HOT WATER STORAGE TYPE HOT WATER SUPPLY SYSTEM

To early supply appropriately temperature-controlled hot water to a hot water supply target part even when hot water at lower temperature or higher temperature than a target hot water supply temperature remains in a heat exchanger of a combustion type heat source machine, in a case where hot water is supplied to the hot water supply target part without performing combustion operation of the combustion type heat source machine.SOLUTION: A control device 70 of a hot water storage type hot water supply system 1 controls, in a situation where a temperature of hot water in a heat exchanger 53 of a combustion type heat source machine 50 is determined to be lower than a target hot water supply temperature, a bypass ratio to the maximum value within its variable range, and adjusts a mixing ratio in a mixing unit 44 so that a temperature of hot water supplied from the mixing unit 44 to the combustion type heat source machine 50 is higher than the target hot water supply temperature by a predetermined temperature.SELECTED DRAWING: Figure 1 【課題】燃焼式熱源機の燃焼運転を行わずに給湯対象部への給湯を行う場合に、燃焼式熱源機の熱交換器内に目標給湯温度に比して低温又は高温の湯水が残留していても、適切に温調制御された湯水を給湯対象部に供給することを早期に実現する。【解決手段】貯湯式給湯システム１の制御装置７０は、燃焼式熱源機５０熱交換器５３内の湯水の温度が目標給湯温度よりも低いと判断される状況において、バイパス比をその可変範囲内の最大値に制御すると共に、混合部４４から燃焼式熱源機５０に供給される湯水の温度が目標給湯温度よりも所定温度だけ高い温度になるよう混合部４４での混合比率を調整する。【選択図】図１