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What the expansion tank in the heating system?

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First and foremost, the name "surge" suggests that there is excess fluid (water, oil, antifreeze) caused by heating it, with it, the more liquid in the heating system, the greater must be the expansion tank. Second: If you turn off the heating, the excess water will leave the system (during cooling), and due to lack of fluid gets there and the air is formed an air tube which they will have to produce, otherwise the heating will not work. Third: in the process of heating a liquid and can evaporate or leave, that would often not have to refill the expansion tank (Sometimes with a fluid level).
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