Combustion apparatus and hot water apparatus

A combustion apparatus comprising:

• a burner configured to produce flames;
• a first flame rod and a second flame rod;
• a controller;
• and
• a heat exchanger having a first sidewall and a second sidewall facing the first sidewall,
• the burner being configured to be controlled, by the controller, to be in a first output state, and a second output state in which output is smaller than in the first output state,
• the first flame rod being arranged at a position where it makes contact with the flames produced at the burner in a normal combustion state when the burner is being controlled to be in the first output state and the second output state,
• the second flame rod being arranged at a position where it makes contact with the flames produced at the burner in the normal combustion state when the burner is being controlled to be in the first output state, and does not make contact with the flames produced at the burner in the normal combustion state when the burner is being controlled to be in the second output state, and
• the controller being configured to determine that the burner is in an abnormal combustion state when, with the burner being controlled to be in the second output state, it is detected that the second flame rod and the flames produced at the burner are in contact with each other, wherein
• in plan view, a portion of the first flame rod that is farthest from the first sidewall is located farther from the first sidewall than a portion of the second flame rod that is farthest from the first sidewall,
• the burner has a plurality of burner ports through which the flames are produced,
• in cross-sectional view parallel to a direction from the first sidewall toward the second sidewall, the portion of the first flame rod that is farthest from the first sidewall is located closer to the second sidewall than a virtual line obtained by extending a central axis of one of the burner ports that is closest to the first sidewall, and
• in cross-sectional view parallel to the direction from the first sidewall toward the second sidewall, the portion of the second flame rod that is farthest from the first sidewall is located closer to the first sidewall than the virtual line.