Why is maintaining proper temperature in domestic hot water systems important?

Maintaining proper temperature in domestic hot water systems is crucial because it inhibits bacterial growth, particularly that of Legionella, which thrives in warm water environments, specifically between 77°F and 113°F (25°C to 45°C). Keeping the water temperature above this range, ideally at or above 140°F (60°C), helps to prevent the proliferation of harmful bacteria, thus significantly reducing the risk of Legionnaires' disease and other waterborne illnesses.

While taste and mineral buildup may be influenced by temperature, those factors are not the primary concern in the context of health and safety regarding water systems. Legislative requirements, although important, serve primarily to support public health standards rather than directly addressing the prevention of bacterial growth. Therefore, the emphasis on temperature control focuses on reducing health risks linked to bacterial contamination.