Abstract: A modular fuel cell system (1) is provided, especially for use in vehicles, with a fuel cell module (2), which has a stack (7) of a plurality fuel cell elements (6) between a first end plate (4) and a second end plate (5), with a burner-heat exchanger module (3), which has a heat exchanger (10) for preheating cathode gas and a burner (11) for reacting fuel cell waste gases.

Abstract: A burner system, especially for a vehicle heater, includes a fuel atomizer arrangement (20) for feeding fuel into a combustion chamber, a fuel pump arrangement (16) for feeding fuel, which is under pressure, to the fuel atomizer arrangement (20), as well as a pressure regulator arrangement (26) for setting the fuel pressure in a fuel line area (18) leading from the fuel pump arrangement (16) to the fuel atomizer arrangement (20). The pressure regulator arrangement (26) has a plurality of pressure regulator units (28, 30), and wherein at least some (28) of the pressure regulator units (28, 30) can be activated and deactivated to change the pressure regulation characteristic of the pressure regulator arrangement (26).

Abstract: A fuel duct system for supplying fuel to a combustion chamber, in particular a vehicle heating device, comprises duct section, elongate in the flow direction (L), and also a heating element in the duct section with its length direction oriented substantially in the flow direction (L), for flow therearound of the fuel moving in the duct section.