The extraction unit (1) for the extracting of a fluid from a tank (6) is inserted into the tank via an assembly opening (8) and has an immersible body (4) equipped with an extraction pipe and a heat exchanger. A heat exchanger extension (5) in the fitted s...

A fuel cell system and related operating method are disclosed wherein a water storage section (a water storage tank 33), that stores water to humidify a fuel cell 1, is provided with a heat transfer surface (52a to 55a, 52b to 54b) that is heated by hot me...