15 or 22mm?

[Goldspoon]

One thing i don't undestand is the hot water is stored in a tank in the airing cupboard on the 1st floor (same floor as exisitng shower already is and new one is going - hopefully), so in other words the hot water is not above the shower head, so why does the cold have to be?

The cylinder of hot water is FED by the cold water cistern in the loft so the head of pressure IS above

 

[eddg]

look like it has it's own connection to the shower, although i can't be sure until i take it all out, having to look down the gap in the stud wall

 

[eddg]

right goldspoon i see now! thank you