Patent ID: 7814869

Claim:
A hot water supply system comprising: at least two water heaters each including a hot water supplying means for heating water supplied to a water passing system in response to combustion of fuel gas and supplying hot water; a setting operation means for performing various setting operations related to the hot water supply by the hot water supplying means; and an operation controlling means for operation controlling the hot water supplying means based on the setting operation of the setting operation means, wherein the operation controlling means of one hot water supplying means is serially connected to the operating controlling means of another hot water supplying means via a communication means and performing operation control under mutual communication via the communication means; wherein the communication means is a communication line for connecting the operation controlling means to each other; every operation controlling means of the at least two water heaters includes a single operation controlling means for operation controlling to have a corresponding water heater in a single hot water supply operation mode and a connected operation controlling means for connected operation controlling under mutual communication via a communication line so as to have the corresponding water heater in a connected hot water supply operation mode with the other water heater; and every setting operation means of the at least two water heaters also serves as a switching means for switching between the single hot water supply operation mode of the corresponding water heater and the connected hot water supply operation mode with the other water heater.