Legionella bacteria can cause Legionnaires' disease, a severe form of pneumonia, and Pontiac fever, a milder illness. These bacteria thrive in warm water environments, such as domestic hot water systems. Several measures are taken to prevent Legionella growth. Maintaining hot water temperatures above 140°F (60°C) throughout the system is crucial. Legionella bacteria do not multiply at these high temperatures. However, to prevent scalding, especially at point-of-use fixtures, thermostatic mixing valves are us....
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