How should an expansion tank be installed to ensure proper operation?

Installing an expansion tank vertically is crucial for ensuring its proper operation. When an expansion tank is positioned vertically, it allows air to naturally rise and stabilize above the water within the tank. This air cushion is essential as it absorbs the excess pressure caused by thermal expansion in the plumbing system. A vertical installation also helps maintain the correct functioning of the tank's diaphragm, which separates the air and water, ensuring that the system remains balanced.

Other orientations, such as horizontal or diagonal placements, can disrupt the necessary air-water interface, potentially leading to inadequate pressure control and a malfunctioning system. Installing in a compact space could also limit the tank's ability to perform effectively, as it may restrict access for maintenance or cause issues related to the air cushion. Thus, a vertical installation is deemed most effective for the optimal performance of an expansion tank within plumbing systems.