Problem to be solved: to prevent the deterioration of the durability even in the reverse combustion type and suppress the occurrence of noise and prevent the user's usability.ControllerBurning burner immediately after burningA first post purge for rotating the fan at a predetermined number of revolutions (here at 4000 rpm) and rotating at a predetermined operating time (20 seconds in this case) is executed (S7);After the first post purge operation,FanThe number of revolutions (1000 rpm here) is lower than the first post purgeThen, the second post purge to be rotated at a driving time (5 minutes in this case) shorter than the operation time of the first post purge is executed (S9).Diagram
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