The installation instructions for my new (thermostatic) mixer shower specify:
Static pressure must be below 10 bar or seals may leak. Fit a reducer if supply pressure exceeds 5 bar running, apparently 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?
Ben