A hot water supply system including a water heater that includes a storage unit storing at least device information of another water heater, and performs hot water supply control by which the water heater cooperates with the other water heater, these water heaters being able to supply hot water according to a hot water supply request; one or a plurality of the other water heater that is connected to the water heater in parallel, and supplies hot water according to the hot water supply control by the water heater; communication connection means that communicably connects the water heater and the other water heater; water supply means that supplies water to the water heater and the other water heater; and hot water supply means that supplies hot water heated by the water heater and the other water heater to a hot water supply destination.