MACUK S-SR is a substation for heating and instantaneous domestic hot water with two plates heat exchangers: the fist one to divide the primary circuit to the secondary circuit, the second one for DHW production.It is suitable for apartments, single family house and central heating systems.Its installation is fast and easy. It is ready to be connected with the hydraulic connections on the premises.Several accessories are available to fulfill all equirements.- heat meter and cold water meter with pulse exit M-Bus ready- heat meter and cold water meter with radio transmitter- ultrasonic heat meter- thermostatic kit 30-60°C suitable for low temperature heating systems- electronic control kit consisting of: electric servomotor 230V, digital heating controller and remote control with room sensor.The production of domestic hot water is controlled by a thermostatic valve, by the heat exchanger and thanks the 2-way proportional valve which ensures an instantaneous production of DHW at the right temperature, avoiding water waste and delay.