ZOZEN Boiler as a leader enterprise in the gas-fired boiler industry always pays attention to the energy-saving and environment protective technology and has received remarkable achievements. In order to make full use of the waste heat and to meet the different requirements of different working conditions, ZOZEN engineers have innovatively designed various types of the energy-saving gas-fired boiler system solutions, such as the condensing type, air preheating type, waste heat boiler type, etc. Through the energy efficiency test, the thermal efficiency of ZOZEN energy-saving gas-fired boiler is over 98%, which is better than the national energy efficiency standard.