full install... pipework

Joined
17 Jul 2011
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Yorkshire
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Hi all
I know that this might be a big ask but anyway.. here goes... any advice very welcome!
I have a bit of a project - see attached.
Could someone please help me with the following:
Have I got the pipework ok for this installation?
Am I be better off doing everything in copper or should I use HEP20 everywhere apart from where its chased into walls?
Can I use 15mm piping everywhere or should I use 22mm?
Thanks
legepe
 

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  • Plumbing1.jpg
    Plumbing1.jpg
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