Bathroom showrooms are advising me repeatedly that I need 2-3 bar of pressure for the fixed head shower I am thinking of buying. I have about 0.8 bar (8 metres head). Hot and cold are from a gravity fed communal system (equal pressure). Stuart Turner advise that their pumps will not work on a communal system. Have I found a 'catch 22' or is there a way to boost the pressure of communal systems for a decent strength shower? Your advice gratefully received. Thanks in anticipation.