If you want to save money on hot water, set the water heater to 115 degrees F. Gas water heaters are generally set at 125 degrees F. I have set mine to 115 degrees F.12 years ago and have never noticed the difference. Electric water heater come set from the factory at 135 degrees F. You can also set electric water heaters to lower temperatures but they have a slow recovery rate. Gas water heaters when set for 115 degrees F. will start the burner when the tank has lost about 5 gallons of water and due to the burner size will heat the incoming water much faster.

Don Merritt