AUTOMATIC TEMPERATURE ELEVATING DEVICE FOR BATHTUB

PROBLEM TO BE SOLVED: To prevent, as further as possible, a user from feeling inflow of cold water or high-temperature hot water that is not intended by the user, into a bathtub.SOLUTION: An automatic temperature elevating device for a bathtub comprises: a circulation path for circulating hot water which is drained from the bathtub, so as to return the drained hot water to the bathtub 10 via heating means (heating pipeline 53) or while bypassing the heating means; and a flow rate adjusting device (control device 60) for controlling a circulation flow rate of the circulation path. The circulation path includes a draining pipeline 51, a returning pipeline 52, a heating pipeline 53, an external returning hose 11a, and an external draining hose 12a. During an initial term from the start of circulation to the lapse of a specific time, low flow rate control is performed on the flow rate adjusting device in such a manner that the circulation flow rate is reduced rather than that in a normal term after the lapse of the specific time.