Take one look at Burnham's all new MPC™, Multi-Pass Commercial boiler, and there is no question that it is setting new standards for cast iron commercial boilers. The MPC has been engineered from start to finish with specifications that meet or exceed the competition in every way from the 3-pass sectional cast iron design, conveniently located single 4-inch supply and controls manifold, and a specially designed Return Water Mixing Tube (RWMT) to a rugged commercial grade jacket and Burnham's uniquely integrated Sage Boiler Control (SBC™) system. Packaged and firetested, MPC boilers are the only American-made commercial cast iron boilers to carry the UL Listing. In addition, the MPC is the first commercial boiler of its kind to be completely manufactured in the U.S.A. by an American company Burnham Commercial.