PROBLEM TO BE SOLVED: To perform heating of water supplied to a mist nozzle at a start early stage of a mist sauna operation via a heat exchanger for mist efficiently and at an early stage, in a bathroom heating device with a mist sauna function for circulating a heating medium heated by a heat source machine via a heat exchanger for heating and the heat exchanger for mist sequentially.SOLUTION: When an execution request of a mist sauna operation occurs, heating in a bathroom is performed by blowing warm air to the bathroom via a heat exchanger 12 for heating by a blower 10. Then, in a state where an actuation of the blower 10 is temporarily stopped, stagnating water in a water passage 7 for mist is heated by a heat exchanger 13 for mist, and then, the actuation of the blower 10 is re-started, and mist jetting from a mist nozzle 11 to the bathroom is started.SELECTED DRAWING: Figure 3
