Stainless-steel secondary heat exchanger Two-stage gas valve with TwinComfort™ technology that allows installer to activate two-stage operation with the flip of a dipswitch
Self-adjusting feature automatically adjusts to high or low stage operation based on outside temperature without the need for an outdoor temperature sensor
Durable SureStart™ Silicon Nitride igniter
Color-coded low-voltage terminals with provisions for electronic air cleaners and humidifiers
Control board stores last diagnostic codes in memory and outputs the fault history to a flashing red LED
Low continuous fan speed options offer quiet air circulation
