Plumbing

Water pressure problem, gravity tank + shower booster pump solution?

Anonymous user 28/02/2024 - 2.56 PM

I just bought an upper 2-floor maisonette flat and upon taking my first shower realised there is no cold water pressure from the shower head, only hot. The bath nozzle has some (weak) cold water pressure. Please see the attached diagram. I think the explanation is that the gravity cold water tank in the airing cupboard (no loft access, it’s fully insulated and blocked off) is below the shower head, measurement ‘x’ in the diagram. This would explain why the bath gets some cold water as it’s below the tank, measurement ‘y’ in the diagram. What is the best way to resolve this problem? One solution I’ve designed is attached. I wonder if I piped the cold water tank down to the lower floor, into a shower booster pump, and back to the upper floor shower – would that give me additional cold water pressure? Notice it would have to pump beyond the height of the cold tank to reach the shower head, distance z + x. Would this mean I’d require a negative flow pump? If the height of x is about 1m, could a standard pump do the job? Thanks for your help. existing system: http://i1337.photobucket.com/albums/o666/laike4/photos-temp-1jpg_zpsf2859f96.jpg proposed solution: http://i1337.photobucket.com/albums/o666/laike4/photos-temp-2jpg_zps1142eb32.jpg