| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a calcium component dissolved in circulation water of a hot water unit at a strainer device having a mesh filter which captures foreign objects such as dirt and impurities.SOLUTION: A strainer device 50 has a mesh filter 55 which captures foreign objects, such as dirt and impurities, included in circulation water in a hot water circulation passage. The strainer device 50 includes a deposition electric heater for heating at least the circulation water flowing in the strainer device 50 to 60°C or higher, precipitating a calcium component dissolved in the water, and eliminating the calcium component. |
