What water temperature prevents the spread of Legionella, the bacteria that causes Legionnaires disease?
Legionella cannot survive at water temperatures above 131 degrees Fahrenheit but it thrives at temperatures between 105 and 115 degrees. To ensure your water is Legionella-free it is recommended that your water heater be set to 140 degrees. Installing a water mixing valve will mix cold water with your hot water preventing scalds, but eliminating the risk of Legionella in your water.
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