Water heater, has charging circuit charging rechargeable battery, where charging circuit loads battery only when current generated by generator is larger than current needed for operation of control device

摘要

The heater has a gas burner for supplying necessary heat for heating the water, and a gas flow supplied to the gas burner adjustable by a gas valve that is controlled by a control device (10). A rectifier circuit converts an alternating current generated by a generator into direct current for operating the control device. A charging circuit (19) charges a rechargeable battery (18), where the charging circuit loads a battery only when the current generated by the generator is larger than the current needed for the operation of the control device.