Burners for diesel, single stage, aluminium frame, combustion head with micro adjustment at high efficiency and high flame stability. Extremely compact overall dimensions for the installation inside thermal units, disposition rationalized of the components with accessibility facilitated for the operations of setting and maintenance. In the versions R preheater with control of temperature for soft and secure ignitions also at low temperatures. Complete of connector 7 poles, flange and gasket for installation on boiler, nozzle, flexible pipes, line filter.