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Bell & Gossett expansion tanks are an important component in any hydronic heating or cooling system. These tanks are designed to absorb and store the thermal expansion of water that occurs when it is heated. The primary duty of an expansion tank is to maintain the proper pressure in the system and to protect it from damage caused by excessive pressure.The first primary duty of an expansion tank is to absorb the thermal expansion of water as it is heated. When water is heated, it expands, and thi …