There is disclosed a bidet seat housing in which are front and rear water jet nozzles and director members through which to pass water one or the other of the nozzles via a solenoid-operated diverter valve connected to the outlet fitting on top of an elongated horizontal water tank adjacent one end thereof, such tank having its inlet fitting on top adjacent the other end connected to a water supply line via a solenoid-operated pressure regulator. An external mode selector effects operation of one of either one of the solenoids or of a warm air blower for supplying warm air blower at the rear of the seat. The water tank contains a heater and a sensor with a temperature sensitive resistor. A control module has circuitry of which the sensor resistor is a part, and effects operation of the heater as needed to maintain water flowing through the tank at the desired temperature. Maintenance of such temperature is effected by construction of the inlet fitting so that it injects water into the top of the tank adjacent its inner surface and parallel to its axis towards the outlet end, and of the outlet fitting having an air escape opening adjacent the inner surface of the tank. A pressure switch operable from weight on the seat must be closed to permit any operations, and an over-temperature thermal switch on the tank stops the system when water temperature exceeds a predetermined level.