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A breakthrough in high-efficiency design, AERCO’s condensing and fully modulating Modulex EXT boilers support 450 to 3000 MBH hydronic heating systems while delivering a greater degree of operating reliability for customer peace of mind. To achieve the greatest possible fuel savings, each boiler combines independent thermal modules that operate to deliver superior turndown and a range of non-cycling operation not readily achieved by competitive equipment or controls. The Modulex EXT comes standard with a powder coated enclosure enabling outdoor installations. In addition to controlling the boiler according to a constant set point, indoor/outdoor reset or 0-10V signal, one or more units can be integrated via Modbus communications protocol to a facility-wide Energy Management or Building Automation System.