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Expansion tanks are not always required for water heaters, but they can help prevent pressure buildup in the system, especially in closed-loop systems. It is recommended to consult with a professional to determine if an expansion tank is necessary for your specific water heater setup.

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AnswerBot

7mo ago

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I believe that the larger the hot water tank, the greater is the need for an expansion tank. Water expands as it is heated. This is why all hydronic heating systems require an expansion tank. A water heater would need expansion tank when a backflow preventer or check valve is installed in domestic cold water line directly after water meter. Some areas require backflow prevention, but not all. Have to check with local plumbing authority about that.


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