I wanna install a pump like the ones HERE into my hot water system.

Why i hear you ask.......... I live in a ground floor masionette and the hot water tank is 5ft off the ground so as you can imagine the hot water supply is pants, theres more pressure in a baby dribbling

Anyways, advice needed on what one i should get? I was thinking of a flexi pipe from the tank outlet to the inlet on the pump and then from the outlet on the pump to the feed to the taps etc..... So it only needs one inlet and one outlet. It sounds that easy, but i bet it aint

Any ideas.........??