What should be done to prevent legionella bacteria growth in hot water systems?

To effectively prevent the growth of legionella bacteria in hot water systems, maintaining water temperature and regularly flushing the system is essential. Legionella thrives in temperatures between 20°C and 45°C (68°F and 113°F), so ensuring that the hot water is kept above this temperature range, ideally above 60°C (140°F), is crucial. Regularly flushing the system helps to eliminate stagnant water, which is another key factor in preventing bacterial growth.

This approach not only helps maintain the water at a temperature that minimizes the risk of legionella but also ensures that all parts of the system are circulating water effectively. Stagnation can occur in areas where water is not frequently used, making those sections prime locations for bacterial growth. By addressing both temperature control and stagnation through regular flushing, the risk of legionella becomes significantly reduced, ensuring a safer hot water system for users.