Pipe Sizes

[Barnman]

How do I wok out wha pipe sizes I need to run both for central heating and hot/cold to bathrooms and kitchens. There are instances where there are two ensuites next to each other and I was thinking of 22mm and spur off with 15mm to the taps. For the rads something similar.

 

[linkyplumb]

I would say 22 mm then reducing to 15mm for the heating.
As for hot water depends on what system you have.
If it is a combi then 15mm would be OK.If it is indirect or even unvented then I would run cold 15mm and hot 22mm then reduce down to feed basin showers etc.

Graham

 

[Barnman]

What about using 10mm to the rads and the taps. Maybe using the John Guest manifold that is a 22mm to 10mm with 4 10mm outlets.

 

[onlyfitidealboilers]

are you a diyer or a trainee plumber?

 

[Biggles..]

Rocket manifolds work ok,prefer the long line ones.

Only trouble with rockets are that you 10mm should only run a maximum length so you need to position the spot on.

10mm cold feed to toilets is also a useful tip.

 

[Barnman]

I am a diyer doing a self build. i do intend getting a plumber but will also be doing work myself.