A hot-water immersion sanitizing system has a primary basin for receiving an unsanitary tool or machine component； a thermostatically-controlled valve with a first temperature setpoint, configured to conduct water from a hot water water source to the primary basin until a thermocouple senses a temperature within the primary basin has reached at least the first temperature setpoint, to interrupt flow to the primary basin upon the thermocouple sensing at least the first temperature setpoint； and an overflow drain to exhaust water while the thermostatically-controlled valve is open； thereby automatically maintaining temperature of water held in the primary basin for immersion sanitizing tools and parts at a water temperature of the first temperature setpoint or greater while automatically selectively interrupting flow of water from the water source under thermostatic control.
