Flue Gas Recovery must have a compact design, air-tight and easy installation. The unit can be utilized by fluid steam and water. It is widely used in heating boiler feedwater and drying equipment. The construction of flue gas recovery is custom following process conditions, the tube material can work at < 1 Mpa with temperature < 130 Deg of C. In corrosive applications, acid resistant materials can be used, other material such as aluminum can be used for heating and ventilation applications. It has better performance when compared to steel due to is thermal conductivity. The working pressure can be up to 2.5 Mpa with temperature range for 70 to 130 Deg of C.