About the difference between steam generator and steam boiler? Boiler includes inspection steam boiler and inspection free steam boiler, steam generator belongs to the latter, inspection free reason is "boiler safety technical supervision regulations" provisions, water volume is less than 30 liters, not in the boiler regulation "inspection scope, so belong to the inspection free boiler. Steam generator is called boiler, because the operation principle and boiler are the same, are the use of fuel or other heat energy to heat water, produce hot water or steam mechanical equipment. According to the classification of the boiler inspection station, the steam generator belongs to the pressure vessel, the production and use should be a little simpler. Both in terms of safety: conventional steam boiler water volume is greater than 30L, there is a certain potential explosion, so in order to safety in production and life, the national supervision of the boiler is necessary