Moss firebox firetube coal boilers provide large radiant and convection sections for conservative steam supply for the process load. Our firebox boiler offerings range in size from 150 - 600 HP with design pressures from 15 - 150 PSIG. These boilers can also be provided for hot water applications. Extended mud legs are generally supplied on Moss firebox boilers providing extra heating surface, larger furnace volumes and lower heat releases, while promoting fast steam production. These large conservative combustion and radiant zones promotes complete combustion with low heat releases and clean emissions. This allows for lower particulate, CO and NOx emissions. The firetube convection zone of our boiler is conservatively designed to scrub gases efficiently and produce steam quickly.