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