Heating and cooling units
Except for heating and cooling units, the water heater is your home’s largest energy user. Unless you need a higher temperature for a dishwasher, set your unit for 120º F. Turn it off when you go away for more than a few days.
If you have an electric unit, find out if your power company offers off-peak rates. Schedule bathing, laundering, and dishwashing for these periods, or just prior to them. You need to have a special meter installed. It’s usually on a circuit with a timer set to run the water heater during off-peak hours.
Does your water heater feel warm when you touch it? It’s losing heat. Wrap it with an insulating fiberglass blanket available as a kit. Take care not to cover a gas unit’s top or to block the air flow to the gas burner at the bottom.
If you are buying a new water heater, get a super-insulated energy-saving model. Putting extra insulation on an old, less-efficient water heater, won’t save much.