I am currently replacing the house bathroom, there is an exsisting 15mm feed from the hot storage tank on the ground floor upto the bathroom that fed an old Mira power shower this shower was fine as regards to flow. Q is the digital mixer box will sit in the loft just below cold tank, Aqualisa say use 22mm up to the mixer so if I replace the current 15mm plastic with 22mm then it will come off the tank in 15 then increase to 22 to loft space then down to 15 going into mixer unit, will this be effective or should I just extend the current 15mm (plastic) 1.2m into loft? phew does that make sense
