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Quick update on this and I've managed to answer two of my 3 questions, through trial and error and a spot of luck! Q1. I re-plumbed the shower feed from the mixer, expanding up to 22mm and the pressure reduction was shocking. Even that short run proved a bad move so after a lot of cursing...

I've pretty much got this installed save for reboarding the studwork and mortoring in the pipes in the wall, but want to check a few things before I do that. I've a gravity fed system (tank in loft, HW cyclinder at first floor level) with twin impellor pump fed with 22mm into 15mm flexi's, with...