An open type expansion tank should be placed at least how many feet above the highest element?

An open type expansion tank is designed to accommodate the expansion of water as it heats up in a closed-loop system, such as a hydronic heating system. For the tank to function properly, it needs to be positioned at a sufficient height above the highest point in the system. This placement allows for proper water circulation and helps prevent issues related to air pockets or water hammer that could disrupt the system.

The position of the expansion tank must ensure that it can accommodate the pressure fluctuations as well as the expansion of water. A height of at least 4 feet is standard to provide adequate head pressure, which ensures that the water can easily flow from the tank into the rest of the system. Additionally, this height helps to maintain a proper water seal in the tank, allowing it to operate effectively without the risk of introducing air into the system. Hence, a minimum of 4 feet is required to ensure optimal performance and reliability of the expansion tank within the heating system.