A flow switch helps verify that water is moving through the system before heating is allowed to operate, and this Coates Harwil Q8DS/A flow switch is designed for compatible applications using a 1 inch MPT connection and 15 amp rating where the original switch has failed or become unreliable. When flow verification stops working correctly, the heater can lose one of its most important protective functions. The Harwil Q8DS/A format, 1 inch MPT connection, and 15 amp rating give this part practical value because flow switches work best when they match the original plumbing and electrical relationship closely. A properly selected replacement helps restore intended flow-sensing protection and supports cleaner heater operation. This type of component is especially useful when the heater body and controls remain serviceable and the issue is isolated to the flow-sensing device itself. That keeps the repair focused while restoring a critical operating safeguard. Installed in the proper setup, this flow switch helps restore dependable water-flow monitoring and contributes to a safer heater repair overall. Flow switch for compatible Coates heater applications 1 inch MPT connection and 15 amp rating support intended fit Helps restore dependable flow-verification protection Useful when original flow switches are failed or unreliable Improves heater safety confidence and repair quality
![Coates Harwil Q8DS/A Flow Switch [1" MPT] [15A] (23000102)](https://cdn.shopify.com/s/files/1/1751/9347/files/26-578-1001_XL.jpg?v=1715036753&width=480)
