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Advice please,
I am trying to work out what size holes etc are required for pipes to fit through, I am looking at having a unvented hot water cylinder fitted and just wanted to know what size pipe would be used to the hot outlets. I know I need 22mm to the cylinder but not sure what size I need from the cylinder. If you are using mixing taps does the cold supply need to come after the pressure reducing valve or can you take it from the mains and fit check valves to both pipes.
 
FYI you need to be G3 registered to install an unvented cylinder and commission it

22mm off the cylinder normally
 
Normal sized house? Use balanced feed to mixers, 22mm off cylinder and 15mm to all fixtures inc bath should be fine for small to med houses.
 
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