we are working in several projects in Europe that are pursuing LEED certification. In what relates to sanitary equipments performance, in Europe all the relevant local standards consider 3 bar as the reference pressure to determine water efficiency levels. Due to this, all the manufacturers use this pressure (3 bar) in its technical documentation.

It is being really hard to find equipments / manufacturers with technical datasheets referring performance at 4 bar pressure.

Given this, and since in Europe the standard pressure used is 3 bar, can we consider water performance for our proposed equipments at 3 bar pressure?