Repair leaking faucets. Warm-water leaks should be given immediate attention because they can raise your electric consumption rapidly.
Drain your hot water tank regularly to remove sediment.
Consider a tankless water heater; they are 35-45 percent more efficient, pay for themselves in 3-5 years, and never run out of hot water.
Wrap the hot water heater in an insulation blanket.
Lower the thermostat on your hot water heater. For each 10 degrees of reduction, you can save 3-5 percent in energy costs. 120°F is suggested unless your dishwasher does not have its own water heater, in which case 130°F – 140°F is suggested for optimal cleaning.