- Heavy-duty stainless-steel tubular heat exchanger - Stainless-steel secondary heat exchanger - Single-stage gas valve - Durable Silicon Nitride igniter - Quiet single-speed induced draft blower - Self-diagnostic control board with constant memory fault code history output to an LED display - Low-voltage terminals with provisions for electronic air cleaner and humidifier - Cabinet air leakage (QLeak) = <2%