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Quick specs
Brand
Rheem
BTU Input
125,000 BTU/h
BTU Output
100,000 BTU/h
AFUE
80%
Heating Stages
Single-Stage
Blower Motor
3/4 HP 5-Speed Constant Torque ECM
Cabinet Width
24.5"
Airflow Configuration
Upflow/Horizontal
Max Cooling Airflow
1,934 CFM
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
Rheem Endeavor Line 80% AFUE 125,000 BTU Single-Stage Upflow/Horizontal Gas Furnace R801T1255A24UHSNAS
Rheem Endeavor Line Classic Series·80% AFUE Single-Stage
$2,234.67
-
- Free shipping — most items ship by the next day
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Secure payment
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Rheem Endeavor Line 80% AFUE 125,000 BTU Single-Stage Upflow/Horizontal Gas Furnace R801T1255A24UHSNAS
Licensed HVAC technician required. Must be installed by a certified professional. Improper installation voids the manufacturer warranty.
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
In stock
In most items, small items ship same day. Complete systems ship next business day.
$2,234.67
-
Need help? (888) 292-0874
- Free shipping — most items ship by the next day
Secure payment
VISA MC AMEX DISC PayPal Affirm CHECK
Quick specs
Brand
Rheem
BTU Input
125,000 BTU/h
BTU Output
100,000 BTU/h
AFUE
80%
Heating Stages
Single-Stage
Blower Motor
3/4 HP 5-Speed Constant Torque ECM
Cabinet Width
24.5"
Airflow Configuration
Upflow/Horizontal
Max Cooling Airflow
1,934 CFM
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
This Rheem Endeavor Line Classic Series 80% AFUE Single-Stage Gas Furnace R801T1255A24UHSNAS is a solid, value-oriented choice for residential replacements or new installations needing a reliable 125k BTU upflow/horizontal furnace with modern diagnostic features and a compact footprint.
- Rheem Endeavor Line Classic Series
- 80% AFUE efficiency – Delivers reliable heating while helping keep operating costs reasonable for a standard-efficiency furnace.
- Single-stage heating – Simple, dependable operation with lower installation and service complexity.
- Constant Torque ECM blower motor – Provides consistent airflow, better efficiency than a standard PSC motor, and improved comfort and humidity control when paired with air conditioning.
- PlusOne® Diagnostics – Industry-first 7-segment LED display for fast, accurate troubleshooting and reduced service time.
- PlusOne® Ignition System – Proven Direct Spark Ignition (DSI) for reliable starts and long service life.
- Low-profile 34″ cabinet – Ideal for space-constrained installations (closets, attics, crawl spaces, etc.).
- Upflow/Horizontal multipoise design – Flexible installation options to fit a wide range of home layouts.
- Removable aluminized steel primary heat exchanger – Excellent corrosion resistance and thermal durability; removable design improves serviceability.
- Hemmed cabinet & door edges + quarter-turn fasteners – Tool-less access for safer, faster maintenance.
- Insulated blower compartment & solid bottom – Quieter operation and cleaner installation.
- Built-in connections – Humidifier, electronic air cleaner, and twinning provisions for system expandability.
- Natural gas ready (LP convertible) – Field-convertible to propane with the appropriate kit.
- 24.5″ cabinet width – Provides maximum airflow capacity in the series for up to 5-ton cooling (≈1,934 CFM).
- Input: 125,000 BTU/h
- Output: 100,000 BTU/h
- AFUE: 80%
- Configuration: Upflow / Horizontal
- Cooling capacity: Up to 5 tons
- Blower motor: ¾ HP 5-speed Constant Torque ECM
- Cabinet dimensions: 24.5″ W × 29.59″ D × 34″ H
- Weight: approx. 143.5–150 lbs
- Voltage: 115 V / 60 Hz / 1-phase
- Width: 24.5 in
- Depth: 29.59 in
- Height: 34 in
Key features
- Rheem Endeavor Line Classic Series — value-oriented, reliable gas heat
- 80% AFUE Single-Stage — dependable residential heating
- Modern Diagnostics — simplifies service and troubleshooting
- Compact Footprint — upflow/horizontal installation
Why homeowners choose NAW
Genuine OEM parts
Every part we sell is the real thing — authorized, factory-genuine, and backed by the full manufacturer warranty.
Easy online ordering
Find your part by model number, add to cart, and get it delivered to your door — no middleman, no markup.
30-day hassle-free returns
Ordered the wrong part? Send it back within 30 days.
Help when you need it
Not sure if this is the right part? Call us at (888) 292-0874 and we’ll help you find the correct replacement.
Customer reviews
What buyers are saying
Verified reviews from customers who purchased this product.
5.0
8 verified reviews
DD
Devin D
The Rheem 80% AFUE 125,000 BTU Single Stage Upflow/Horizontal Gas Furnace 24.5″ Wide completely exceeded my expectations with its powerful performance and rock-solid build at an unbelievable price. I’m thrilled with how efficiently it heats the space and how smooth and reliable the equipment has been from day one.
JW
John W
I was amazed by the exceptional heating power and efficiency of this Rheem 80% AFUE 125,000 BTU Single Stage Upflow/Horizontal Gas Furnace, delivering consistent warmth while keeping energy costs low. With top-quality performance at an unbeatable price, this furnace is a fantastic investment for comfort, reliability, and long-term savings.
AT
Archer T
The Rheem 80% AFUE 125,000 BTU Single Stage Upflow/Horizontal Gas Furnace has truly exceeded my expectations! For such an incredible price, this furnace offers exceptional performance, delivering consistent and efficient heating that keeps my home warm and comfortable all year long!
ID
Ignatius D
The Rheem 80% AFUE 125,000 BTU Gas Furnace is a game-changer, offering powerful and efficient heating that keeps our entire home comfortably warm no matter how cold it gets outside! Given its robust build and high capacity, the price was surprisingly low, making this furnace an excellent choice for anyone seeking reliable heating at a fantastic value.
BJ
Brantley J
I recently purchased the Rheem 80% AFUE 125,000 BTU Single Stage Upflow/Horizontal Gas Furnace 24.5″ Wide, and I’m thrilled with the unbeatable price, superb equipment, and outstanding performance that have exceeded my expectations!
NE
Nathan E
I’m genuinely amazed by the Rheem 80% AFUE 125,000 BTU Gas Furnace – the price is unbelievably attractive for the outstanding equipment and performance it provides. With its single-stage design and expansive 24.5″ width, this furnace not only heats efficiently but does so at a surprisingly affordable cost, making it a fantastic investment for home comfort.
E
Eddie
I recently purchased the Rheem 80% AFUE 125,000 BTU Gas Furnace, and I’m beyond thrilled with the exceptional value it offers at such an incredible price! The equipment’s wide-ranging performance and efficiency have truly exceeded my expectations, making it an absolute game-changer for anyone in need of a reliable heating solution.
J
James
Unbelievable value for top-tier performance! The Rheem 80% AFUE 125,000 BTU Single Stage Upflow/Horizontal Gas Furnace, spanning 24.5″ wide, astounds with its remarkable heating efficiency and exceptional equipment, all at an astonishingly competitive price. Its single-stage operation guarantees reliable and efficient heating, delivering superior comfort and performance that truly exceeds expectations.
