Abstract: The water dispensing system includes sprinkler heads mounted on risers extending through the roof surface and supplied by PVC pipe suspended beneath the roof surface. Alternatively, porous hose may be mounted along the ridges. Water is supplied through an electrically motorized valve and electric motor driven booster pumps. The control circuit includes one or more flame sensor circuits each consisting of an electric current conductor disposed in selectively spaced runs and connected to the coil of a signal relay. Smoke detector sensor circuits include relay switches and operating coils, which coils are activated in response to a selected smoke level. The relay switches are connected by the control circuit to energize the motorized valve and the pump motor. The water flow is initiated either when flame overtakes a run of a flame sensor conductor or when a smoke detector detects the selected smoke level.