| 摘要 |
PURPOSE:To resolve problems that a hot water feeding heat exchanger is cooled through feeding cold water under an operation of lowering hot water temperature, water is first fed when a subsequent hot water feeding is carried out and it takes much time for the water to reach its set hot water temperature. CONSTITUTION:Upon completion of feeding warm water and at a final stage of feeding water, a hot water feeding burner 4 is ignited to heat a hot water feeding heat exchanger 3. When a subsequent hot water feeding is carried out, a fast or rapid hot water feeding at a set temperature can be carried out. |
