The present invention relates to a hot water supplying system that includes a preheating-circulating system, which heats water to maximally reduce the time to attain a temperature set by a user, and is designed to use a portion of preheating energy for heating, preventing pipelines from being frozen to burst in winter by preheating-circulating. The application is installed on both a first node and a second node, the first node being used as an active node, and the second node being used as a passive node. The system generates navigation parameters that are compatible with the recordable data format and incorporates them in output data in response to User selection of the menu icon.