A wood fireplace insert can update a compatible existing masonry fireplace with an enclosed wood-burning appliance. The best choice depends on your fireplace's dimensions, your heating needs and the appearance you want for the finished hearth.
Our current wood insert selection focuses on Osburn. Drawing from our top-selling models, this 2026 roundup compares the Matrix, Matrix 1900, Matrix 2700, 3500 and Inspire 2000. Each offers a different reason to consider it, from a smaller firebox to contemporary styling or greater fuel capacity.
Start with compatibility rather than appearance alone. An insert installation requires an assessment of the existing fireplace, chimney, hearth and clearances; it is more involved than simply sliding an appliance into an opening.
Compare Our Wood Fireplace Insert Picks
| Osburn Insert | Our Pick For | Overall Firebox Volume |
|---|---|---|
| Matrix | A starting point for comparing a mid-sized firebox | 2.4 cubic feet |
| Matrix 1900 | Smaller heating needs and detailed cast iron styling | 1.1 cubic feet |
| Matrix 2700 | Traditional cast iron detailing with a larger firebox than the 1900 | 2.5 cubic feet |
| 3500 | Projects that justify a higher-capacity insert | 3.5 cubic feet |
| Inspire 2000 | A contemporary hearth update | 2.4 cubic feet |
Firebox volumes are manufacturer-listed overall volumes, not appliance dimensions or EPA loading volumes. They help compare fuel capacity but do not establish installation fit, burn time or heating suitability.
Osburn Matrix: A Mid-Sized Starting Point
The Osburn Matrix Wood Insert is a useful starting point when comparing the lineup. Its 2.4-cubic-foot overall firebox sits between the smaller Matrix 1900 and the higher-capacity 3500.
Osburn's published heating guidance also places it between those models, making it worth discussing with your installer when you want regular supplemental warmth without automatically choosing the largest insert available.
Why we selected it: It provides a practical reference point for comparing capacity and installation fit across the collection.
Before you buy: Compare its physical dimensions and clearance drawings with your existing fireplace. A similar firebox volume does not mean two inserts require the same opening or surround.
Osburn Matrix 1900: For Smaller Heating Needs
The Osburn Matrix 1900 is the smallest-firebox selection in this roundup. Its 1.1-cubic-foot overall firebox makes it worth considering when a larger heating appliance would be unnecessary for the project.
The cast iron faceplate includes a patterned upper louver and columns framing the door. These details offer a more decorative traditional appearance than a simple flat surround.
Why we selected it: It gives shoppers a smaller-capacity option without giving up a prominent fire view or detailed hearth styling.
Before you buy: A smaller firebox does not guarantee compatibility with a small fireplace opening. Confirm the complete appliance dimensions, liner connection space, hearth protection and clearances.
Osburn Matrix 2700: Traditional Detailing and a Generous Fire View
The Osburn Matrix 2700 Wood Insert with Door combines a 2.5-cubic-foot overall firebox with a cast iron faceplate and a heat-activated blower. Its traditional detailing makes it worth comparing for a hearth where the insert will be a prominent design feature.
Available door-overlay choices provide another way to coordinate the appliance with nearby finishes. Confirm the selected finish and package contents when ordering.
Why we selected it: It offers a larger-capacity alternative to the Matrix 1900 while retaining decorative cast iron styling.
Before you buy: Compare the actual dimensions and documented performance with the standard Matrix. Model numbers and similar firebox volumes do not tell the entire story.
Osburn 3500: Our Higher-Capacity Selection
The Osburn 3500 Wood Insert has the largest overall firebox in this group at 3.5 cubic feet. It belongs on the shortlist when your heating assessment supports a higher-capacity appliance and the existing fireplace can accommodate it.
Door-overlay, faceplate and trim choices help coordinate the finished appearance with your hearth. Compare those selections alongside the installation requirements rather than treating the insert as a single fixed package.
Why we selected it: It provides a distinct capacity option for projects that need more than the smaller inserts featured here.
Before you buy: Bigger is not automatically better. Have a qualified professional evaluate the home's heating demand, layout and installation before choosing the largest firebox.
Osburn Inspire 2000: A Contemporary Hearth Update
The Osburn Inspire 2000 Wood Insert is worth considering if you want the hearth to feel more contemporary. Its clean lines offer a different visual direction from the decorative faceplates of the Matrix 1900 and Matrix 2700.
With a 2.4-cubic-foot overall firebox, it shares a capacity category with the standard Matrix. That makes the two useful models to compare when appearance and installation details will help determine the final choice.
Why we selected it: It gives design-focused shoppers a modern option within the Osburn lineup.
Before you buy: Review the available faceplate configurations, required opening dimensions and hearth relationship. A trim panel can finish the opening, but it cannot correct inadequate clearances or an incompatible fireplace.
How to Choose Between These Wood Inserts
Confirm the Existing Fireplace Is Suitable
Osburn identifies these inserts for installation in existing masonry fireplaces. Do not assume they can be installed in a factory-built metal fireplace or directly into a framed wall. Have a qualified professional evaluate the existing fireplace and chimney before purchasing.
An insert does not repair structural damage or make an unsuitable chimney acceptable. Include any necessary cleaning and repairs in the project plan.
Measure the Entire Firebox
Record the front opening width and height, rear width, usable depth and any tapering, sloped surfaces or obstructions. Your installer should also check the liner connection area and the appliance's required position.
Compare these measurements with the installation drawings for the exact model. Separately check mantel and trim clearances, hearth dimensions and any required thermal protection. A decorative hearth rug does not replace specified floor protection.
Match Capacity to Your Heating Goals
Use manufacturer heating-area guidance as a starting point, not a whole-home heating promise. Climate, insulation, room layout, chimney draft, fuel and operation all affect performance.
When comparing efficiency figures, check whether they use the same reporting basis, such as higher heating value or lower heating value. EPA emissions certification should not be described as an efficiency percentage.
Plan the Liner, Blower and Complete Order
Your installer should confirm the chimney liner configuration, sizing, material, insulation where required, connections and termination using the appliance instructions and applicable local requirements. A liner does not eliminate the need to assess the existing chimney.
Confirm blower inclusion, controls and electrical requirements for the exact insert. A blower helps circulate warmed air; operation without it and any associated limitations depend on the model's instructions.
Include the appliance, selected faceplate and trim, liner system, hearth work, electrical work, labor and applicable permits when comparing project costs. Use only approved accessories and starting methods. Do not add a gas log lighter or separate grate unless the insert manufacturer expressly permits it.
Wood Fireplace Insert FAQs
Which Insert in This List Has the Smallest Firebox?
The Matrix 1900 has the smallest overall firebox in this roundup at 1.1 cubic feet. That makes it worth comparing for smaller heating needs, but physical fit and heating suitability still require a model-specific assessment.
Will an Air-Wash System Keep the Glass Completely Clean?
No. An air-wash system can help limit deposits on the glass, but it does not eliminate cleaning. Fuel condition, draft and operation affect buildup. Follow the manufacturer's cleaning instructions and allow the appliance to cool before servicing it.
Can I Install a Television Above a Wood Insert?
Only consider that layout after checking the insert's clearance requirements, the television manufacturer's temperature and placement limits, and the proposed installation conditions. A mantel, recess or added shield does not automatically make the location suitable.
Final Thoughts
The right wood insert should suit both your existing fireplace and the way you want to heat your space. Compare the Matrix 1900 for smaller heating needs, the Matrix and Inspire 2000 for different styling approaches within a similar capacity category, the Matrix 2700 for traditional detailing, and the 3500 when the project supports a higher-capacity appliance.
Explore our full selection of wood fireplace inserts, or contact our product specialists for help comparing models and identifying required components. Bring fireplace measurements, photos and your heating goals so we can help narrow down the options.
