The Pennant CP also features an exclusive, built-in, fully automatic bypass system that prevents low temperature return water from causing condensation on the heat exchanger (which can damage or even destroy the boiler over time). To prevent condensation within the unit, cooler return water (as low as 50°F) is automatically mixed with some of the heated water produced by the boiler to raise its temperature to 120°F, effectively preventing condensation without requiring additional external by-pass piping, balancing valves, or constant adjustments.
 
Pennant CP units are available with or without a built-in pump, and, for applications that require greater heating capacites, individual units may be stacked on specially-designed racks. Multiple boiler installations also allow for boiler rotation (to extend operational life), redundancy (for backup purposes), or both.