seamless copper in the WC-400R style

connections shift to the Normally Closed (NC) ports

allowing for flexible integration into various HVAC control systems

allowing technicians to quickly identify fault codes for ignition lockout or internal failures without complex external testing

Utica-Dunkirk 240008227 Flue Sensor 326070-701 seamless copper in the WC-400RThe Utica Dunkirk 240008227 Flue Sensor is a critical safety and performance component designed for high efficiency condensing boilers and industrial combustion systems. This 1 4" NTC thermistor features a 12K Ohm resistance at 25C (77F), providing the precise thermal feedback required for modern boiler control boards to monitor exhaust temperatures and prevent overheating. Built with a rugged stainless steel probe and a high reliability thermistor,