Pump operated plumbing fixtures with overflow detection

The plumbing fixture for receiving flushable waste comprising: a receptable (12) for receiving the waste; a tank (17) for storing a volume of water; an electrically operated pump (22) having an inlet in communication with the interior of the tank and having a pump outlet coupled to the receptable; a sensor (44) that produces a level signal when the water in the tank reaches a given level; an input device (46) operable by a user to produce a flush signal; and a controller (40) connected to the sensor, the input device and the pump, wherein the controller responds to the level signal from the sensor by operating the pump to deliver water from the tank to the receptable thereby preventing the tank from filling with an abnormally large mount of water, and responds to the flush signal by operating the pump for a predefined interval to deliver water from the tank to the receptacle, wherein the controller senses a magnitude of voltage supplied to the plumbing fixture and alters the predefined interval in response to variation of the voltage.