On 25 Feb 2005 06:04:22 -0800, "Vaci" wrote:

I live in a block of flats where cold water is gravity fed from a
large, shared water tank on the roof (about 20 ft above). I want to
install a pump to provide a high-pressure shower, but all installation
guides I've read insist on an independent cold feed from the tank to
the pump, which I can't provide.

Can I still install such a pump if I tee off the hot and cold supplies,
and put check valves on the non-pumped branches to prevent the pump
from sucking water or air back from the taps?

Vaci
Have you got room to fit a header tank in your flat then run your hot
water from that? Then you can also run the cold for the pump off it. I
suspect that would be your only way of getting the shower you want.
The flow from the tank on the roof is probably quite low, have you
checked the litres per minute you get now?

Basil