A burner suitable for combustion under a MILD combustion, wherein the burner comprises: an annular distribution chamber , the annular distribution chamber anteriorly is in communication with an ejector and posteriorly with radial ducts and delimits externally a transit chamber ; wherein the transit chamber is anteriorly delimited by an outletting front section of the ejector and posteriorly by walls of a case ; a heat exchange system, between recycling flue gases and a comburent is substantially formed by walls of radial ducts , of the annular distribution chamber and of the outletting front section of the ejector , said walls separating the comburent flow from the recycling flue gas flow; wherein the outletting front section of the ejector is perpendicular with respect to the annular distribution chamber that anteriorly is in contact with an outlet cone or a protruding cone ; a first fuel injection system is positioned on the back wall of the case of the burner upstream of the ejector , a second fuel injection system is positioned downstream of the outletting front section of the ejector ; wherein the burner is configured so that the recycling flue gases, directly sucked from a combustion chamber through suction intakes , flow through an annular duck and heat the comburent flowing in countercurrent into the annular distribution chamber , and the recycling flue gases enter the transit chamber driven by the depression created by the comburent outletting a front section of the ejector and mix with the comburent downstream the outletting front section of the ejector , the comburent being the entraining or driving fluid and the recycling flue gases being the entrained fluid. an annular distribution chamber , the annular distribution chamber anteriorly is in communication with an ejector and posteriorly with radial ducts and delimits externally a transit chamber ; wherein the transit chamber is anteriorly delimited by an outletting front section of the ejector and posteriorly by walls of a case ; a heat exchange system, between recycling flue gases and a comburent is substantially formed by walls of radial ducts , of the annular distribution chamber and of the outletting front section of the ejector , said walls separating the comburent flow from the recycling flue gas flow; wherein the outletting front section of the ejector is perpendicular with respect to the annular distribution chamber that anteriorly is in contact with an outlet cone or a protruding cone ; a first fuel injection system is positioned on the back wall of the case of the burner upstream of the ejector , a second fuel injection system is positioned downstream of the outletting front section of the ejector ; wherein the burner is configured so that the recycling flue gases, directly sucked from a combustion chamber through suction intakes , flow through an annular duck and heat the comburent flowing in countercurrent into the annular distribution chamber , and the recycling flue gases enter the transit chamber driven by the depression created by the comburent outletting a front section of the ejector and mix with the comburent downstream the outletting front section of the ejector , the comburent being the entraining or driving fluid and the recycling flue gases being the entrained fluid. <EOS>