Cooktop comprising: - a plurality of premix burners 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 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 a predetermined partial power (Pp.1, Pp2); - air and gas conduits to supply said groups-orifices; - a fan for supplying said air conduit; - a control unit to enable/disable one or more of said burners, through solenoid valves (SSV; SV) and upon the signal of flame detectors associated to one or more of said burners; - a command unit 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, - the said fan; wherein said plurality of burners are arranged in one or more cooking zones whose two or more burners 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 - said caps being shaped to produce a bed of flames which goes substantially up to their edge. - a plurality of premix burners 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 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 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 a predetermined partial power (Pp.1, Pp2); - air and gas conduits to supply said groups-orifices; - a fan for supplying said air conduit; - a control unit to enable/disable one or more of said burners, through solenoid valves (SSV; SV) and upon the signal of flame detectors associated to one or more of said burners; - a command unit 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, - the said fan; wherein said plurality of burners are arranged in one or more cooking zones whose two or more burners 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 - said means for regulating the power of the burners BRN to operate them and/or know their status, - a control dashboard, - the said fan; wherein said plurality of burners are arranged in one or more cooking zones whose two or more burners 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 - said caps being shaped to produce a bed of flames which goes substantially up to their edge.