Intermatic EH10 Water Heater Timer 120 VAC Designed for water heaters, the Intermatic EH10 is a digital 7-day type timer, permitting up to 6 ON/OFF operations each day or 42 ON/OFF operations each week. The minimum ON or OFF time is one minute. This time switch is powered by 120 VAC 60 Hz power supply. You have the o...