WNS series automatic gasoline fired boiler is horizontal, three-pass, wet back shell oil fired boiler. The main structure includes: Boiler shell, Bellows furnace, Returns burns room, Threaded gas pipe, etc. The shell and the furnace are made by 20g boiler special steel. Furnace & Returns burns room, Tube plate & Boiler shell and Returns burns room & Returns burns room cylinders are connected by the method of flanged edge connecting. The specification as below here is more heating surface to spare in order to assure of running of full load and overcharge.