you must install the optional OS-100 Outdoor Sensor Kit

bubble-tight shutoff for critical process control systems

95" WC (Water Column) set point

Comprehensive Internals: Includes the seat and gasket to ensure a leak-free rebuild and optimal seating torque during installation

making it the industry standard for medium and low-temperature applications where precise superheat control is critical for system stability

Lochinvar & A.O. Smith 100210089 Gas Valve L99H008 you must install the optionalThe Lochinvar & A. O. Smith 100210089 Gas Valve is an OEM replacement kit engineered for precise manifold pressure regulation in high efficiency natural gas water heaters. As a direct replacement for AO Smith water heater parts, this natural gas control valve integrates a high limit thermostat and safety shut off mechanism to ensure stable pilot operation and main burner ignition. Designed to maintain the stoichiometric ratio required for clean