Lower the temperature on your water heater to 120 degrees or less – a 10 degree (F) reduction in water heater setting can cut 3% - 5% from your bill.
Take short showers instead of baths – it takes a lot of water to fill a bathtub, especially jetted soaking tubs and huge claw-foot tubs.
Insulate you water heater – an insulating blanket helps retain heat, thereby reducing energy consumption. Blankets are made for both gas and electric heaters of various sizes. Be sure to check the “R” rating for maximum benefit.
Laundry – Follow laundering instructions on clothing. Set your washer to use cold water on rinse cycles. Also, many of the newer high-efficiency detergents do a great job with cold water.
Washing dishes – Using a dishwasher consumes less water than washing dishes by hand, especially when you leave the faucet running, and a variety of cycles can save hot water, too. Make sure the dishwasher is full before running it.
Low-flow fixtures – Installing low-flow faucets and showerheads is an obvious and relatively inexpensive way of saving hot water and water in general. Low-flow fixtures can cut water consumption in half and most people don’t notice the reduction because of a more forceful flow.