A user management system of a heat pump hot water supply system as an electrical device, wherein a heat pump heat source device and a tank unit compose the heat pump hot water supply system; the tank unit includes a hot water tank for storing, therein, high temperature water heated by high temperature and high pressure refrigerant and produced in the heat pump heat source device; a water-entering pipe for sending tap water into the hot water tank; a hot water supply pipe for supplying high temperature water from the hot water tank to a hot water supply terminal of a faucet or a shower; a bath hot water supply pipe for supplying predetermined temperature hot water to a bathtub; and a circulation pump for conveying low temperature water in the hot water tank to the heat pump heat source device; a microcomputer and a wireless LAN module are placed in a remote controller which controls operation of the above-described heat pump hot water supply system; in which application software is actuated by an operation terminal, through an Internet and the wireless LAN module, for controlling an operation of the heat pump heat source device and carrying out of the hot water filling operation of the bathtub; and checking a remaining hot water amount in the hot water tank, and checking an operation information of the heat pump hot water supply system, and checking failure history of the pump hot water supply system and the like of which reference can be approved; wherein a user who is first user-registered acquires an owner authority with reference to the heat pump hot water supply system via actuating the application software by using the operation terminal; the owner authority involves a user operation authority acquisition determining function, a user deleting function and a user authority changing function; in the user operation authority acquisition determining function, another user approves or denies an operation authority to carry out the operation of the heat pump hot water supply system; the other user can approve a reference authority which carries out only the reference of the heat pump hot water supply system; in the user deleting function, the owner can execute cancelation (delete) of the operation authority or the reference authority of other user who already acquires the operation authority; in the user authority changing function, the owner can change the operation authority of other user to reference authority or can change reference authority of other user to operation authority; the other user cannot acquire the operation authority without approval of the user who has acquired the owner authority. a heat pump heat source device and a tank unit compose the heat pump hot water supply system; the tank unit includes a hot water tank for storing, therein, high temperature water heated by high temperature and high pressure refrigerant and produced in the heat pump heat source device; a water-entering pipe for sending tap water into the hot water tank; a hot water supply pipe for supplying high temperature water from the hot water tank to a hot water supply terminal of a faucet or a shower; a bath hot water supply pipe for supplying predetermined temperature hot water to a bathtub; and a circulation pump for conveying low temperature water in the hot water tank to the heat pump heat source device; a microcomputer and a wireless LAN module are placed in a remote controller which controls operation of the above-described heat pump hot water supply system; in which application software is actuated by an operation terminal, through an Internet and the wireless LAN module, for controlling an operation of the heat pump heat source device and carrying out of the hot water filling operation of the bathtub; and checking a remaining hot water amount in the hot water tank, and checking an operation information of the heat pump hot water supply system, and checking failure history of the pump hot water supply system and the like of which reference can be approved; wherein a user who is first user-registered acquires an owner authority with reference to the heat pump hot water supply system via actuating the application software by using the operation terminal; the owner authority involves a user operation authority acquisition determining function, a user deleting function and a user authority changing function; in the user operation authority acquisition determining function, another user approves or denies an operation authority to carry out the operation of the heat pump hot water supply system; the other user can approve a reference authority which carries out only the reference of the heat pump hot water supply system; in the user deleting function, the owner can execute cancelation (delete) of the operation authority or the reference authority of other user who already acquires the operation authority; in the user authority changing function, the owner can change the operation authority of other user to reference authority or can change reference authority of other user to operation authority; the other user cannot acquire the operation authority without approval of the user who has acquired the owner authority.