At what minimum temperature is hot water defined?

Hot water is typically defined as water that has attained a minimum temperature of 110°F. This is a standard often referenced in plumbing codes and guidelines, as it ensures that the water is adequately heated for purposes such as bathing and cleaning while also reducing the risk of bacterial growth within the plumbing system. At temperatures below this threshold, water may not effectively serve these functions, especially in preventing the growth of Legionella bacteria, which can thrive in cooler water temperatures.

In context, while other temperature options might be associated with hot water in different scenarios, such as specific safety regulations or maximum hot water settings, the minimum standard definition aligns with the established 110°F benchmark for hot water. This understanding is vital for professionals in residential settings who need to ensure water temperatures meet health and safety standards.