In message , Adrian
writes
Quite how this pressure vessel would feel about having 8 bar pushed
back up its outlet (!) I do not know.....

...but then, I'm not sure how a conventional mains supply would react
either.

My guess is that it would make your neighbours toilets toot like steam
whistles and turn their ablutions into brown vapour.

--
Clive Mitchell
http://www.bigclive.com