Osburn Horizon Zero-Clearance Wood-Burning Fireplace (OB04010)
High-Output Wood Fireplace for Large, Open Living Spaces
The Osburn Horizon is a powerful zero-clearance wood fireplace delivering long burn times, clean combustion, and exceptional heating performance for expansive homes.
Key Features
- Heats up to 2,800 sq. ft.
- Massive 4.28 cu. ft. firebox holds up to 60 lbs of wood
- 95,000 BTU maximum heat output
- EPA 2020 certified with low 1.6 g/hr emissions
- Optional ROBAX® NightFlame ceramic glass upgrade
Product Features
Large-Capacity Firebox for Extended Burns
With a 4.28 ft³ combustion chamber, the Osburn Horizon supports impressive wood loads and delivers up to 11 hours of burn time, reducing reload frequency.
High-Efficiency, Low-Emission Performance
This non-catalytic fireplace meets EPA 2020 standards, combining intelligent air control with clean combustion for efficiency and environmental responsibility.
Designed for Zero-Clearance Installations
Engineered for framed installations, the Horizon offers a clean, modern aesthetic that integrates seamlessly into both traditional and contemporary home designs.
Optional ROBAX® NightFlame Ceramic Glass
Upgrade to semi-transparent black NightFlame glass to enjoy vivid flames when burning and a refined, concealed firebox appearance when the fire is out.
Built in Canada for Long-Term Reliability
Manufactured with heavy-duty steel, cast iron doors, and moulded refractory bricks, the Horizon is designed for decades of dependable performance.
Product Specifications
Appliance Performance
| Specification |
Details |
| Fuel Type |
Dry cordwood (16" recommended) |
| Heating Area |
1,000 – 2,800 sq. ft. |
| Firebox Volume |
4.28 ft³ |
| EPA Loading Volume |
4.28 ft³ |
| Maximum Burn Time |
11 hours |
| Maximum Heat Output |
95,000 BTU/h (27.8 kW) |
| Overall Heat Output Range |
16,900 – 43,000 BTU/h |
| Average Overall Efficiency |
64% HHV / 69% LHV |
| Optimum Efficiency |
70% |
| Optimum Heat Transfer Efficiency |
69% |
| Particulate Emissions |
1.6 g/hr |
| Average CO |
159 g/hr |
General Construction & Features
| Feature |
Details |
| Combustion Technology |
Non-catalytic |
| EPA Certification |
EPA 2020 approved |
| Maximum Log Length |
25" |
| Log Positioning |
Loading over width |
| Baffle Type |
C-Cast or equivalent |
| Glass Type |
Ceramic glass |
| Glass Size |
29 3/4" W × 13 1/2" H |
| Glass Air-Wash System |
Yes |
| Door Type |
Double doors, cast iron frame |
| Blower Included |
Yes (176 CFM) |
| Refractory Bricks |
Moulded |
| Secondary Air System |
Stainless steel |
| Mobile Home Approved |
No |
| Shipping Weight |
560 lb (254 kg) |
Fireplace Dimensions
| Dimension |
Measurement |
| Overall Width |
50 3/4" |
| Overall Height |
43 3/8" |
| Overall Depth |
31 3/4" |
| Door Opening Width |
33" |
| Door Opening Height |
12 3/4" |
| Firebox Width |
25 3/8" |
| Firebox Height |
17" |
| Firebox Depth |
17 7/8" |
Venting & Chimney Requirements
| Specification |
Details |
| Chimney Diameter |
8" |
| Flue Outlet Diameter |
8" |
| Minimum Chimney Height |
15 ft |
| Chimney Standard |
CAN/ULC S629, UL 103 HT (2100°F) |
Approved Chimney Systems*
| Manufacturer |
Brand |
Type |
Diameter |
| American Metal |
HSS / HS |
AC Triple Wall |
8" |
| DuraVent |
DuraTech / DuraTech Canada |
Solid Pack |
8" |
| DuraVent |
DuraPlus / HTC |
Solid Pack |
8" |
| Metal Fab |
Temp Guard |
Solid Pack |
8" |
| Olympia Chimney |
Champion / Rockford |
Solid Pack |
8" |
| SBI Venting |
Ventis / Nexvent |
Solid Pack |
8" |
| Security Chimney |
S-2100+ |
Solid Pack |
8" |
| Selkirk |
CF Sentinel / Super Pro / Super Vent |
Solid Pack |
8" |
*Specific components may be required depending on manufacturer.
Clearance to Combustibles
| Clearance |
Canada |
USA |
| Top Clearance |
84" |
84" |
| Side Wall Clearance |
24" |
24" |
| Combustible Side Mantle |
8" |
8" |
| Shelf to Fireplace Base |
N/A |
N/A |
Always follow the certification label and installation manual.
Required Components (Included)
⚠️ The following components are required to complete installation:
These components are mandatory for finishing and proper installation.
Warranty
Warranty Coverage – Osburn Wood Fireplaces
Osburn wood fireplaces are backed by a limited lifetime manufacturer’s warranty that covers specific components for varying durations. Coverage applies to the original purchaser and is subject to proper installation and use per the owner’s manual.
Warranty Coverage:
| Component / Description |
Parts Coverage |
Labor Coverage |
| Combustion chamber (welds only) and cast-iron door frame |
Lifetime* |
5 years |
| Ceramic glass**, plating (manufacturing defect**), convector air-mate |
Lifetime* |
N/A |
| Surrounds, heat shields, ash drawer, steel legs, pedestal, trims (aluminum extrusions), vermiculite, C-Cast or equivalent baffle**, secondary air tubes**, removable stainless steel combustion chamber, deflectors, and supports |
7 years* |
N/A |
| Handle assembly, glass retainers, and air control mechanism |
5 years |
3 years |
| Removable carbon steel combustion chamber components |
5 years |
N/A |
| Standard and optional blower, heat sensors, switches, rheostat, wiring, and electronics |
2 years |
1 year |
| Paint (peeling**), gaskets, insulation, ceramic fiber blankets, refractory bricks (fireplace only*) and other options |
1 year |
N/A |
| All replacement parts supplied under warranty |
90 days |
N/A |
Important Warranty Notes
- Lifetime coverage is limited to one replacement.
- Photo documentation may be required to validate claims.
- Warranty applies to manufacturing defects only.
- Damage caused by improper installation, misuse, abuse, over-firing, or failure to follow installation instructions is not covered.
- Labor coverage applies only where explicitly stated.
- Warranty terms are subject to the manufacturer’s full warranty policy.
What This Means for Homeowners
Osburn’s warranty reflects long-term confidence in the structural components that matter most—while clearly defining wear items and electronics that naturally experience use-related aging.
For full warranty eligibility:
- Installation must comply with the owner’s manual
- Appliance must be operated using approved fuels
- Routine maintenance must be performed as recommended
About the Manufacturer
Who Is Osburn?
Osburn is a Canadian manufacturer specializing in high-efficiency wood stoves and zero-clearance wood fireplaces designed for real-world home heating. The brand is widely recognized in North America for producing EPA-certified wood-burning appliances that combine strong heat output, clean combustion, and durable construction.
Founded in Québec, Canada, Osburn has built its reputation around performance-driven wood heating, offering products capable of heating entire homes while meeting modern emissions and safety standards.
What Is Osburn Known For?
Osburn is best known for:
- Zero-clearance wood fireplaces with high BTU output
- EPA 2020–certified wood-burning technology
- Non-catalytic combustion systems that simplify operation
- Large fireboxes and extended burn times
- Canadian manufacturing and engineering standards
Osburn fireplaces are designed to deliver both ambiance and functional heat, making them suitable for homeowners seeking a real wood fire that also contributes meaningful warmth.
Where Are Osburn Fireplaces Made?
Osburn fireplaces and wood stoves are designed and manufactured in Canada. The brand operates under Stove Builder International (SBI), one of North America’s largest and most established hearth appliance manufacturers.
This manufacturing structure allows Osburn to maintain:
- Consistent quality control
- In-house testing and certification
- Long-term parts availability
- Proven reliability across product lines
Are Osburn Fireplaces EPA Certified?
Yes. Osburn wood fireplaces meet EPA 2020 emissions standards, making them compliant for installation in the United States. These certifications ensure:
- Lower particulate emissions
- Improved fuel efficiency
- Cleaner-burning fires compared to older wood fireplaces
Many Osburn models are also certified to UL and ULC safety standards for use in both the U.S. and Canada.
Can Osburn Fireplaces Be Used for Heating a Home?
Yes. Many Osburn wood fireplaces are capable of heating 750 to over 2,000 square feet, depending on the model, home layout, and installation. While often installed for ambiance, Osburn fireplaces are frequently used as:
- Primary heat sources in open-concept homes
- Supplemental heating systems to reduce reliance on fossil fuels
- Emergency heat during power outages
Osburn’s Design Philosophy: Beyond Fire
Osburn describes its approach as “Beyond Fire”—a focus on preserving the authenticity of a real wood fire while reimagining it for modern homes. This philosophy emphasizes:
- Efficient combustion
- Clean-burning technology
- Durable materials
- Contemporary styling that fits today’s interiors
The result is a fireplace that delivers more than just appearance—it delivers dependable heat.
Why Homeowners Choose Osburn
Homeowners choose Osburn fireplaces because they offer:
- Canadian-made quality
- High heat output with clean emissions
- EPA 2020 compliance
- Zero-clearance installation flexibility
- Large glass viewing areas
- Long-term manufacturer support
Osburn Manufacturer FAQ
Is Osburn a good brand for wood fireplaces?
Yes. Osburn is widely regarded as a high-quality Canadian brand known for efficient, EPA-certified wood fireplaces and stoves.
Are Osburn fireplaces suitable for heating?
Yes. Many Osburn fireplaces are designed to heat large areas and can serve as primary or supplemental heat sources.
Are Osburn fireplaces EPA 2020 compliant?
Yes. Osburn wood fireplaces meet EPA 2020 emissions standards for installation in the U.S.
Where is Osburn located?
Osburn is based in Québec, Canada, and is part of Stove Builder In
Skip to content
Recommended Heating Area by Climate Zone