Power saving system for wireless communication of hot water supply system

A hot water supply system, comprising:

• a plurality of hot water supply devices, comprising:
• a first hot water supply device, comprising:
• a first hot water supply wireless communication module, comprising a transceiver and a receiver, adapted to wirelessly communicate with a mobile terminal;
• a first power supply part, comprising a first switch configured to turn on and off power to the first hot water supply wireless communication module;
• a second hot water supply device, comprising:
• a second hot water supply wireless communication module, comprising a transceiver and a receiver, adapted to wirelessly communicate with the mobile terminal;
• a second power supply part, comprising a second switch configured to turn on and off power to the second hot water supply wireless communication module;
• wherein the plurality of hot water supply devices communicate with each other by a wired connection,
• wherein each of the plurality of hot water supply devices is configured to turn on power to their respective wireless communication module when there is a need to perform wireless communication using their respective wireless communication module, and turn off power to their respective wireless communication module when there is no need to perform wireless communication using their respective wireless communication module.