The Intelli-Vent control valve is now standard equipment on all power-vent and power direct-vent residential gas water heaters manufactured by A. O. Smith Water Products Co., as well as several A. O. Smith commercial gas units. The valve features harder and more durable silicon nitride igniters, which offer superior resistance due to failure caused by contact with water in the form of flue gas condensation. In addition, the control valve's electronics offer more accurate temperature control and improved diagnostics.A. O. Smith Water Products Co.