3rd floor bathroom- poor water pressure fix

[Justpeter]

Advice on addressing poor water flow in our new third floor bathroom. The bathroom is to be on the 3rd floor in the main part of our house, but the feed and expansion tanks are located in the loft of the two storey rear extension of the house. Thus the outlets in the third floor bathroom are almost to the height of the bottom of the feed tank reducing the head and giving very poor flow. The incoming mains water pressure is also low and at best I'd imagine three floors up we are going to get a trickle and nothing more.
The obvious soloution would be to move the feed tank higher, however its as high as possible in the two storeys loft and as the 3rd floor runs into the eves there is no feasible space to move it there. The plumber suggests fitting a negative head or universal pump on bathroom hot and cold feeds via dedicated feeds from the tank appropriate tanks. Is this the best solution it terms of budget and time.?
Also we hoped to Install a power shower in our 2nd floor bathroom at a later date which will also need dedicated feeds, would we have to run separate feeds for those or could we tee off before the 3rd floor pump and feed the power shower from the same feed. ?

Any sensible advice would be helpful.

 

[muggles]

Yep, dedicated feeds and a Stuart Turner Monsoon Universal pump are the way to go. Dedicated means dedicated - your power shower will need separate supplies

 

[Madrab]

Yup, remember to size and type the pump accordingly, feeding 2 power showers will require a significant pump to feed them adequately, as well as the other outlets in the bathroom.
Consideration needs to be given to the toilet as well, may need to run that from the mains otherwise you may not want the pump kicking off in the early hours when the toilet's being used.
May also want to look at pumping the mains if it's feeding below 12L min as you will have issue with the pump draining the tanks faster that they can recover under heavy use.

Just some points you need to consider.