Osburn Matrix 1900 Wood-Burning Fireplace Insert
Osburn Matrix 1900 Wood Insert OB01900 – EPA-Certified Wood-Burning Fireplace Insert
The Osburn Matrix 1900 Wood Insert OB01900 is a non-catalytic wood-burning fireplace insert designed for compatible existing masonry fireplaces. It is rated for a manufacturer-recommended heating area of 250 to 1,200 sq. ft., delivers up to 45,000 BTU/h with dry cordwood, offers a maximum burn time of up to 7 hours, and includes a blower rated at up to 90 CFM.
Model
OB01900
Heating Area
250–1,200 sq. ft.
Max Output
45,000 BTU/h
Firebox
1.2 cu. ft.
Max Burn Time
7 Hours
Max Log Length
17"
Blower
Up to 90 CFM
EPA Emissions
1.5 g/h
Required Door Overlay – Sold Separately
A cast-iron door overlay is required to complete the Osburn Matrix 1900 and is not included. Choose the appropriate black or brushed-nickel door overlay before completing the installation.
Compact Wood Heating with Distinctive Cast-Iron Styling
The Matrix 1900 is designed for homeowners who want to convert an existing masonry fireplace into a dedicated cordwood-heating appliance while retaining a traditional fireplace appearance.
Its decorative cast-iron faceplate features a patterned upper louver and detailed columns surrounding a broad ceramic-glass viewing area. A discreet black wooden handle, removable air-control handle, and flush-mounted blower help maintain a clean, integrated appearance.
Inside the firebox, non-catalytic combustion, moulded refractory components, a C-Cast or equivalent baffle, and a stainless-steel secondary-air system support efficient combustion of properly seasoned cordwood.
Efficiency highlight: The Matrix 1900 has a listed average overall efficiency of 75% HHV / 80% LHV, with optimum overall efficiency of 82%.
Osburn Matrix 1900 OB01900 at a Glance
Product Type
Wood-Burning Fireplace Insert
Heating Area
250–1,200 sq. ft.
Maximum Output
45,000 BTU/h
Firebox Volume
1.2 cu. ft.
Maximum Burn Time
Up to 7 Hours
Blower
Included, Up to 90 CFM
Is the Osburn Matrix 1900 Right for Your Fireplace?
Best For
- Compatible existing masonry fireplaces.
- Manufacturer-recommended heating areas from 250–1,200 sq. ft.
- Homeowners wanting a compact wood-burning insert.
- Buyers wanting non-catalytic combustion.
- Installations using a 6-inch listed chimney liner.
- Buyers wanting an included blower up to 90 CFM.
- Homeowners who prefer decorative cast-iron fireplace styling.
- Users burning properly seasoned cordwood up to 17 inches long.
Consider Another Product If
- Your masonry fireplace is smaller than the required minimum opening.
- Your chimney cannot accommodate the required liner system.
- Your installation cannot meet the required combustible clearances.
- You cannot provide the required floor protection.
- You need mobile-home or manufactured-home approval.
- You need an alcove-approved insert.
- You do not want to purchase the required door overlay separately.
- Your heating needs are substantially outside the recommended 250–1,200 sq. ft. range.
Heating Performance & Efficiency
| Recommended Heating Area |
250–1,200 sq. ft. |
| Maximum Heat Output – Dry Cordwood |
45,000 BTU/h (13.19 kW) |
| Overall Heat Output Rate |
8,471–32,293 BTU/h (2.48–9.46 kW) |
| Maximum Burn Time |
Up to 7 Hours |
| Average Overall Efficiency – HHV |
75% |
| Average Overall Efficiency – LHV |
80% |
| Optimum Overall Efficiency |
82% |
| Optimum Heat Transfer Efficiency |
78% |
| Average Particulate Emissions |
1.5 g/h |
| Average CO |
34 g/h |
Performance distinction: The 45,000 BTU/h maximum output and the 8,471–32,293 BTU/h overall heat-output range are different manufacturer performance measurements and should not be treated as interchangeable.
Key Features
Non-Catalytic Combustion
Uses secondary combustion without a catalytic combustor.
45,000 BTU/h Maximum Output
Maximum listed heat output when burning dry cordwood under the specified conditions.
1.2 cu. ft. Firebox
Compact firebox capacity suited to smaller and medium-size heating applications.
17" Maximum Log Length
Accepts logs up to 17 inches, with 16-inch cordwood recommended.
7-Hour Maximum Burn Time
Actual burn duration varies with fuel, moisture, draft, loading, heat demand, and operating conditions.
90 CFM Blower
Included blower helps circulate heated air from the insert into the room.
Ceramic Glass
Large fire-viewing surface in a cast-iron-framed door.
Glass Air-Wash System
Helps support a clearer viewing surface during proper operation.
Cast-Iron Styling
Patterned upper louver, detailed columns, and decorative faceplate styling.
Firebox & Fuel Requirements
| Fuel Type |
Dry Cordwood |
| Nominal Firebox Volume |
1.2 cu. ft. |
| EPA Loading Volume |
1.03 cu. ft. |
| Recommended Log Length |
16" |
| Maximum Log Length |
17" |
| Log Orientation |
East-West |
| Recommended Wood Moisture |
Approximately 15%–20% |
| Baffle Material |
C-Cast or Equivalent |
| Refractory Components |
Moulded Refractory |
| Secondary-Air System |
Stainless Steel |
Burn only suitable cordwood: Do not burn garbage, treated wood, construction debris, plastics, petroleum products, unseasoned wood, or other prohibited materials.
Large Ceramic-Glass Fire View
The Matrix 1900 uses a single glazed door with a cast-iron frame and ceramic glass.
| Glass Viewing Surface |
18" W × 8 1/8" H |
| Door Opening |
18 1/4" W × 7 7/8" H |
| Glass Air-Wash System |
Yes |
Overall & Firebox Dimensions
Overall Insert Dimensions
-
Width: 36"
-
Height: 23 7/8"
-
Depth: 21"
Firebox Dimensions
-
Width: 16 3/4"
-
Height: 8 7/8"
-
Depth: 12 3/8"
Overall dimensions and fireplace-opening dimensions are different. Verify both before ordering.
Minimum Masonry Fireplace Opening
The Matrix 1900 is designed for installation in a compatible masonry fireplace. The existing opening must meet at least the following dimensions:
| Minimum Width |
25" |
| Minimum Height |
19" |
| Minimum Depth |
15 1/2" |
Fresh-air intake note: If the optional fresh-air intake is used, the manufacturer recommends adding at least 4 inches to the minimum fireplace-opening width.
Fit involves more than dimensions: Chimney condition, liner requirements, clearances, floor protection, fresh-air provisions, and local installation requirements must also be verified.
Chimney & Venting Requirements
Recommended Liner Diameter
6"
Minimum Liner Height
12 ft.
Liner Standards
ULC S635, CAN/ULC-S640, UL 1777
Mobile / Manufactured Home
Not Approved
Alcove Installation
Not Approved
Inspection before installation: The existing masonry fireplace and chimney should be inspected for cracks, loose mortar, creosote, obstructions, or other deterioration before installation.
Minimum Clearances to Combustibles
| Adjacent Combustible Side Wall |
16" |
| Combustible Mantel Shelf |
34" |
| Top Clearance from Installation Platform |
72" |
| Combustible Side Surround to Facade |
1" |
| Combustible Top Surround to Facade |
1" |
Certification label priority: Always use the certification label attached to the appliance as the controlling source for final installation requirements.
Floor Protection Requirements
United States
-
Minimum front protection: 16" from the door opening
-
Applicable side protection: 8"
Canada
-
Minimum front protection: 18" from the door opening
-
Applicable side protection: 8"
Hearth configuration matters: Additional non-combustible floor protection can be required depending on the existing hearth extension and surrounding combustible flooring.
Included 90 CFM Blower
A blower rated at up to 90 CFM is included with the Matrix 1900.
The blower increases airflow through the insert's heat-exchange area and helps distribute warm air into the room.
Blower sizing note: The blower does not replace proper appliance sizing for the intended heating space.
Removable Air-Control Handle
The Matrix 1900 uses a removable handle to adjust primary combustion air.
Higher Setting
Moving the air control toward the high setting increases the burn rate.
Lower Setting
Moving the control toward the low setting decreases the burn rate.
Handle safety: Do not leave the removable air-control handle attached after adjustment because it can become very hot during operation.
Required Door Overlay
Black Door Overlay
Part Number: OA10041
Brushed Nickel Door Overlay
Part Number: OA10042
Required to complete the appliance: A compatible cast-iron door overlay must be purchased separately.
Optional Fresh-Air Intake
The Matrix 1900 supports an optional 5-inch fresh-air intake kit.
- The fresh-air connection can be installed on the right or left side of the insert.
- The associated flexible pipe is not included.
- The flexible pipe must meet the manufacturer requirements.
- Using the fresh-air intake affects the space required inside the fireplace opening.
Construction & Standard Equipment
Door
Single glazed door with cast-iron frame.
Baffle
C-Cast or equivalent.
Refractory Components
Moulded refractory.
Secondary-Air System
Stainless steel.
Body Steel Thickness
3/16".
Top Steel Thickness
3/16".
Shipping Weight
332 lb (151 kg).
What's Included?
Matrix 1900 Insert
Osburn OB01900 wood-burning fireplace insert.
Decorative Faceplate Assembly
Included decorative facade components.
Decorative Faceplate Panel
Included.
Cast-Iron Framed Glass Door
Door and ceramic glass included.
Refractory Components
Moulded refractory components included.
Secondary-Air System
Stainless-steel secondary-air system included.
Air-Control Handle
Removable primary-air-control handle included.
Not included: The required black or brushed-nickel cast-iron door overlay.
Certifications & Standards
EPA / CSA Emissions
EPA / CSA B415.1-10
Average Particulate Emissions
1.5 g/h
U.S. Safety Standards
UL 1482, UL 737
Canadian Safety Standard
ULC-S628
Testing
Tested by an accredited laboratory.
Warranty
Osburn Limited Lifetime Warranty, subject to terms.
Complete Osburn Matrix 1900 OB01900 Specifications
| Brand |
Osburn |
| Model |
OB01900 |
| Product Type |
Wood-Burning Fireplace Insert |
| Fuel Type |
Dry Cordwood |
| Combustion Technology |
Non-Catalytic |
| Recommended Heating Area |
250–1,200 sq. ft. |
| Maximum Heat Output |
45,000 BTU/h (13.19 kW) |
| Overall Heat Output Rate |
8,471–32,293 BTU/h (2.48–9.46 kW) |
| Maximum Burn Time |
Up to 7 Hours |
| Average Overall Efficiency |
75% HHV / 80% LHV |
| Optimum Overall Efficiency |
82% |
| Optimum Heat Transfer Efficiency |
78% |
| Average Particulate Emissions |
1.5 g/h |
| Average CO |
34 g/h |
| Nominal Firebox Volume |
1.2 cu. ft. |
| EPA Loading Volume |
1.03 cu. ft. |
| Recommended Log Length |
16" |
| Maximum Log Length |
17" |
| Log Orientation |
East-West |
| Flue Outlet Diameter |
6" |
| Recommended Connector / Liner Diameter |
6" |
| Minimum Liner Height |
12 ft. |
| Liner Standards |
ULC S635, CAN/ULC-S640, UL 1777 |
| Mobile / Manufactured Home Approved |
No |
| Alcove Installation Approved |
No |
| Optional Fresh-Air Intake |
Supported – 5" Kit |
| Overall Width |
36" |
| Overall Height |
23 7/8" |
| Overall Depth |
21" |
| Minimum Fireplace Opening |
25" W × 19" H × 15 1/2" D |
| Door Opening |
18 1/4" W × 7 7/8" H |
| Firebox Dimensions |
16 3/4" W × 8 7/8" H × 12 3/8" D |
| Glass Viewing Surface |
18" W × 8 1/8" H |
| Door Type |
Single Glazed Door with Cast-Iron Frame |
| Glass Type |
Ceramic Glass |
| Glass Air-Wash System |
Yes |
| Baffle |
C-Cast or Equivalent |
| Refractory Components |
Moulded Refractory |
| Secondary-Air System |
Stainless Steel |
| Body Steel Thickness |
3/16" |
| Top Steel Thickness |
3/16" |
| Blower |
Included – Up to 90 CFM |
| Adjacent Side-Wall Clearance |
16" |
| Combustible Mantel-Shelf Clearance |
34" |
| Top Clearance from Installation Platform |
72" |
| Side Surround to Facade |
1" |
| Top Surround to Facade |
1" |
| U.S. Front Floor Protection |
16" |
| Canadian Front Floor Protection |
18" |
| Applicable Side Floor Protection |
8" |
| Required Door Overlay |
OA10041 Black or OA10042 Brushed Nickel |
| Shipping Weight |
332 lb (151 kg) |
| Particulate Emissions Standard |
EPA / CSA B415.1-10 |
| U.S. Safety Standards |
UL 1482, UL 737 |
| Canadian Safety Standard |
ULC-S628 |
| Testing |
Accredited Laboratory |
| Warranty |
Osburn Limited Lifetime Warranty, Subject to Terms |
Flame Authority Expert Recommendation
Choose the Osburn Matrix 1900 OB01900 when you want a compact, non-catalytic wood-burning insert for a compatible masonry fireplace and need a manufacturer-recommended heating range of 250–1,200 sq. ft..
Its 45,000 BTU/h maximum output, 1.2 cu. ft. firebox, 17" maximum log capacity, 7-hour maximum burn time, 75% HHV / 80% LHV average overall efficiency, 1.5 g/h particulate emissions rate, cast-iron styling, ceramic-glass fire view, stainless-steel secondary-air system, moulded refractory components, and included 90 CFM blower make it a strong option for qualifying smaller and medium-size installations.
The most important buying step is verifying the complete fireplace and chimney system. Confirm the 25" × 19" × 15 1/2" minimum masonry opening, 6" liner, 12 ft. minimum liner height, required combustible clearances, floor protection, optional fresh-air requirements, and required door overlay before ordering.
Official Manufacturer Resources
Safety & General Information
Manufacturer safety notifications and general product information for the Osburn Matrix 1900 OB01900.
Installation & Owner's Manual
Manufacturer installation, operation, liner, clearance, floor-protection, fresh-air, maintenance, and safety guidance.
Specifications & Dimensions
Manufacturer dimensions, heating performance, emissions, firebox, blower, and technical specifications.
Osburn Matrix 1900 OB01900 FAQs
What is the Osburn Matrix 1900 OB01900?
The Osburn Matrix 1900 OB01900 is a non-catalytic wood-burning fireplace insert designed for a compatible existing masonry fireplace. It burns dry cordwood and includes a blower rated up to 90 CFM.
How much space can the Osburn Matrix 1900 heat?
Osburn recommends the Matrix 1900 for heating areas from 250 to 1,200 sq. ft. Actual performance depends on climate, insulation, heat loss, chimney draft, fuel quality, layout, and installation conditions.
What size fireplace opening does the Matrix 1900 require?
The minimum masonry fireplace opening is 25" wide × 19" high × 15 1/2" deep.
What are the overall dimensions of the Matrix 1900?
The insert measures approximately 36" wide × 23 7/8" high × 21" deep.
Does the Matrix 1900 include a blower?
Yes. The Matrix 1900 includes a blower rated at up to 90 CFM.
Is the door overlay included?
No. A cast-iron door overlay is required and sold separately. Manufacturer documentation identifies black OA10041 and brushed-nickel OA10042 options.
What size logs fit the Matrix 1900?
The manufacturer recommends 16-inch dry cordwood, with a maximum log length of 17 inches.
How long can the Matrix 1900 burn?
The maximum listed burn time is up to 7 hours. Actual duration varies with wood species, moisture, load size, chimney draft, heat demand, and burn rate.
How efficient is the Osburn Matrix 1900?
The manufacturer lists average overall efficiency of 75% HHV / 80% LHV, with optimum overall efficiency of 82%.
What is the heat output of the Matrix 1900?
The overall heat-output rate is 8,471–32,293 BTU/h, while maximum dry-cordwood output is separately listed at 45,000 BTU/h.
What size chimney liner does the Matrix 1900 require?
The insert has a 6-inch flue outlet and a recommended 6-inch connector/liner diameter, with a minimum liner height of 12 feet.
Is the Matrix 1900 EPA certified?
Yes. The manufacturer identifies it as compliant with the U.S. EPA 2020 cordwood standard, with average particulate emissions of 1.5 g/h.
Can the Matrix 1900 be installed in a mobile or manufactured home?
No. The Matrix 1900 is not approved for mobile or manufactured-home installation.
Is the Matrix 1900 approved for alcove installation?
No. Manufacturer specifications identify the Matrix 1900 as not approved for alcove installation.
Does the Matrix 1900 require floor protection?
Yes. Non-combustible floor protection is required. The supplied information lists a minimum front extension of 16 inches in the United States and 18 inches in Canada, with applicable 8-inch side protection.
What are the minimum combustible clearances?
The supplied information lists a 16-inch adjacent side-wall clearance, 34-inch combustible mantel-shelf clearance, 72-inch top clearance, and applicable 1-inch facade clearances.
Does the Matrix 1900 support a fresh-air intake?
Yes. It supports an optional 5-inch fresh-air intake kit. If used, Osburn recommends allowing at least 4 inches of additional width beyond the minimum fireplace opening.
What type of wood should be burned?
Use seasoned natural cordwood, generally around 15%–20% moisture content. Do not burn prohibited materials such as treated wood, garbage, plastic, construction debris, petroleum products, or unseasoned wood.
What warranty comes with the Matrix 1900?
The Matrix 1900 carries an Osburn Limited Lifetime Warranty, subject to the manufacturer's component-specific coverage periods, exclusions, installation requirements, maintenance requirements, and other terms.
Before You Order
Confirm Before Purchase
- You specifically need the Osburn Matrix 1900 OB01900.
- Your masonry fireplace meets the 25" W × 19" H × 15 1/2" D minimum opening.
- Your chimney can accommodate the required 6-inch liner.
- Your installation can meet the 12-foot minimum liner-height requirement.
- You can maintain the required combustible clearances.
- You can provide the required floor protection.
- You have selected the required black or brushed-nickel door overlay.
- You have accounted for additional opening width if using the optional fresh-air intake.
- You understand that mobile/manufactured-home installation is not approved.
- You understand that alcove installation is not approved.
Do Not Assume
- That the door overlay is included.
- That overall appliance dimensions and minimum fireplace-opening dimensions are interchangeable.
- That 45,000 BTU/h is the same measurement as the overall heat-output range.
- That the optional fresh-air intake does not affect required fireplace-opening space.
- That the insert is mobile-home approved.
- That alcove installation is supported.
- That the included blower replaces correct appliance sizing.
- That published website clearances override the appliance certification label.
Final planning check: Use the Osburn Matrix 1900 Safety & General Information, Installation & Owner's Manual, Specifications & Dimensions document, and appliance certification label to verify fireplace fit, liner requirements, clearances, floor protection, optional fresh-air provisions, required door overlay, and final installation before ordering.
