Reduce your water heater's temperature

Why? Water heating accounts for up to 20% of a typical home's total energy use. Lowering your water heater temperature from 140°F to 120°F can result in savings of up to 10% on water heating costs.
Step by step:

Check the owner's manual for safety instructions before making any changes to your water heater's settings.

  1. Measure your current water temperature. Your water heater thermostat may be inaccurate, so it can be helpful to measure the water with a thermometer at the tap farthest from the water heater. If the water's temperature is above 120°F, proceed to the next step.  
  2. Mark the temperature setting and lower temperature. Using a marker, make a mark on the dial before turning the thermostat down so you can adjust later if needed. Lower the temperature setting. 
  3. Wait and re-measure. After a few hours, measure the water temperature again with a thermometer and adjust as needed until you reach 120°F. 
  4. Mark the temperature. Once you have reached 120°F, mark the setting on your dial for future reference.

Good to know: Note that if your dishwasher does not have a booster heater, a water temperature of 130-140°F may be necessary. Consult your owner's manual for information.

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