Are you seriously asking yourself if you are kidding? I know that this is a section for beginners, but without exaggeration ... let me tell you this - with these data, the task is unsolvable. Power cannot be converted to temperature, but you can calculate, for example, by how many degrees the temperature of the water in the tank will rise under the influence of the heater for a certain time, you can also determine the limit temperature, but you need to know the parameters of the heated medium and the thermal resistance between it and the environment. These are not so simple calculations, they require taking into account many factors.