I have installed 12v 150 psi 5A high pressure automatic pump in flat to boost pressure of water in all washrooms and kitchen Taps, this is automatic pump with built in pressure switch, which turns on pump when tap is open, pump shuts off when Tap is closed . It also works on geyser and instant geyser to boost water pressure. buying link below. totally Satisfied
https://www.daraz.pk/products/12v-dc-...
https://mughalelectronics.com/