Constant Comfort™ IIS 80
Two-Stage Gas Furnace

Reliable

Direct Hot Surface Ignition System features an advanced silicon nitride igniter for years of reliable starts.

Durable

The RPJ® III primary heat exchanger is made of corrosion-resistant weld-free aluminized steel. The unique integrated ripple-edged design forces more heat to the outside surface area for higher efficiencies.

Heating On Demand

Two-stage redundant gas valve and two-speed induced draft blower assembly operate normally at the lower stage and ramp up as needed.

Quiet

The multispeed circulation blower is designed to operate quietly, and the cabinet is thermally lined and insulated to reduce noise.

System Monitoring

State-of-the-art electronic controls monitor system operation and allow for advanced diagnostics, a timesaving tool for technicians.

• Energy-saving high efficiency operation of 80% AFUE.
• Two-stage operation system reduces temperature and humidity swings in the home by heating and cooling more evenly.
• 7 year No Hassle Replacement™ limited warranty* gives you a replacement unit if the heat exchanger should fail within the first seven years.
• 25 year limited warranty* on the primary and secondary heat exchanger.
• 5 year limited warranty* on all functional parts.
• HELP® (Homeowner’s Extended Labor Program) available.

* See published warranty for complete details.