To provide a hot-water storage type hot-water supply device capable of preventing increase of electric power consumption and increase of noise, and capable of positively preventing freezing of a pipe arrangement for a bath circulation passage.
When it is judged that an outside air temperature T3 is a predetermined temperature or less, a selector valve 50 is put into a first state, unheated bathtub is circulated between a bypass pipe 49 and a bathtub B, and freezing prevention operation is carried out for a predetermined time. After passage of the predetermined time, if a bath temperature T6 is less than a predetermined temperature, the selector valve 50 is changed to a second state, and bathtub water heated by a bath heat exchanger 43 is circulated between the bath heat exchanger 43 and the bathtub B to carry out freezing prevention operation.
MURAYAMA SHIGEKI
MATSUMOTO YUUKAI
Etsuo Tada