Model M5M is engineered for steam applications up to 500 psig or process water temperature to 410°F (210°C). The packaged watertube boiler to meet current energy and emissions standards while achieving NOX emissions of less than 20 ppm and CO emissions of less than10 ppm for natural gas across the firing range. This boiler is available in capacities ranging from 47 to 143 hp. The integral, premix burner and linkageless control automatically adjust the air/gas mixture for maximum efficiency and optimum turndown. The burner achieves a symmetrical 360°, even-temperature heat output to provide clean combustion.