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PostPosted: Tue Sep 26, 2017 11:58 pm 
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Originally, the system was a gravity fed, with copper tank...Bath piped in 22mm.

New system will be mains cold, with unvented cylinder hot...bath, and a shower mixer...

Theres a good amount of 22mm pipe well under the floor that originally fed the bath, should I tee off in 15 for the shower mixer, and keep the bath pipework at 22?

Check valves... will I need to fit for the shower?

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PostPosted: Wed Sep 27, 2017 8:00 am 
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Existing pipe work should be ok, just reduce as you say, but it would be preferable to run new cold feed from the balanced side of the pressure reducing/balancing valve set that comes with the cylinder, to the shower and bath.

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PostPosted: Wed Sep 27, 2017 10:16 am 
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The cold came from the tank along the loft and down through airing cupboard, where the new tank will be. l leave the 22 under the floor then, then when the plumber fits the tank he can connect up to wherever is necessary in the airing cupboard.

The 22 comes up through floor at one end of bath, but I'm turning it the opposite way, so the extra pipe length there, just run that in 15 with tee to feed taps and shower?

Am I right in thinking with the invented system, all pipes will be 15?

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PostPosted: Wed Sep 27, 2017 9:35 pm 
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Only where they finally tee off to each appliance. Up till then would be sized for total use, minimum of 22mm.

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