Confused about how to find an energy-smart water heater? Take a minute to learn about water heater efficiency ratings and what to look for on the labels.
Energy factor
The energy efficiency of a water heater is measured by its energy factor. This number, shown on the EnergyGuide label [see below], shows the unit's overall operating costs, taking into account the burner and heat exchanger efficiencies, as well as heat losses from the water tank.
The higher the energy factor, the better. An energy-efficient natural gas water heater will have an energy factor of at least 0.58; look for an energy factor of 0.87 for electric models.
The EnergyGuide
Almost all home appliances, including water heaters, dishwashers and clothes washers, display a prominent yellow-and-black EnergyGuide.
This label developed by the Federal Trade Commission - now simplified from previous versions - can help you figure out how the appliance will affect your utility bills.
View a sample water heater EnergyGuide [PDF format]
The largest number on the guide states the estimated annual operating cost of the appliance. Some equipment, such as ovens or clothes dryers, may have two large numbers - one for electric, one for natural gas.
One of the most helpful features of the EnergyGuide is a sliding scale that compares the appliance you're looking at to other models and brands. When you're comparing appliances, be sure to compare between models of similar size and capacity. |
