What temperature should my water heater be set to?

Your water heater should be set to 60°C (140°F) for optimal safety and efficiency. This temperature kills harmful bacteria like Legionella while preventing scalding and minimizing energy waste.

Most water heaters come factory-set around 60°C, but it's worth checking yours with a thermometer at a hot water tap after running it for a few minutes. If you have young children or elderly family members, you might consider installing anti-scald mixing valves at fixtures rather than lowering the tank temperature, as this maintains bacteria-killing heat in the tank while delivering safer water at taps.

In Ottawa's climate, maintaining proper water heater temperature is especially important during colder months when incoming water temperatures drop significantly. Your water heater works harder in winter, and a properly calibrated temperature setting helps maintain consistent hot water while controlling energy costs. Never set your water heater below 49°C (120°F) as this creates ideal conditions for dangerous bacteria growth.

Temperature adjustment should be done carefully - gas water heaters have a dial near the bottom, while electric units require removing panels to access thermostats. If your water heater is older or you're unsure about the controls, it's safer to have a licensed plumber verify and adjust the temperature settings.

For optimal performance, also check that your temperature relief valve is functioning properly and consider annual maintenance to keep your system running efficiently. If you're experiencing inconsistent water temperatures or your energy bills seem high, it might be time for a professional inspection of your water heating system.