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Why you should choose Taco Expansion tanks. Water, when heated will expand (thermal expansion), and if there is not enough space to accommodate the excess steam and water, you might have numerous problems. An expansion tank comes with two sections and each side is separated by a diaphragm. This allows the expansion tank to push the steam across, without the need for any manual operation. The fundamental function of an expansion tank is seeing that there is no bursting of units or pipes. Whe …