Minnesota Boiler License Practice Exam 2025 – All-in-One Guide to Passing with Confidence

Question: 1 / 400

What is the purpose of an expansion tank for a hot water boiler?

To allow for expansion and contraction of water volume at varied temperatures

The purpose of an expansion tank in a hot water boiler system is to accommodate the expansion and contraction of water volume as temperatures change. When water is heated, it expands, and without a designated space to absorb this increase in volume, pressure can build up within the system. This excessive pressure can potentially lead to system strain, leaks, or even failures. An expansion tank provides a safe space for the expanded water to flow into, thus ensuring that the system operates smoothly and efficiently without risking damage.

The role of the expansion tank is crucial for maintaining system integrity and safety. By allowing for this expansion, the tank also helps to stabilize the pressure within the system, contributing to the longevity and reliability of the boiler.

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It has little value and could be plugged

The expansion tank will hold the extra water needed for operation

None of the above

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