Article 13 3.

Member States shall require new buildings, where technically and economically feasible, to be equipped with self-regulating devices for the separate regulation of the temperature in each room or, where justified, in a designated heated or cooled zone of the building unit and, where appropriate, with hydronic balancing. The installation of such self-regulating devices and, where appropriate, hydronic balancing in existing buildings shall be required when heat generators or cooling generators are replaced, where technically and economically feasible.