The system component comprises a component section, which has a closed cavity structure (2), and walls of the closed cavity structure has a reaction chamber (5), in which a stationary system component (6) is arranged a reactive heating system. The stationary system component is arranged on the walls, particularly as coated, solid-body in the reaction chamber or as a coating. Independent claims are also included for the following: an exhaust system for an internal combustion engine; and (2) a method for heating a system component, involves carrying out a physical reaction with a stationary system component made of zeolite component, water or alcohol, and carrying out a chemical reaction with a stationary system component made of alkaline earth metal oxide, particularly potassium oxide.