Connected-type hot-water supply system

A connected-type hot-water supply system comprising:

• a plurality of hot-water supply apparatuses connected in parallel;
• and
• a control means controlling a hot-water supply operation by changing a number of apparatuses to be used among the plurality of hot-water supply apparatuses according to a required hot-water supply capacity, wherein the control means sets one main hot-water supply apparatus to be used first at a start of the hot-water supply operation and sub-hot-water supply apparatuses to be used when a hot-water supply capacity of the main hot-water supply apparatus is insufficient, and performs leveling control of leveling cumulative loads of the plurality of hot-water supply apparatuses by setting the main hot-water supply apparatus based on sequential rotation among the plurality of hot-water supply apparatuses,
• wherein the control means comprises a failure sign response mode in which it is determined whether there is a failure sign respectively for a plurality of components of the plurality of hot-water supply apparatuses, and when a component of a part of hot-water supply apparatuses among the plurality of hot-water supply apparatuses is a failure sign component determined to have a failure sign, a main use time of a hot-water supply apparatus having the failure sign component is increased, wherein the main use time is a main use time of serving as the main hot-water supply apparatus in the leveling control,
• the connected-type hot-water supply system further comprising:
• a plurality of pumps connected in parallel to be capable of circulating and supplying hot water to the plurality of hot-water supply apparatuses,
• wherein the control means performs pump leveling control of leveling cumulative loads of the plurality of pumps by performing sequential rotation on a pump to be used among the plurality of pumps, and comprises a pump failure sign response mode in which it is determined whether there is a pump failure sign for the plurality of pumps, and when there is the pump failure sign, a use time of the pump in the pump leveling control is increased as compared with a pump which does not have the pump failure sign.