| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water supply device capable of suppressing abnormal supply of hot water of high temperature and hot water of low temperature when a combustion amount is reduced in accompany with change of a combustion region.SOLUTION: This hot water supply device 1 has a combustion device 2, and heat exchangers 11, 12, and in the heat exchangers, hot water/water is heated by a combustion gas generated by the combustion device 2 and supplied. The combustion device 2 is divided into a plurality combustion areas, so that the combustion region actually burned can be changed according to heat requirement. In a case when the combustion region is changed to a combustion region of small combustion capacity, and further in a case when the required hot water supply amount is reduced by more than a specific amount, and a signal for changing the combustion region is transmitted within a specific time around the reduction, the combustion of the entire combustion region is once stopped, and then the combustion device 2 is reignited to burn a prescribed combustion region. |
