Determining the appropriate capacity of a thermal expansion tank involves calculating the volume increase of water as it heats. This calculation ensures the tank can accommodate the expanding water, preventing over-pressurization in a closed plumbing system. For example, a residential water heater typically requires a smaller expansion tank than a large commercial boiler system.
Selecting the correct tank volume is critical for protecting plumbing components and ensuring system longevity. Undersized tanks can lead to pressure relief valve discharge, wasting water and potentially damaging property. Historically, expansion tanks were not always standard, leading to frequent plumbing failures. Modern building codes often mandate their installation to prevent such issues.
