Evaporator device for water, in particular for a steam cooker as a cooking device, wherein - the evaporator device includes a water tank having an exterior wall, - a heating device having at least one heater circuit is provided on the exterior wall, - the at least one heater circuit includes at least one heating element, - within the water tank is provided an interior partition wall extending spaced to the exterior wall and defining an interior area within the water tank, - between interior partition wall and exterior wall is an exterior area, - the water tank has a water inlet and a steam outlet, - at least one temperature sensor of a first type is provided on an exterior side of the exterior wall, - the temperature sensor of the first type is applied as a laminar coating on the exterior side of the exterior wall, characterized in that - a dielectric insulation layer is applied on the exterior side of the exterior wall for the temperature sensor of the first type, - the heating elements of a heater circuit are applied above the dielectric insulation layer, - a cover layer is provided above the heating elements, - a measurement electrode is provided on the cover layer, - a measurement device is connected to both the measurement electrode and to the heating elements and configured for detecting a current flow between the heating elements and the measurement electrode for evaluation as a measure for a temperature variation on the heater circuit and the water tank, respectively, in the region close to the heater circuit, - the insulation layer is applied directly on the exterior side of the exterior wall and covers a major part of the total surface area thereof. - the evaporator device includes a water tank having an exterior wall, - a heating device having at least one heater circuit is provided on the exterior wall, - the at least one heater circuit includes at least one heating element, - within the water tank is provided an interior partition wall extending spaced to the exterior wall and defining an interior area within the water tank, - between interior partition wall and exterior wall is an exterior area, - the water tank has a water inlet and a steam outlet, - at least one temperature sensor of a first type is provided on an exterior side of the exterior wall, - the temperature sensor of the first type is applied as a laminar coating on the exterior side of the exterior wall, - a dielectric insulation layer is applied on the exterior side of the exterior wall for the temperature sensor of the first type, - the heating elements of a heater circuit are applied above the dielectric insulation layer, - a cover layer is provided above the heating elements, - a measurement electrode is provided on the cover layer, - a measurement device is connected to both the measurement electrode and to the heating elements and configured for detecting a current flow between the heating elements and the measurement electrode for evaluation as a measure for a temperature variation on the heater circuit and the water tank, respectively, in the region close to the heater circuit, - the insulation layer is applied directly on the exterior side of the exterior wall and covers a major part of the total surface area thereof.