hi

here's the PIPE diagram as promised

to from to top of to bottom of [to wall]
pump ceiling cylinder cylinder ----------
1| 2| 3| 4| 5| |
| | | | | ------[joint]
| - - | | | |
| | | connect| | | ********
| -----------------[| | | * boiler *
| | | | | | @ [pump] * *
| | | | | | | | * *
------- | | ********** | | | ********
| shower|| | * cylinder *------[valve]--| |
| pump || | * * | | | |
------- | | * * | | | |
| | | | * *-- | | |
| | | | ********** | | |
| | | | | | | |
| | | | ----------------------------
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[ --- FLOOR --- ]

hope that comes ok and makes sense to someone!

thanks
Kiichi