The present invention relates to a method of determining a liquid level in a boiler (12) of an apparatus (10) having a temperature sensor (24) for sensing a temperature (T) which is indicative of a temperature of the liquid inside the boiler (12), comprising the steps of: inducing a temporary deflection of the temperature (T) sensed by the temperature sensor (24); determining an evaluation temperature (T ev ) sensed by the temperature sensor (24) after inducing the deflection; and determining the liquid level from at least the evaluation temperature (T ev ). Advantageously, the invention provides that the evaluation temperature (T ev ) is determined by monitoring the deflection and by defining an extreme value (T max, T min ) of the deflection as the evaluation temperature (T ev ). Further, the present invention relates to an steam generating apparatus adapted for executing such a method, a domestic appliance having such a steam generating apparatus.