The best energy performance option is to replace the existing system with a new high-efficiency system, including tank-type, instantaneous or combination space and water heating models. Compare carefully for your best selection. Match the size of the heater to your needs: bigger tank-type units are typically less efficient than smaller units, especially if your hot water demand is low. Use sizing charts available from the manufacturer or retailer.

There are more energy-efficient options now available, including ENERGY STAR® certified units and solar hot water heating systems. Find the most energy-efficient model for your needs.

Energy saving tips for DWH systems

Here are some ways to save on hot water bills:

• Use less hot water: fix leaks and drips, wash clothes in cold water, use low-flow showerheads and restrictive aerators on faucets.
• Locate the water heater close to point-of-use or use small-diameter piping and run it directly from the tank to each point-of-use.
• If the point-of-use is 9 m (30 ft.) or more from the water heater, install a demand-type hot water recirculation system.
• Install an insulated base and an insulating kit around the tank for electric tank type water heaters located in basements.
• Insulate both metallic and plastic water lines with a minimum of RSI 0.7 (R-4) compatible insulation (i.e. pre-formed type).
• Install a drain water heat recovery unit on the main stack(s) serving the shower(s).
• Install a solar water heater to pre-heat the water for the DWH system.