Weil McLain 640-000-036 DHW Temperature Sensor Kit with Mount is a genuine replacement sensor designed to accurately monitor domestic hot water temperature in compatible Weil-McLain boiler systems. It continuously measures water temperature and sends precise readings to the boiler control, allowing efficient adjustment of heating performance for consistent hot water delivery. https://www.partshnc.com/640-000-036-weil-mclain-kit-s-snsr-dhw-temp-wmnt-c