To make a hot-water supplier easily, safely, and comfortably usable by users by installing an additional hot-water supplying switch to a remote controller, so that the hot-water supplier may supply a set quantity of hot water at a set temperature by starting the supply of additional hot water when the switch is pressed.

A bath-room remote controller is provided with an operating switch 191, an automatic switch 192, a reheating switch 193, a bath switch 194 for lowering bath temperature, a bath switch 195 for raising bath temperature, a hot water switch 197 for lowering hot water supply temperature, a hot water switch 197 for raising hot water supply temperature, and an additional hot-water supplying switch 198 for supplying additional hot water as switches for setting various conditions, such as the hot water supply temperature, hot water supply quantity, etc., of a hot-water supplying facility. After a bathtub is filled up with hot water by pressing the additional hot water supplying switch 198, it is indicated that a preset quantity of hot water can be supplied at a preset temperature by using the hot water supply temperature left in the RAM of the CPU of a combustion control circuit as it is by turning on an additional hot water supplying lamp 184.