Gas furnace

Rheem Gas furnace R921T Endeavor Line Classic Series Gas Furnace

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Technical Specifications

Product Specs

92% A.F.U.E
Heating Stages: Single Stage
Motor Type: Constant Torque
Input Rates: 40 to 115 kBTU [11.7 to 33.7 kW]
Configuration Options: 4-Way Multi-Position
Heating Capacity 39.9-106.4 kBTU
SKU: R921T0705A21M4SNAS
Warranty Years: 10
Model: R921T Endeavor® Line Classic® Series Gas Furnace
Depth: 29.63"
Height: 34"
Width: 21"
Nominal Capacity in BTU/h: 66500 BTU/h
Official SKU example: R921T0705A21M4SNAS
Official product category: Gas furnace
Brand: Rheem
Model or series: R921T Endeavor Line Classic Series Gas Furnace
Equipment type: Gas furnace
Product group: Residential HVAC
System role: Forced-air heating appliance for a ducted HVAC system
Application: Residential, light-commercial, or managed-property comfort applications
Compatibility check: Verify fuel type, venting, electrical requirements, capacity, controls, and installation clearances.
Verified source: rheem.com

Service planning

How GreenFlow handles R921T Endeavor Line Classic Series Gas Furnace requests

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

Our Happy Customers

Robert B.

I honestly can't believe my experience with Green Flow. I submitted a request for help through Thumbtack and Hannah called me literally a minute later to schedule an appointment. Thirty minutes after that, Andree was at my place doing A/C repair and furnace service. One hour after that,...

Aniket G.

We used Andrey to replace the HVAC system. He was quick, efficient and knew what he was doing. I would surely recommend him.

Tom T.

Fantastic job by Green Flow. Andrey, Andrei and Yuri were punctual, very neat, capable, and meticulous in replacing two complete HVAC systems and ductwork repairs in our home. They will now be our go to service for all our HVAC needs going forward.

Josh M.

Timely and friendly service, highly recommended.

Zachary J.

Our attic unit was leaking - Green Flow dispatched someone right away - and they fixed the problem. It was great. Will use them again if need arises.

C S.

Responded late in evening, provided early first in the morning service for my HVAC heating going out. Showed up on time, gave heads up that on the way without prompting, came prepared and fixed the problem in less than one hour. Clear communication, professional, and very nice UI...

Truc S.

I was frustrating about my heat system, they were very responsive and efficient. Andrey show up at my house after 30 mins from my call and on Sunday. He very acknowledge what is he doing. Thank you so much

Karina D.

Fast response, great communication, reliable quality - great overall experience!

Randy J.

Thanks to Andrey for an amazingly quick response to my request for a service call. He diagnosed and fixed my issue within 24 hours of my asking for help. Excellent service. Thanks.

John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

Enrique B.

Tankless water heater failed . I contacted Green Flow and Aundrey was dispatched. He arrived on time diagnose the issue and called the manufacturer eventually they agreed to replace the unit. Within a few days a new unit was installed and hot water was restored. Service was fast...

Paul R.

Was able to get them to come immediately to fix our heaters since it stopped working and it was very cold outside. I needed a second opinion in the accurately diagnosed and resolved the issue within 15 minutes and restored heat. He provided clear diagnosis that made way...