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Expansion Tank

AL_5
AL_5 Member Posts: 1
Hi there.

I need some general information on expansion tanks.

In a hot water system, does the water from the expansion tank ever go back into the boiler?

Is there a special valve that purges water from the tank when the expansion tank is full?

What happens if the tank is full but it is unable to purge or release water to make room for expansion?

Thanks in advance to all those that respond.

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