On Sun, 30 Sep 2007 13:13:57 -0700, ociaravella wrote:

1) What would be best a vented or unvented mains pressure HWC?
2) Would increasing the header tank by a meter benefit the shower
much? (at present theres only bout 1/2m drop from the tank to the
shower.

Have a look at:
http://wiki.diyfaq.org.uk/index.php?..._Water_Systems
http://wiki.diyfaq.org.uk/index.php?title=Showers

--
John Stumbles

Xenophobia? Sounds a bit foreign to me.