Cooktop (PC) comprising: - a plurality of premix burners (BRN) provided each with a flame spreading cap and with means for regulating the power thereof including corresponding mix valves , each burner comprising a mixing chamber for the gas and air entering the same through one or more groups-orifices (403-404) wherein each mix valve is - in turn comprising one or more air orifices 403 and one or more gas orifices 404, - set up to allow the corresponding burner (BRN) a predetermined partial power (Pp.1, Pp2); - air and gas conduits to supply said groups-orifices (403-404); - a fan (FAN) for supplying said air conduit ; - a control unit (SFT) to enable/disable one or more of said burners (BRN), through solenoid valves (SSV; SV) and upon the signal of flame detectors (FD) associated to one or more of said burners (BRN); - a command unit (CMD) which in turn has functional links to receive/send signals and inputs from/to at least - said means for regulating the power of the burners BRN to operate them and/or know their status, - a control dashboard (CC), - the said fan (FAN); wherein said plurality of burners (BRN) are arranged in one or more cooking zones whose two or more burners (BRN) present are one adjacent to the other in such a way that there can be substantial continuity between the flame spreading caps of the contiguous burners (BRN) - said caps being shaped to produce a bed of flames which goes substantially up to their edge. - a plurality of premix burners (BRN) provided each with a flame spreading cap and with means for regulating the power thereof including corresponding mix valves , each burner comprising a mixing chamber for the gas and air entering the same through one or more groups-orifices (403-404) wherein each mix valve is - in turn comprising one or more air orifices 403 and one or more gas orifices 404, - set up to allow the corresponding burner (BRN) a predetermined partial power (Pp.1, Pp2); - in turn comprising one or more air orifices 403 and one or more gas orifices 404, - set up to allow the corresponding burner (BRN) a predetermined partial power (Pp.1, Pp2); - air and gas conduits to supply said groups-orifices (403-404); - a fan (FAN) for supplying said air conduit ; - a control unit (SFT) to enable/disable one or more of said burners (BRN), through solenoid valves (SSV; SV) and upon the signal of flame detectors (FD) associated to one or more of said burners (BRN); - a command unit (CMD) which in turn has functional links to receive/send signals and inputs from/to at least - said means for regulating the power of the burners BRN to operate them and/or know their status, - a control dashboard (CC), - the said fan (FAN); wherein said plurality of burners (BRN) are arranged in one or more cooking zones whose two or more burners (BRN) present are one adjacent to the other in such a way that there can be substantial continuity between the flame spreading caps of the contiguous burners (BRN) - said means for regulating the power of the burners BRN to operate them and/or know their status, - a control dashboard (CC), - the said fan (FAN); wherein said plurality of burners (BRN) are arranged in one or more cooking zones whose two or more burners (BRN) present are one adjacent to the other in such a way that there can be substantial continuity between the flame spreading caps of the contiguous burners (BRN) - said caps being shaped to produce a bed of flames which goes substantially up to their edge. <EOS>