Diesel oil fired boilers using the advanced large hearth furnace gall bellows design technology, enhanced heat transfer, wet back structure, greatly improving the heat transfer, heat transfer, automatically compensates for thermal expansion and contraction stress furnace, high-efficiency, safety and reliability , to extend the normal operation of the boiler cycles, reduce maintenance costs, access to a wide range of applications.it can be used as diesel oil fired steam boiler or diesel oil fired hot water boiler.