that the tanks heat up twice a day for about 2 hours. When the tanks start to heat, one of them makes a loud vibrating noise, sometimes for about 15-20 mins, sometimes for...

This is maybe related to another problem I posted about a few days ago, but a new problem has now come up As mentioned, by mistake shut down water supply into house, was off a few hours and realised only when all taps went dry. Got system running again, switched on taps starting from highest one...

Hi all, newbie DIY-er here, I was adding some TRV valves to old radiators in my new/first home, and drained the system. Everything went ok, radiators working well once more. However, after a day I noticed the hot water tank was cold, and the feed & return pipes also cold. It is a standard...

This is a hotwater outlet pipe I need to turn off to change bath tap, but cannot find how to do so..what is this highlighted appendage on the pipe...what does it do, doesnt look like close off valve or is it missing something? ..Thank you.