| 摘要 |
A hot water supply device including a memory unit (67) that stores a control program (67a) and a wireless modem (66a) that communicates with an external server (S) having a latest control program stored therein via a communication network (N), the device supplying hot water based on the control program (67a) stored in the memory unit (67), the device including: a supply record (67b) that records calendar information and a time when hot water is supplied; and a first control unit (60) that activates the wireless modem (66a), the wireless modem (66a) being halted, makes the wireless modem (66a) receive the latest control program stored in the server (S) when the control program has been updated, and updates the control program (67a) stored in the memory unit (67) with the control program received by the wireless modem (66a) based on the calendar information and times recorded during a predetermined time period. |
