TCC - a thousand thankyou's !
Just bled the air out of the tank using the valve you mentioned and now the water temp is a steady 55C and the temp gauge no longer rockets to 103C when trying to keep up with the flow.
Sure was a lot of air in the tank, had to re-pressurize the system , but all good now and best of all no more grief from the missus about the shower running hot / cold etc.
The installer can now simply bleed the rest of the rads as they have quite a bit of air in them.
PS - the vent valve was closed but after I bled the air out I closed it again as I'm not sure about leaving it open in case it should fail and so leak water.
Just bled the air out of the tank using the valve you mentioned and now the water temp is a steady 55C and the temp gauge no longer rockets to 103C when trying to keep up with the flow.
Sure was a lot of air in the tank, had to re-pressurize the system , but all good now and best of all no more grief from the missus about the shower running hot / cold etc.
The installer can now simply bleed the rest of the rads as they have quite a bit of air in them.
PS - the vent valve was closed but after I bled the air out I closed it again as I'm not sure about leaving it open in case it should fail and so leak water.