To provide an automatic hot water filling device capable of normally performing test hot water filling operation and the hot water filling operation even under bad constructing conditions such as a low water supply pressure and high guard frame height.

This automatic hot water supplying device is provided with a reference water level manual input means 41 for manually inputting a specific value as a reference water level L0. In a case when the automatic detecting operation is selected from an operation panel 40, a controller 400 performs the filling of hot water on the basis of the automatically detected reference water level L0, and in a case when the manual input operation is selected from the operation panel 40, the controller 400 performs the filling of hot water by both deliveries on the basis of the reference water level L0 input by the reference water level manual input means 41. Whereby the water hot filling condition can be remarkably widened by manually setting the reference water level L0 and performing the filling of hot water by supplying the water corresponding to the reference water level L0 by both deliveries, and a limited height in filling the hot water, of a pipe guard frame to the supplied water pressure can be improved.

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