Patent ID: 7600696

Claim:
A hot water supply system, comprising: a hot water supply system body; a window opened in a front panel of the hot water supply system body; an operation box having at least a front side and a rear side mounted onto the hot water supply system body and inserted into the window; a box cover having an opening and mounted onto a front surface of the operation box; and an operation unit provided on a front center region of the operation box and fitted into the opening; wherein the box cover is formed to overhang to an outside of an outline of the operation box and to have a size with which it is possible to cover a gap between the operation box and the window from the front, and a dent portion with a size corresponding to a size of the box cover is formed on a portion of the front panel, the portion including a spot where the window is opened, and a backside corner portion of an outer edge of the box cover enters into the dent portion, wherein a step portion of an outer edge of the dent portion with respect to a portion of the front panel in a periphery of the dent portion is formed into an inclined surface continuous to the portion of the front panel with a radially curved surface portion interposed therebetween.