cold water respectively the common line 12 is provided with means for sensing the temperature of water flowing therethrough preferably the sensing means include a thermocouple 32 which communicateswith a microprocessor 34 the first valve 14 likewise communicates with themicroprocessor 34 the second valve 16 is connected to a servomechanism 36 which is capable of opening and closing the second valve 16 in response tosignals from the microprocessor 34 if the servomechanism 36 is an electricmotor the connection between the second valve 16 and the servomechanism ismechanical if the servomechanism 36 is a solenoid the connection is electrical in either case electrical energy is supplied to the servomechanism 36 by an auxiliary source of electrical power not shown the microprocessor 34 is programmed to receive first second and fourth electrical signals and to send or transmit third and fifth electrical signals a mechanical to electrical transducer 38 converts a mechanical force from the first valve 14 into an electrical signal which is then transmitted to the microprocessor the mechanical force originates as a torque when the first valve 14 or more specifically the handle and stem of the first valve 14 is turned this torque is transmitted mechanically to the transducer 38 to which it is mechanically linked and the transducer 38 converts the mechanical force into an electrical signal which it then transmits to the mnicroprocessor 34 an analog to digital converter 40 converts the temperature sensed by the thermocouple as an electrical potential into a numerical value which is then input as an electrical signal to the microprocessor 34 the transducer 38 may for example be an electrical switch which is opened or closed by.