A heater arrangement system for a water provision system for controlling a water supply provided to a water outlet, the water outlet being arranged to provide heated water to a user, the heater arrangement system comprising: a water heating device disposed remotely from the water outlet; and a control unit communicatively coupled to the water heating device, the control unit being configured to: receive a request from a user to enable a reduced temperature water supply mode, which provides for heated water to be supplied to the water outlet at a first temperature for a fixed period of time and then provides for the temperature to be lowered to a second temperature once the fixed time has elapsed; and for a user for which the request has been received, upon detecting that the user has opened the water outlet, providing heated water at the first temperature for a first period of time, then reducing the temperature of the heated water from the first temperature to a second temperature lower than the first temperature after the first period of time has elapsed.