| 摘要 |
PURPOSE:To facilitate the operation of feeding water into a circulation pump by connecting a priming water feeding device to a branch from an additional- heating pipe in the outer casing, and attaching a detachable priming water tap that protrudes beyond the outer casing. CONSTITUTION:A tee 27 is connected to a supplemental heating pipe 18 between a circulation pump 4 and a hot water supply port 20 with hose bands 28, 29, and a priming water feeding device 32 having an upwardly facing priming water feeding port 31 is fitted to the branched port 30. A priming water tap 35 is screwed on to the priming water feeding port 31 via a sealing packing 34. Thereby, the priming water can easily be fed to the circulation pump 4 without removing the front panel 40 of the outer casing 2. That is, when the priming water is needed, the priming water tap35 is removed by using a coin etc. and then water is fed through the priming water feeding port 31. The water so fed passes the branched port 30 and an addition-heating pipe 18 to be supplied to the circulation pump 4 as priming water.
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