Final answer:
The aquastat is the component of the boiler system that monitors water temperature and controls water circulation.
Step-by-step explanation:
The boiler system component that monitors water temperature and possibly controls water circulation is the aquastat. The aquastat is a device that measures the temperature of the water in the boiler and determines when to turn on or off the circulation pump. It helps maintain the correct temperature range and prevents overheating or underheating of the water.
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