Hi! Our boilers pressure getting lower now so will need to fill up soon to get hot water but im not sure which gauge to open. Any chance for a detailed guidance? Thanks a lot in advance.
Turn the circled valve 90 degrees so it's vertical. Turn back to horizontal when the pressure gauge shows between 1 and 1.5 bar. It would have originally had a plastic handle but yours is missing.
.... and next time the system is drained get the two valves at either end of the flexible changed for ones with levers - makes it much easier.
Thanks everyone for the help. I turned the the circle valve with pliers and filled it up then turned it back to the original position but tiny bit of water still seems to be coming out of it.