In order to build an environment-friendly thermal oil heater product, ZOZEN Boiler analyzed a variety of low-nitrogen combustion technologies, as well as desulfurization, denitrification and dust removal processes, and reasonably controlled the emission of harmful substances. A single heat transfer oil boiler with a capacity of 1.2 million-25 million kcal and ZOZEN Boiler can design reasonable boiler solutions according to the actual working conditions.