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Increasing the size of water pipe from mains to the boiler and/or hot water tank is a good idea. It is also good to increase the size of the first branch(es) of the hot water towards shower or bath. Increasing other pipes may take some of the flow from the shower/bath. On all hot water runs you need to consider how much water sits in the pipe. 25mm plastic holds about 2.25 times as much as 15mm copper so it takes longer for hot water to reach your tap and more heat is wasted sitting in the pipework once the tap is turned off.
Charlie_L
@lynx
In a non kitchen conversation in a flat, how about this. Looking to re place the kitchen as non sealed worktops and shit doors and NO STRAIGHT EDGES...so decided to run a new water pipe down to the main. Pipe to be a 25mm blue plastic one, up from the 15mm copper. Thinking of replacing all the water pipes so that the pipes and stop taps are all one size. At the mo the pipes go 15mm, 20mm and what ever else the stop taps are. Not that worried about the loos but concerned with hot water to the bath/shower with anything else on.
I think this is a good time to the pipes as I am redoing the flat. That is a good idea? Looking to run replacement pipes for the central heating too as they are currently buried in the floor. The pipes have leaked once so may leak again so would it no be easier to have the pipes ready to go no need to hack the floor?
Thanks for listening.