A tank-type flusher (100) includes an intake valve (102), a flush valve (104), and a sensor module (20). The intake valve (102) is connected to an external water source (17) and constructed to close water flow to a water storage tank (16) at about a predefined water level in the water tank (16). The flush valve is constructed to control a flush valve member (112) between a seated and unseated state allowing water to discharge from the water tank (16) to a toilet bowl (13). The sensor module (20) is located at a reference location external to the water storage tank (16).