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When installing an expansion tank, the maximum allowable working pressure (MAWP) of the boiler system is a crucial factor to consider. This is because the expansion tank must be designed to operate safely within the pressure limits of the overall system. An expansion tank serves to absorb excess pressure caused by thermal expansion of the water in the system; hence its pressure rating must match or exceed the MAWP to prevent failure and ensure reliable operation.

The MAWP ensures that the expansion tank can handle the system's operative stresses without experiencing leaks or ruptures, maintaining the integrity and safety of the entire boiler setup. Consideration of this factor helps in selecting appropriately rated equipment that will function effectively over the life of the boiler system.

While other aspects like the temperature of the fluid, the size of the boiler, and the length of the piping system are relevant to the overall design and functioning of the heating system, they do not directly impact the pressure containment capabilities of the expansion tank, making the MAWP the primary focus when installing this component.