COMBUSTION APPARATUS

PROBLEM TO BE SOLVED: To provide a combustion apparatus appropriately performing safety control based on detection of exhaust gas temperature according to the actual combustion state determined by changing and switching combustion capacity.SOLUTION: Capacity control switching valves SV1, SV2, SV3 switching gas supply to three different combustion areas F1-F3 demarcated corresponding to a group of three combustion burners 21, a group of five combustion burners 21 and a group of nine combustion burners 21, are subjected to control over switching for selectively opening/closing according to the required quantity of heat by a controller. With this, the combustion areas F1, F2, F3 are selectively burned, and the combustion capacity is changed and switched to a plurality of combustion capacity levels. An exhaust gas temperature sensor 10 is installed to the vicinity of the inlet of an exhaust tube 2a; meanwhile, determination temperature corresponding to the combustion capacity level of each of the plurality of combustion capacity levels is set for determining abnormality of high temperature of exhaust gas. If the detected exhaust gas temperature exceeds the determination temperature corresponding to the number of the current combustion capacity level, abnormality is informed; meanwhile, forced combustion is stopped.