New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test 2025 - Free COF Practice Questions and Study Guide

Question: 1 / 400

What is the function of an expansion tank in a boiler system?

To store excess fuel

To accommodate the expansion of water as it heats up

The function of an expansion tank in a boiler system is to accommodate the expansion of water as it heats up. As water is heated, it expands. If there were no mechanism to deal with this increase in volume, pressure within the system could rise to unsafe levels, risking damage to the boiler and connected components. The expansion tank acts as a buffer, allowing this expanded water to flow into it, which helps maintain safe pressure levels in the system.

When the water cools and contracts, the water that was previously displaced into the expansion tank returns to the boiler system. This balance is crucial for the efficient and safe operation of the heating system, ensuring that pressure does not exceed design limits during heating cycles.

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To increase water circulation

To maintain a constant pressure

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