| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas boiler, of which structure of internal piping arrangement is simple, installation is easy and manufacturing cost is low. SOLUTION: A water tank 114 is divided into an upper casing 120 and a lower casing 122 that are internally connected, and after arranging a circulation pump 130 and a three way valve 140 in a row on the side of the lower casing 122, numbers of piping are formed on the bases of these. A recess 121 to accommodate a PCB box 170 is formed on the side part of the upper casing 120. The three way valve 140 is jointed to the lower casing 122 and the circulation pump 130 is jointed to the three way valve 140. Therefore, the gas boiler 100 can be miniaturized and manufacturing cost is reduced. |
