The installation instructions for my new (thermostatic) mixer
Static pressure must be below 10 bar or seals may leak.
Fit a reducer if supply pressure exceeds 5 bar running,
Must fit an expansion vessel on the cold supply if none
in (combi) boiler.
How do I measure the running pressure? The only method
I can think of is a manometer. Which would be pretty damn
big, even if it had mercury in...
The diagram for my boiler (Glowworm 30ci plus) indicates a
"domestic safety valve", and the max specced pressure is 10bar,
so can I assume that it will vent water through the overflow if the
pressure rises above that?