On Wed, 18 Apr 2012 20:41:37 +0100, Jake wrote:

To elaborate, last house had a massive cold tank in the roof. That fed
hot tank plus shower head in bathroom. Shower pressure was crap until I
put a second massive cold tank in the roof. There was plenty of head of
course but the added surface area on the now two tanks of water
increased the pressure to both the hot tank and direct to shower head.

Surface area of the tanks has nothing to do with it. The pressure is
purely down to the difference in height between the water level in
the tank and the outlet. Something else must have changed when you
installed the second tank, like the water level ...

As to Janet's problem. If the butt tap spigot isn't to big a simple
hose tap connector, length of hose, a male water stop hose end and
female coupler. When you want water just shove the coupler into water
stop hose end. Assuming the water level in the butt is above the end
of the hose of course, might be slow if there isn't much height
differential.

--
Cheers
Dave.