A system for the regulation of water supply temperature, particularly in a domestic setting where multiple users are connected to a common water supply. The system comprises a water mixing chamber with separate inlets for hot water and cold water from a hot water chamber and a cold water chamber respectively, and an outlet for the mixed water. The system includes a pressure regulating device comprising a pressure release valve connected to the water mixing chamber and the outlet. When the pressure at either the hot water inlet or the cold water inlet of the mixing chamber decreases, a portion of the mixed water about to exit the outlet is recirculated to the mixing chamber by the pressure release valve of the pressure regulating device; the temperature in the water mixing chamber is thus maintained within a desired temperature range.