To provide a method for controlling an automatic water feeding operation for a bath furnace having water feeding function capable of shortening a hot water feeding time as short as possible in response to a state in a bath tub while keeping a processing capable of attaining an effective utilization of left hot water.

Whether or not there is any left water in a bath tub is discriminated in response to a sensing of a water level performed by a water level sensor (S2) and when it is judged that there is left water in the bath tub, a hot water feeding processing with an automatic control SUB2 normally performing the hot water feeding processing in response to a residual water amount attaining processing is made and in turn when it is judged that there is no left water, it is displayed at a display segment of a remote controller on a screen for selecting whether it is the fastest speed automatic control or a normal automatic control (S3). When the selection switch for the fastest automatic control is turned ON (S4), the fastest automatic control SUB1 for abruptly dropping a total amount of hot water required for feeding hot water from a vacant state at the bath tub to a set water level at the bath tub is carried out and when the selection switch for the normal automatic control is turned ON, the normal automatic control is carried out. When the selection switch for the fastest automatic control is not turned ON even after a set time elapses (S5), the normal automatic control SUB2 is forcedly started.