Sorting out expansion vessel and overtemperature valve

[jack]

9 minutes ago, JohnMo said:

Sorry not read the thread - but an observation this is all G3 related stuff being discussed - should you have a G3 certificate to be playing with this?

 

Good point. I haven't mentioned it in this thread, but I'm absolutely getting a plumber involved. This thread is more about making sure I know exactly what I want done, as in my experience, trades tend to advise what's convenient for them rather than best for you (e.g., the last time I had a G3 inspection, the plumber installed - directly onto the tank- an overpressure valve designed for strictly cold water use, presumably because that's all the local plumber's merchant had in stock and he didn't want to come back again).