You can add energy savings by placing a blanket wrap insulation around your water heaters. Additionally, for electric water heaters, you can have a timer added to the power circuit to turn the water heater off in times when there is no usage. For example: Set the timer to turn the water heater off from 10 p.m. to 4 a.m. Most timers can be customized and set for different times so that the water heater is turned off for most of the day and night. This, along with the insulation (which will keep the water hotter longer), can save in energy usage and your energy costs.