DIY Doctor

What Pipe Diameters to use for Hot and Cold Supply

Postby HCross » Sat Aug 01, 2015 11:56 am

Hi Everyone,
I'm new to posting in this forum although I have often used it for loss of tips with previous projects.
My situation is this...
I'm redoing my water pipes in my flat which has a 15mm cold feed in.
I have a combi boiler.
I'm putting in pex piping like for underfloor heating as I'm in Hungary and it's standard.
It's a small flat, so total of 2 sinks, loo and bath/shower.
What diameter pipes should I use for my cold and hot?
I was thinking of either
1... 16mm throughout
2... 22mm from cold feed to combi with 16mm branches for appliances
And hot all in 16mm
Please shoot me down if appropriate.

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