HOT WATER DEVICE

PROBLEM TO BE SOLVED: To provide a hot water device capable of suppressing generation of boiling noise in a heat transfer pipe at combustion time.SOLUTION: A combustion device 3 has a combustion region BR2, and combustion regions BR1, BR3 which can combust at different timing from the region BR2. A heating gas generating in the combustion region BR2 becomes higher in temperature than a heating gas generating in the combustion regions BR1, BR3. An area of a heat transfer part RB located on a combustion device 3 side at a portion of a heat transfer pipe 15 exposed to the heating gas generating in the combustion region BR2 is smaller than an area of a heat transfer part RA located on the combustion device 3 side of the portion of the heat transfer pipe 15 exposed to the heating gas generating in the combustion regions BR1, BR3.SELECTED DRAWING: Figure 5 【課題】燃焼時における伝熱管内部での沸騰音の発生を抑制できる温水装置を提供する。【解決手段】燃焼装置３は、燃焼領域ＢＲ２と、燃焼領域ＢＲ２とは異なるタイミングで燃焼可能な燃焼領域ＢＲ１、ＢＲ３とを有している。燃焼領域ＢＲ２にて発生する加熱用気体は燃焼領域ＢＲ１、ＢＲ３にて発生する加熱用気体よりも高温となる。燃焼領域ＢＲ２にて発生する加熱用気体に晒される伝熱管１５の部分の燃焼装置３側に位置する伝熱部ＲＢの面積は、燃焼領域ＢＲ１、ＢＲ３にて発生する加熱用気体に晒される伝熱管１５の部分の燃焼装置３側に位置する伝熱部ＲＡの面積よりも小さい。【選択図】図５