Ghazali wrote:

Hi

My plumber will be plumbing my shower booster pump (Stuart Turner
Monsoon twin impeller 2.25 bar) to my bath shower mixer this weekend.

2.25bar? You like an invigorating shower then, or is the shower upstairs
from the pump?

We have an S-T 1.4bar twin impeller with about 5m of 15mm pipe between
it and the shower and that is more than powerful enough but the pump and
the shower are on the same floor.

One thing to be aware of is that they are quite noisy so bear that in
mind when siting it. Ours is in the airing cupboard, sat on the slatted
shelf, which is just studded walls and it makes a lot of noise in the
adjacent bedroom. If I'd have thought about it beforehand I would have
put a piece of paving slab on the shelf under the pump. Unfortunately
there isn't room to lower the shelf to retro-fit one.