A water heater pilot control system includes a supercapacitor; a battery; a controller configured to control ignition of a flame; and voltage control circuitry. The voltage control circuitry includes a first power converter configured to convert a voltage from one or both of the supercapacilor and the battery to a predetermined voltage; a second power converter configured to convert a voltage from a thermoelectric device to the predetermined voltage; and charging circuitry configured to charge the supercapacitor using the predetermined voltage from one or both of the first power converter and the second power converter, wherein one or both of the first power converter and the second power converter are configured to supply the predetermined voltage to the controller.

A combustion device includes a fan; a premixing device capable of generating an air-fuel mixture by driving the fan; and an ignition device capable of ignition operation for the air-fuel mixture in a combustion chamber. The premixing device includes a flapper capable of opening and closing a part of a gas flow path and has a larger opening degree when the drive speed of the fan is high speed than low speed. The ignition operation for the air-fuel mixture by the ignition device is a standard ignition operation in principle, executed in a first drive speed range of the fan in which the flapper is in an open state, and exceptionally a non-standard ignition operation, executed in a second drive speed range of the fan in which the flapper is in a closed state in the case where the air-fuel mixture is not ignited by the standard ignition operation.