Water Heater Energy Efficiency
Water heating is the second largest user of energy in your home after space heating. It pays to use hot water wisely.
- Energy Factor (EF) rates the overall energy efficiency of water heaters. The higher the EF rating, the greater the efficiency, which means lower on-going operating costs.
- Typical new residential natural gas heaters have an EF of 0.6 to 0.8 EF. Only the most efficient water heaters qualify for the ENERGY STAR® label.
- For a list of current water heaters and EF ratings, go to the Natural Resources Canada website.
- Energy-efficient features are electronic ignition, higher insulation levels, and advanced venting systems.
- ENERGY STAR certified tank systems have an EF of 0.67 or better.
- Tankless systems deliver an endless supply of hot water at an efficiency rate of 80 per cent or higher.
- The ENERGY STAR level for tankless systems is 0.82 or higher.
Combination water and space heating systems
- The energy efficiency depends on the boiler selected. A high-efficiency boiler is needed to deliver energy savings.
It pays to use hot water more efficiently. Here are some simple tips to reduce water heating costs.