Oil(gas) Fired fire tube Steam boiler WNS series of fuel oil gas-fired boiler is the new patented technology boiler which developed independently by our company. This furnace used to burn the centre of a unique technology, the entire wet back structure, the furnace volume is big, make full use of radiation furnace heat exchanger, and through enhancing the combustion of fuels burnout level, making boiler thermal efficiency improved greatly. This simplifies the furnace heating surface design, especially for the low-power boiler. Features; 1. Reasonable water circulation loop and the unique backwater injector device (hot water boiler), improved water management speed up to avoid the water wall pipe explosion. 2. Energy efficient, strong radiation arch, can guarantee the stability of fuel combustion. High standard, high-quality auxiliary equipment, accessories and automatic control equipment to ensure the boiler safe and stable operation, while reducing the labor intensity of fireman 3. Capacity from 0.1ton/hr-20ton/h