... class 3.oil hot water boiler in china 4.professional 5.special design Oil Hot Water Boiler IN ChinaDetailed Product Description ... ,less investments\:we use efficiency threaded pipe,so hot water boiler that the output water temperature ≤150 ... , divided into biomass steam boiler, biomass hot water boiler, biomass hot air stove, biomass thermal oil furnace, ... .5) 26(23) 33 50 oil hot water boiler in china