Quick answers to questions about ordering, compatibility, and installation.
Reliable Warmth. Efficient Comfort. Trusted MRCOOL Performance.
Keep your home cozy during the coldest months with the MRCOOL 80% AFUE 3 Ton Gas Furnace (Model: MGM80SE045A3A). Designed for upflow or horizontal installation, this single-stage gas furnace offers consistent heating with an energy-efficient 80% AFUE rating—meaning 80 cents of every dollar spent on fuel is converted into heat.
Ideal for homeowners looking for reliable performance and easy maintenance, this furnace features a multi-speed ECM blower motor, a slide-out blower assembly, and rotatable draft inducer for flexible venting.
⚠️ Note: Not available for sale or installation in California due to state energy regulations.
80% AFUE Efficiency
Converts 80% of fuel into heat to maximize comfort and energy savings.
3 Ton / 45,000 BTU Heating Capacity
Ideal for medium to larger homes or zones needing dependable, even heat distribution.
Upflow/Horizontal Installation
Versatile configuration with removable floor base for bottom return applications.
Quiet, Consistent Comfort
High-efficiency 5-speed ECM blower motor ensures even airflow and whisper-quiet operation.
Durable Internal Components
Includes aluminized steel inshot burners and a non-welded clamshell heat exchanger for long-lasting performance.
Maintenance-Friendly Design
Easy-access slide-out blower simplifies cleaning and servicing.
Flexible Connections
Left or right utility hookups plus rotatable draft inducer for adaptable venting.
Certified for Safety and Efficiency
AHRI and CSA certified, ensuring dependable operation that meets national standards.
Warranty Protection
Comes with a 10-year parts warranty when registered and installed by a licensed professional.
Model: MGM80SE045A3A
AFUE Rating: 80%
BTU Input: 44,000 | BTU Output: 35,200
CFM: 1230
Tonnage: 3 Ton
Blower Motor Type: ECM, 5-Speed
Electrical: 120V, 60Hz, Single Phase, 15A Max
Gas Type: Natural Gas (LP kit available)
Ignition: Silicon Nitride Ignitor
Heat Exchanger: Tapered, Non-Welded Clamshell – Aluminized Steel
Vent Connector: 4"
Dimensions: 14.5"W x 28.375"D x 33"H
Weight: 111 lbs
Restricted States: Not for sale in California
PRODUCT SPECIFICATIONS:
| Product Dimensions | 14 1/2'W x 28 3/8'D x 33'H |
| Product Weight | 111 lbs |
| Unit Type | Gas Furnace |
| AFUE | 80% |
| CFM | 1230 |
| Tonnage | 3 |
| Heating Capacity | 44,000 BTU |
| Fuel Type | Natural Gas |
| BTU Input | 44,000 |
| BTU Output | 35,200 |
| Voltage |
Requires a minimum of 120V/60HZ/15A |
| Phase | 1 |
| Cycle | 60 |
| Stage | Single |
| Max Fuse Breaker | 15 |
| Min Circuit Ampacity | 6.8 |
| Color | Gray |
| Full Load | 6.8 |
| Number of Burners | 4 |
| Gas Connection Size | 0.5 |
| Blower Motor Type | ECM |
| Blower Motor HP | 1/2 |
| Blower Motor Speeds | 5 Speed |
| Blower Motor RPM | 535-1230 |
| Heat Exchanger Type | Aluminized steel |
| Ignition Type | Silicon Nitride Ignitor |
| Vent Connector | 4 inch |
| LP Kit Available | Yes |
| Certifications | CSA AHRI |
| Warranty |
Registered 10 Year Parts Warranty |
| Restricted States | Yes (California) |
Quick answers to questions about ordering, compatibility, and installation.
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Manufacturer installation guides and documentation are included or available upon request for most products.
Most HVAC equipment includes a manufacturer warranty when installed according to guidelines. Warranty terms vary by brand and product.
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Larger HVAC equipment ships via freight and should be inspected upon delivery. Delivery details are provided during checkout.
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