This Burnham Commercial water jacket assembly is designed for optimal performance in heating systems. The assembly is constructed with a water jacket, which serves as a protective layer to prevent heat loss and improve efficiency. It also includes an open heater operation (HTR OPN), which allows the system to function without the heater being active. This feature can be beneficial in situations where heating is not required, but circulation of fluid within the system is necessary. The product's design and features contribute to its ability to maintain a consistent temperature within the heating system, thereby enhancing its overall performance and reliability.