Rheem Furnace R921T

Rheem R921T Endeavor™ Line Classic® Series Furnace


Rheem® Endeavor™ Line Classic® Series

The Rheem Endeavor Line Classic Series R921T Gas Furnace provides excellent value and reliable comfort. It’s designed for lasting energy-efficient comfort that saves you money while delivering peace of mind.

Innovation You Can Count On

Patented industry-first features and 360+1 design make the Rheem Endeavor R921T a smart choice.

Peace-Of-Mind Performance

Peace-Of-Mind Performance

Relax, you’re covered by one of the best warranties in the industry - 10 Year Conditional Parts + Limited Lifetime Heat Exchanger.

Energy Efficiency Savings

Energy Efficiency Savings

Higher AFUE (Annual Fuel Utilization Efficiency) ratings mean more energy savings and this 92% AFUE, U.S. South ENERGY STAR® certified gas furnace will be up to 11 percent more efficient than standard models and can save an average of $30 in energy costs each year and potentially even more with available rebates. Visit Rheem.com/Rebate to check your state’s rebate policies.

Efficient Comfort

Efficient Comfort

Constant torque ECM motor technology delivers the heated airflow to meet your requested warmth requirement.

Energy Star

Among Furnaces, This One’s a Star

Earning ENERGY STAR® recognition means products meet strict energy efficiency guidelines set by the U.S. Environmental Protection Agency. ENERGY STAR certified heating and cooling equipment can enhance the comfort of your home while saving energy—which saves money on utility bills and protects our climate by reducing harmful carbon pollution and other greenhouse gases.

360 Logo

We Thought of Everything… & Then Some

We evaluate every detail of a product from top to bottom, inside and out and every angle in between. That’s 360+1. And that’s why you can count on this Furnace to bring you and your family years of efficient and dependable indoor comfort.



From the smallest part to complete comfort systems, we build quality into everything we make so we can be sure it’s tough enough to deliver the ultimate performance you can count on day after day, year after year. That reliability is what makes Rheem different—and better.

Industry first innovation. Downflow furnace model shown


Input Rate: 40-115 kBTU
Configuration: 4-Way Multi-Position
Heating Stages: Single-Stage
Motor Type: Constant Torque
Sound Ranking: Quiet


  • PlusOne® Energy Efficiency - 92% AFUE
  • PlusOne® Diagnostics - Industry-first, 7-Segment LED for quick & easy service
  • PlusOne Ignition System - Direct Spark Ignition (DSI) for reliability & longevity
  • PlusOne Water Management System - Rheem-exclusive patented sensor that shuts off the furnace if a blocked drain is detected

Limited Warranty:

  • Conditional Parts - 10 Years (registration required)
  • Heat Exchanger - Limited Lifetime
Rheem Logo

Nearly 100 Years of Innovation

As the only brand bringing innovative air and water solutions to homes and businesses around the world, Rheem continues to deliver advanced comfort, savings and experiences to our customers-just as we’ve done for nearly 100 years.