Vertical gas and oil thermal oil heater is one of the main types of ZOZEN Boiler, with a product capacity of 1.2-25 million kcal, which adopts the packaged delivery and it is easy to install. The furnace body of ZOZENgas and oil thermal oil heater adopts multi-return disc tube structure, and the disc tube is once formed without deformation. In order to improve the energy utilization rate, ZOZEN Boiler can be equipped with waste heat boiler, economizer, air preheater and other energy-saving equipment at the tail of the furnace body according to the actual process conditions of users, to make full use of flue gas waste heat, and the thermal efficiency of the system can reach over 95%.