A brand new tap that only dribbles is almost never faulty. It is a pressure mismatch. Every tap has a minimum operating pressure in bar, and gravity-fed systems often sit well below what a standard tap needs. This guide shows how to work out your water pressure, which specs matter, and how a low-pressure tap like the Ideal Standard Calista runs from just 0.1 bar so it flows properly on old and gravity-fed systems.

