I may be wrong but it sounds to me like your overall local water main pressure isn't good enough to support multiple outlets running at the same time, from post #7
" I also measured the pressure from a washing machine outlet (after my 3 bar megaflo prv) and got just over 1 bar pressure, with both taps running. Static pressure before the prv is 4 bar."
drops to just 1bar! I highly doubt upping the size to 28mm will help at all but that's my opinion and not fact...
" I also measured the pressure from a washing machine outlet (after my 3 bar megaflo prv) and got just over 1 bar pressure, with both taps running. Static pressure before the prv is 4 bar."
drops to just 1bar! I highly doubt upping the size to 28mm will help at all but that's my opinion and not fact...