30 bhp 40bhp 60bhp gas steam boiler Horizontal gas steam boiler fire tube steam boiler 30 bhp-600bhp industrial gas steam boiler directly boiler factory Boiler fuel:natural gas, lpg, lng, cng, diesel, heavy oil Boiler pressure:below 2.5Mpa 1.Boiler equipped with autoalarm control system,function are as followed: (1).High and low water level give sound and light alarm. (2).Low water level interlock protection founction. (3).Water level automatic control founction.