LOOK IN THE INSTRUCTIONS AND SEE WHAT THE MIN PRESSURE IS FOR THAT SHOWER TO RUN. MUST ARE ABOUT 1BAR, AND CHECK TO MAKE SURE YOUR MAINS PRESSURE IS GOOD. IT IS ALSO ILLEGAL TO FIT A PUMP TO THE MAINS SUPPLY. THEM PUMPS ARE WHEN YOUR FEEDING YOUR SHOWER FROM A LOFT TANK.HI-SPEC PLUMBING
HI-SPEC PLUMBING, October 2006