Time switches provide control for electric water heaters with to-the-minute accuracy in programming and time keeping. These time switches can be programmed for repeat daily scheduling, 5-day work week scheduling, weekend scheduling or individual day scheduling. Timers can be scheduled for operation during the lowest time-of-day rates. 6 on or off events can be performed daily or weekly. External override switch. LED load indicator. Battery carryover protects time keeping and program information for a minimum of 3 years.