Abstract: A system for periodically flushing accumulated sediment from hot water tanks including a drain valve controlled by an electric actuating means capable of rapid actuation of the valve from its normally closed position to a fully open position. The electric actuating means is electrically connected to a timing means, such as a time clock, for actuating periodic flush cycles. A flush cycle begins when the appropriate signal commands the actuating means to open the valve and ends upon closure of the valve. The invention contemplates that the duration of each flush cycle will depend on the water tank size, and that a series of flush cycles will provide optimized flushing of sediment from the tank.