Methods and systems and apparatus to support reduced energy and water usage

A processor and memory for use in mapping an in-building water supply installation having:

• a source of water;
• a plurality of controllable water outlets coupled to the source of water;
• in a water flow path between the source of water and the plurality of controllable water outlets, at least one flow measurement device and at least one flow regulator;
• the processor being configured for operative connection to the at least one flow measurement device and the at least one flow regulator;
• and the memory, operatively coupled to the processor, storing instructions that cause the processor to perform a method of mapping the water supply installation in which method the processor:
• processes signals received from the at least one flow measurement device consequent on the opening of a first of the plurality of controllable hot-water outlets at least until a first flow characteristic is determined;
• after the closing of the first of the plurality of controllable water outlets;
• repeating the operations for each of the other controllable water outlets of the plurality to determine for each controllable water outlets a respective flow characteristic;
• thereafter, the processor being configured to:
• identify the opening of a particular one of the plurality of controllable water outlets based on the similarity of a detected flow characteristic to a respective flow characteristic;
• and
• control said at least one flow regulator, based on the identification, to control a supply of water from the source of water to the identified controllable water outlet.