After more than thirty years of development, ZOZEN Boiler's product line now covers a variety of specifications including gas-fired boilers, biomass boilers, coal-fired boilers, circulating fluidized bed boilers, and thermal oil boilers. ZOZEN's thermal oil boilers can adapt to various fuels such as natural gas, biogas, coal, and biomass. They are categorized into three series: the YQW series oil/gas-fired horizontal thermal oil boilers, the YQL series oil/gas-fired vertical thermal oil boilers, and the YLW series coal/biomass horizontal thermal oil boilers.