Flue gas temperature is between 270 ~ and 300 °C. Air combustion (fresh air) is heated through flue gas up to 50~100 °C degrees. Therefore more efficient combustion occurs through this hot air. 3%~ 5% efficiency can be obtained by decreasing the flue gas temperature to 150~180 °C degree through Recuperator. Regarding this system, you can benefit from flue gas temperature and direct the flue gas up to the air combustion fan instead of realizing it to the outside.

This hot temperature of flue gas feed and support the boiler in order to increase boiler & combustion efficiency.