Water heating is the second largest energy expense in buildings: it typically accounts for about 18% of utility bills after heating and cooling.

To save energy end reduce emissions the installation of energy efficient electric water heaters. wherever possible, is recommended. In addition to that  the water heater temperature should be lowered, and the thermostat set at the lowest temperature that provides with sufficient hot water. For most buildings, 40°C water is fine (about midway between the “low” and “medium” setting). Each 1°C reduction in water temperature will generally save 10–15% on water heating costs.