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

An expansion tank plays a critical role in a boiler system by absorbing excess pressure that arises from the heating of water. As water heats up, it expands, increasing the volume of water in the system. Without an expansion tank, this increase in volume can lead to excessive pressure buildup, potentially causing damage to the boiler and other components of the system, such as pipes and fittings. The expansion tank provides a buffer for this increased volume by giving the expanding water somewhere to go, thus preventing the risk of overheating and damage due to high pressure.

This function is essential to maintaining the safety and efficiency of the boiler system, ensuring that it operates within its designed pressure limits. This not only extends the life of the boiler but also enhances the overall performance of the heating system.