AERCO International introduces the Modulex EXT boiler series that offers consulting-specifying engineers and facility managers best-in-class performance in a variety of light commercial and commercial applications. Designed for hydronic heating systems, units operate from 321 MBH to 1,123 MBH and have unmatched turndown of up to 24:5:1 for optimum fuel savings, superior operating reliability and wide installation flexibility. The Modulex EXT achieves high performance due to a unique design that incorporates multiple high-capacity, low-emissions burners. Each 160,500 Btu/hr. thermal module independently operates to increase turndown range, while the simultaneous low-fire operation design helps maximize operating efficiency. The Modulex EXT series features up to 99% efficiency and turndown ranges from 7:1 to 24:5:1.