Hello, Im staying at Terrace which doing reno now.

I'm going to install a centralise pump near to my tanky , so that it boost up my whole house water pressure, so question arise, in this case

1. do i need to buy water heater with DC pump? would this increase my water pressure / may potentially decrease the water pressure ( if let say the water input pressure from pump is higher than the water heater could produce )

2. Does anyone had a good rain shower to suggest? Currently, I'm looking for alpha reno-i / bosch tronic 8000s , any user review ? please share... ( bosch is quite new, i'm not sure how good is the pressure output, and my family like hot and high pressure shower )