What measures are taken to prevent the growth of Legionella bacteria in a domestic hot water system?

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....