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.