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The recommended safe temperature range for a public hot tub is typically between 100°F and 102°F. This range is advised for several important reasons related to health and safety.

Temperatures above this range can pose risks, especially to vulnerable populations such as children, pregnant women, and individuals with certain medical conditions. The body's ability to regulate temperature diminishes with prolonged exposure to high temperatures, which can lead to overheating, dehydration, and other heat-related illnesses. Keeping hot tub water within the 100°F to 102°F range helps ensure that users can enjoy the benefits of hydrotherapy and relaxation without exposing themselves to these potential hazards.

In contrast, temperatures set at 103°F to 105°F may be tolerable for some experienced users but are still considered a higher risk for prolonged exposure, while ranges above 105°F increase those risks significantly. Anything greater than 107°F is generally considered unsafe and is not recommended for public use due to the potential severe health implications associated with such high temperatures.