What Temperature Should a Water Heater Be Set?
Your water heater accounts for approximately 18% of your home’s energy bill. If your water heater is set too high, your energy bill will unnecessarily high each month. On the reverse side, if your water heater is set too low your water may not get hot enough causing short showers, or worse, be at risk of growing bacteria. If you have a water heater with a tank, you are paying to keep the water in the tank hot around the clock. Even at 3 a.m., when everyone in the house is fast asleep, your water heater is warming the water for your use. You can save a little energy and money by decreasing the water heater’s burden.
Don’t set your water heater to anything below 120 degrees, as diseases, particularly Legionnaires' Disease, can develop in the stagnant water inside the water heater, which is quite dangerous.
1) It’s hot enough to keep diseases at bay
2) It’s not too hot to cause scalding burns
3) It will supply enough hot water for most small families and is relatively energy-efficient.
Factors That Affect Hot Water Temperature Setting
These factors are not affected by the kind of plumbing you have (PEX, PVC or copper), how the water is heated (gas or electric) or even if you a tankless water heater.
Still undecided? Set it at 120 degrees and increase the temperature in small increments until you find the perfect shower temperature.