Make sure your water heater is properly maintained. Drain a bucket of water from the tank once or twice a year to get rid of sediment that can interfere with heating.
If your water heater is several years old, install a water heater insulation blanket, especially in unheated areas, such as the garage. Do not install a blanket on new water heaters – it may cause problems and void the warranty. Check your water heater information or check with a plumber.
Repair leaky faucets. A steady drip of hot water can waste many gallons of water a month along with all the energy it took to heat it.
Letting the water run while you’re shaving or doing the dishes by hand can waste a lot of hot water. Turn off the water whenever you can.
Conserve water by encouraging your family to take showers rather than baths. Showers use about half as much hot water. Installing flow restriction devices/aerators on all faucets will reduce water use. In addition, a two-liter soda bottle filled with water and capped tightly can be placed in the toilet tank to conserve water if it is a older larger tank.