In the process of moving my existing bath, current pipe work 22mm hot water, 15mm cold water. Having my boiler and c/h system upgraded in the next few months and was wondering if bath hot water needs to be 22mm or could it be changed to 15mm. The new boiler being installed is a viessmann vitodens 24kw on a sealed system, it is going to have a grundfos 15-60 pump and myson 3 port making it fully pumped(which means nothing to me) as i am moving the bath before the work is carried out, thought i would install the correct size pipework before the heating engineer starts, incidentally the bath is being moved approx 5 metres further than it's original position.
Thanks for any help given
Thanks for any help given