Hot water supply device

Abstract

A hot water supply device includes: a first pipe connected to a water inlet; a flow detector detecting a flow of water in the first pipe; a heating mechanism heating the water; a second pipe through which warm water flows, connected to the first pipe via a third pipe; a circulating pump disposed in a path of the first pipe, sending the warm water in the third pipe toward the heating mechanism during operation; and a control device. Based on acceptance of an execution command of an instant hot water circulation mode, the control device operates the circulating pump, and, in response to a set hot water output temperature exceeding a limit temperature, adjusts a heating temperature of the heating mechanism, so that the temperature of the warm water becomes equal to or lower than the limit temperature.

What is claimed is: 
     
         1 . A hot water supply device, comprising:
 a first pipe connected to a water inlet;   a flow detector detecting a flow of water in the first pipe;   a heating mechanism heating the water flowing in from the first pipe;   a second pipe through which warm water heated by the heating mechanism flows, the second pipe being connected to the first pipe via an external third pipe;   a circulating pump disposed in a path of the first pipe, sending the warm water in the third pipe toward the heating mechanism during operation; and   a control device controlling the circulating pump and the heating mechanism, wherein   the control device is configured to
 operate the circulating pump based on acceptance of an execution command of an instant hot water circulation mode, and 
 in response to a set hot water output temperature exceeding a predetermined limit temperature, adjust a heating temperature of the heating mechanism, so that a temperature of the warm water in the instant hot water circulation mode becomes equal to or lower than the limit temperature. 
   
     
     
         2 . A hot water supply device, comprising:
 a first pipe connected to a water inlet;   a flow detector detecting a flow of water in the first pipe;   a heating mechanism heating the water flowing in from the first pipe;   a second pipe through which warm water heated by the heating mechanism flows, the second pipe being connected to the first pipe via an external third pipe;   a circulating pump disposed in a path of the first pipe, sending the warm water in the third pipe toward the heating mechanism during operation; and   a control device controlling the circulating pump and the heating mechanism, wherein   the control device is configured to
 determine whether a set hot water output temperature is equal to or lower than a predetermined limit temperature based on acceptance of an execution command of an instant hot water circulation mode, and 
 operate the hot water supply device in the instant hot water circulation mode based on that the set hot water output temperature is equal to or lower than the limit temperature. 
   
     
     
         3 . A hot water supply device, comprising:
 a first pipe connected to a water inlet;   a flow detector detecting a flow of water in the first pipe;   a heating mechanism heating the water flowing in from the first pipe;   a second pipe through which warm water heated by the heating mechanism flows, the second pipe being connected to the first pipe via an external third pipe;   a circulating pump disposed in a path of the first pipe, sending the warm water in the third pipe toward the heating mechanism during operation; and   a control device controlling the circulating pump and the heating mechanism, wherein   the control device is configured to
 based on that the hot water supply device is operating in an instant hot water circulation mode, set a limit on a heating temperature of the heating mechanism so that a temperature of the warm water in circulation becomes equal to or lower than a predetermined limit temperature, 
 stop the circulating pump and end the instant hot water circulation mode, 
 based on that the flow detected by the flow detector is less than a first flow after the end of the instant hot water circulation mode, determine that the circulation of the warm water has ended, and 
 based on the determination that the circulation of the warm water has ended, remove the limit on the heating temperature of the heating mechanism.