A burner, comprising: a head at which a combustion zone is defined in which the combustion occurs; a first fuel inlet in which there is an inlet valve for adjusting the quantity of fuel supplied; said first inlet is defined by a duct for conveying the fuel along which the inlet valve is positioned; said duct for conveying the fuel extends in the direction of the combustion zone for feeding the fuel; said inlet valve intercepts the fuel and is configured for adjusting the quantity of fuel in transit through the first inlet towards the combustion zone; a second inlet for the comburent extending in the direction of the combustion zone for feeding the comburent to the latter; said second inlet comprises means for adjusting the quantity of comburent fed towards the combustion zone; said second inlet comprises a duct for conveying the comburent along which the adjustment means are positioned; said duct for conveying the comburent extends in the direction of the combustion zone for feeding the comburent; a device for controlling the combustion comprising second means for measuring the flow rate of the comburent (Va) supplied to the burner; characterized in that said conveying duct extends along a respective axis of extension starting from a respective inlet end of the comburent; said second inlet comprises an element for deflecting the incoming comburent configured for entering the comburent in a radial direction relative to the axis of extension of the conveyor duct via an inlet passage, wherein said deflector element is shaped in the form of a cap positioned on the inlet end of the comburent and having a respective internal cross-section larger than the cross-section the inlet end in such a way as to form a cylindrical air inlet zone between the conveying duct and the deflector element; wherein said second measuring means are interposed along the second inlet along the duct for conveying the comburent; said second measuring means are positioned inside the deflector element between the inlet passage and the inlet end. a head at which a combustion zone is defined in which the combustion occurs; a first fuel inlet in which there is an inlet valve for adjusting the quantity of fuel supplied; said first inlet is defined by a duct for conveying the fuel along which the inlet valve is positioned; said duct for conveying the fuel extends in the direction of the combustion zone for feeding the fuel; said inlet valve intercepts the fuel and is configured for adjusting the quantity of fuel in transit through the first inlet towards the combustion zone; a second inlet for the comburent extending in the direction of the combustion zone for feeding the comburent to the latter; said second inlet comprises means for adjusting the quantity of comburent fed towards the combustion zone; said second inlet comprises a duct for conveying the comburent along which the adjustment means are positioned; said duct for conveying the comburent extends in the direction of the combustion zone for feeding the comburent; a device for controlling the combustion comprising second means for measuring the flow rate of the comburent (Va) supplied to the burner; characterized in that said conveying duct extends along a respective axis of extension starting from a respective inlet end of the comburent; said second inlet comprises an element for deflecting the incoming comburent configured for entering the comburent in a radial direction relative to the axis of extension of the conveyor duct via an inlet passage, wherein said deflector element is shaped in the form of a cap positioned on the inlet end of the comburent and having a respective internal cross-section larger than the cross-section the inlet end in such a way as to form a cylindrical air inlet zone between the conveying duct and the deflector element;