A system for detecting a possibility of boiling over and preventing said boiling over, the system comprising a vessel (101) having a lid (102), the lid (102) being characterised in that it is configured: to receive information on an initial level of a vessel content and a current level of the vessel content; and based on a difference between the initial level and the current level as well as the time of a creation of said difference: to instruct, by means of a controller (203), a height actuator (207) of the lid (102) to extend said lid (102) vertically, in order to extend the height of said vessel (101); and to instruct, by means of a controller (203), an aperture actuator (206) to create an aperture in a top of the lid (102) in order to facilitate exchange of heat.