First, contractors must understand the value of a primary/secondary piping system. Optimizing Boiler PerformancePrimary/secondary piping systems are a standard technique often employed in commercial applications to create hydraulic separation between multiple-boiler systems and radiation circuits. In a primary/secondary piping system, there are two sets of pumps, the system pump or distribution pumps and the boiler pump(s). Without hydraulic separation, end users can experience undesirable conditions, including interfering circulators, lower boiler efficiency and improper heat delivery. This improved versatility and precise control of flow rates is critically important for maintaining the high efficiency of a condensing boiler.