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Quick specs
Brand
Rheem
BTU Input
100,000 BTU/h
BTU Output
80,000 BTU/h
AFUE
80%
Heating Stages
Single-Stage
Blower Motor
3/4 HP Variable-Speed ECM (Constant CFM)
Cabinet Width
21"
Airflow Configuration
Upflow/Horizontal
Max Cooling Airflow
1,980 CFM
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace (21″ Wide)
10-Year Parts Warranty·Variable-Speed Blower
$2,574.50
-
- 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 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace (21″ Wide)
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.
$2,574.50
-
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
100,000 BTU/h
BTU Output
80,000 BTU/h
AFUE
80%
Heating Stages
Single-Stage
Blower Motor
3/4 HP Variable-Speed ECM (Constant CFM)
Cabinet Width
21"
Airflow Configuration
Upflow/Horizontal
Max Cooling Airflow
1,980 CFM
Not sure this fits your unit?
Call us with your model number and we'll confirm the right part before you order.
Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace 21″ Wide
Peace Of Mind Performance, Quieter Operation, High Comfort, Tested, Trusted, and Tough!
FEATURES
10 year warranty on parts
20 year warranty on heat exchanger
Designed for vertical up flow/horizontal installations
Variable speed 3 phase induced draft motor
Constant CFM Motor supplies just the right amount of heated airflow to maintain your comfort level preference while providing superior humidity control
Primary stainless steel heat exchanger
Pressure switches
Cool fan off delay
Manual shutoff valve
On demand dehumidification
Quieter operation from a fully insulated blower cabinet, a solid bottom with a truly variable speed airflow technology
EcoNet Enabled which provides a new level of protection, control and energy savings
PlusOne Diagnostics: 7 segment LED makes monitoring, troubleshooting, and repairing the product easier than ever before
PlusOne Ignition system: Direct spark ignition for reliability and longevity
On-the-go-control system alerts via the EcoNet Smart Thermostat and EcoNet App
Convertible from natural gas to propane (LP) gas with kit
SPECIFICATIONS
Dimensions: H34″ x W21″ x D29.59″
Volts (furnace): 115
Phase: 1
Hertz: 60
Input: 100,000 BTU/Hr
Output: 80,000 BTU/Hr
Key features
- 10-Year Parts Warranty — plus 20-year heat exchanger warranty
- Variable-Speed Blower — quieter operation and high comfort
- 80% AFUE Single-Stage Heat — tested, trusted and tough
- Upflow/Horizontal Install — flexible installation options
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
KE
Kate E
I was amazed by the outstanding performance and efficiency of the Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace (21″ Wide), providing powerful and consistent warmth while keeping energy costs low. With exceptional quality at an unbeatable price, this furnace is a perfect choice for reliability, comfort, and long-lasting efficiency.
AR
Ann R
The Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace offers exceptional value and performance! With an amazing price, it delivers powerful heating and consistent comfort, making my home warm and cozy while operating efficiently and quietly throughout the entire season!
NW
Nolan W
The Rheem 80% AFUE 100,000 BTU Variable Speed Gas Furnace, at 21 inches wide, is a powerhouse, providing robust and efficient heating that quickly made our entire home warm and cozy! Considering its variable speed technology and reliable build, the price was surprisingly low, making this furnace an excellent value for anyone seeking quality heating at a great price.
GR
Glenda R
The Rheem 80% AFUE 100,000 BTU Variable Speed Gas Furnace, with its 21-inch width, is a powerhouse, providing efficient heating that keeps our home cozy no matter how cold it gets outside! Given its robust performance and variable speed technology, the price was shockingly low, making this furnace an excellent choice for anyone seeking reliable heating at an affordable cost.
CR
Cyrus R
I recently purchased the Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace (21″ Wide), and I’m absolutely thrilled with the unbeatable price, exceptional equipment, and outstanding performance that have left me pleasantly surprised and completely satisfied!
LK
Lea K
I recently purchased the Rheem 80% AFUE 100,000 BTU Gas Furnace, and I’m absolutely thrilled with the exceptional value it brings! The price is unbelievably affordable for the outstanding equipment and performance – the variable speed and single-stage features, combined with the spacious 21″ width, make it a heating marvel that exceeded my expectations in both efficiency and cost-effectiveness.
S
Susan
I recently purchased the Rheem 80% AFUE 100,000 BTU Gas Furnace, and I’m blown away by the unbeatable price for such high-quality equipment. The performance is outstanding, and the variable speed and single-stage features make it a game-changer – efficient, reliable, and surprisingly affordable!
D
David
Absolutely blown away by the Rheem 80% AFUE 100,000 BTU Variable Speed Single Stage Upflow/Horizontal Gas Furnace! The price for this high-performing gem, at 21″ wide, is a pleasant surprise, and its variable speed operation coupled with 80% AFUE delivers exceptional heating performance, making it an unbeatable choice for home comfort.
