SOFC system comprising: - a fuel reformer for reforming a gaseous hydrocarbon stream and steam into a hydrogen rich gas, - a solid oxide fuel cell stack including an anode and a cathode for electrochemically reacting the hydrogen rich gas and a cathode air stream to produce electricity, an anode exhaust stream and a cathode depleted air stream, wherein the anode exhaust stream and the cathode depleted air stream are kept separate, - a burner for combusting a mixture of the anode exhaust stream and a fresh air stream to complete combustion and produce heat for the reformer, wherein the fresh air stream is fed to the burner, - the fuel reformer receiving the gaseous hydrocarbon stream and steam, wherein - the fuel reformer and the burner are integrated in the same unit for compactness, better heat integration and less heat losses. - the heat generated in the burner is transferred to the reformer to control the pre-reforming rate in the reformer, - a control unit and a blower is provided, the control unit being configured to control the mass flow rate of the fresh air stream by blower such that the reformer is provided with heat to reform the gaseous hydrocarbon stream and steam, and such that a burner exhaust stream provides sufficient heat for generating steam, - at least one heat exchanger, which is an evaporator, is arranged after the burner to cool down the burner exhaust stream and to heat condensed water to generate steam, - the steam from the heat exchanger is fed to the fuel reformer, - the burner exhaust stream is cooled down to produce condensed water, so that there is no need for an external water line, wherein a temperature sensor is arranged for sensing the temperature of the hydrogen rich gas, wherein the control unit is responsive to the temperature sensor to control the blower to maintain the oxygen content of the burner exhaust stream within a preselected range in order to provide sufficient heat to the reformer. - a fuel reformer for reforming a gaseous hydrocarbon stream and steam into a hydrogen rich gas, - a solid oxide fuel cell stack including an anode and a cathode for electrochemically reacting the hydrogen rich gas and a cathode air stream to produce electricity, an anode exhaust stream and a cathode depleted air stream, wherein the anode exhaust stream and the cathode depleted air stream are kept separate, - a burner for combusting a mixture of the anode exhaust stream and a fresh air stream to complete combustion and produce heat for the reformer, wherein the fresh air stream is fed to the burner, - the fuel reformer receiving the gaseous hydrocarbon stream and steam, wherein - the fuel reformer and the burner are integrated in the same unit for compactness, better heat integration and less heat losses. - the heat generated in the burner is transferred to the reformer to control the pre-reforming rate in the reformer, - a control unit and a blower is provided, the control unit being configured to control the mass flow rate of the fresh air stream by blower such that the reformer is provided with heat to reform the gaseous hydrocarbon stream and steam, and such that a burner exhaust stream provides sufficient heat for generating steam, - at least one heat exchanger, which is an evaporator, is arranged after the burner to cool down the burner exhaust stream and to heat condensed water to generate steam, - the steam from the heat exchanger is fed to the fuel reformer, - the burner exhaust stream is cooled down to produce condensed water, so that there is no need for an external water line,