The control of water temperature for the source of supply should be controlled by asse 1017 listed mixing valves.
Thermostatic control valve water heater.
Turn off the shutoff valve at the cold water line that attaches at the top of the tank.
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Commonly used in washdown applications these systems include a temperature regulating valve with an internal check valve and vacuum breaker to prevent backflow two ball valves for manual control of the water supply a dial thermometer that displays the outlet temperature and a hose rack for storage.
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Turn the water heater thermostat control to the pilot position.
These valves can also be used for re circulation systems to maintain domestic hot water supply temperatures at levels temperatures above 55c 131f that prevent the growth of harmful bacteria such as legionella.
The advantage with thermostatic valves is the direct control over output temperature.