The invention relates to an economizer device having an expansion vessel provided with a pressure sensor Cp, a temperature sensor CT on a hot-water intake Ec, four valves, a non-return valve preventing the water from the cold-water intake EF from entering the expansion vessel, and an electronic board connected to the sensors and to the valves. The economizer device stores the cooled water coming from the hot-water intake in the expansion vessel until the water reaches a set temperature that is sufficient for supplying a point of use of a domestic installation using hot water. When the expansion vessel fills, the stored cooled water is preferably used as cold water to supply either the point of use with cold water or else another domestic installation provided to use cold water.
展开▼
