Heating system with radiant strips, which comprises: - at least one loop of radiant strips susceptible to be fixed to the ceiling or to a wall of a room to be heated and adapted to be internally traversed by a heated carrier fluid, for heating said room by radiation; - a containment structure; - a recirculation duct housed in said containment structure, susceptible to place an initial section and a final section of said loop of radiant strips in mutual connection; - a burner of premix type, housed in said containment structure and provided with: - a combustion chamber delimited by a cylindrical wall which is extended passing into said recirculation duct for a first section in which it is externally touched by said carrier fluid; - means for supplying a fuel mixture connected to said combustion chamber in which the combustion of said fuel mixture and the generation of combustion products susceptible to heat said carrier fluid occurs; - a cylindrical combustion head; - a ventilator, housed in said containment structure provided with a fan inserted in said recirculation duct and operating in a suctioning fashion to force said carrier fluid into said loop of radiant strips, from said final section to said initial section; characterized in that: - said cylindrical wall is extended for a second section (7") with which it continues into said loop of radiant strips starting from its initial section; - the cylindrical combustion head of said burner is provided with a metal mesh on which the combustion occurs, and it is extended into said combustion chamber for at least the first section of said cylindrical wall thereof, so as to uniformly heat such first section of the cylindrical wall which is externally and uniformly touched by the carrier fluid of said recirculation duct; - the means for supplying said burner comprise: - a modulating blower, which is driven by a variable speed motor, for suctioning an adjustable air flow, - a controlled valve, which is connectable to a source of supply gas, and is connected to said modulating blower to which it is susceptible to send a gas flow as a function of the air suctioned by said modulating blower; the air flow and the gas flow being mixed together in said modulating blower and injected by the latter in mixture form into said cylindrical combustion head to obtain a flame on the cylindrical mesh thereof. - at least one loop of radiant strips susceptible to be fixed to the ceiling or to a wall of a room to be heated and adapted to be internally traversed by a heated carrier fluid, for heating said room by radiation; - a containment structure; - a recirculation duct housed in said containment structure, susceptible to place an initial section and a final section of said loop of radiant strips in mutual connection; - a burner of premix type, housed in said containment structure and provided with: - a combustion chamber delimited by a cylindrical wall which is extended passing into said recirculation duct for a first section in which it is externally touched by said carrier fluid; - means for supplying a fuel mixture connected to said combustion chamber in which the combustion of said fuel mixture and the generation of combustion products susceptible to heat said carrier fluid occurs; - a cylindrical combustion head; - a combustion chamber delimited by a cylindrical wall which is extended passing into said recirculation duct for a first section in which it is externally touched by said carrier fluid; - means for supplying a fuel mixture connected to said combustion chamber in which the combustion of said fuel mixture and the generation of combustion products susceptible to heat said carrier fluid occurs; - a cylindrical combustion head; - a ventilator, housed in said containment structure provided with a fan inserted in said recirculation duct and operating in a suctioning fashion to force said carrier fluid into said loop of radiant strips, from said final section to said initial section; - said cylindrical wall is extended for a second section (7") with which it continues into said loop of radiant strips starting from its initial section; - the cylindrical combustion head of said burner is provided with a metal mesh on which the combustion occurs, and it is extended into said combustion chamber for at least the first section of said cylindrical wall thereof, so as to uniformly heat such first section of the cylindrical wall which is externally and uniformly touched by the carrier fluid of said recirculation duct; - the means for supplying said burner comprise: - a modulating blower, which is driven by a variable speed motor, for suctioning an adjustable air flow, - a controlled valve, which is connectable to a source of supply gas, and is connected to said modulating blower to which it is susceptible to send a gas flow as a function of the air suctioned by said modulating blower; the air flow and the gas flow being mixed together in said modulating blower and injected by the latter in mixture form into said cylindrical combustion head to obtain a flame on the cylindrical mesh thereof. - a modulating blower, which is driven by a variable speed motor, for suctioning an adjustable air flow, - a controlled valve, which is connectable to a source of supply gas, and is connected to said modulating blower to which it is susceptible to send a gas flow as a function of the air suctioned by said modulating blower; the air flow and the gas flow being mixed together in said modulating blower and injected by the latter in mixture form into said cylindrical combustion head to obtain a flame on the cylindrical mesh thereof.