Osburn 3500 Wood Insert — Serious Heat for Large Homes
Authorized Osburn Dealer | EPA 2020 Certified | Tax Credit Eligible
Heat your home confidently all winter with one of Osburn’s most powerful and efficient wood inserts.
The Osburn 3500 Wood Insert is built for homeowners who want long overnight burns, high heat output, and reliable performance — even in the coldest climates.
✔ Ships from U.S. warehouse
⚠ Limited winter inventory available
WHY HOMEOWNERS CHOOSE THE OSBURN 3500
🔥 Whole-Home Heating Power
Comfortably heats 1,000 – 2,700 sq. ft., making it ideal for medium to large homes and open floor plans.
⏱ Long Overnight Burn Times
Up to 10 hours per load, so you wake up to a warm home — not cold ashes.
♻ Clean, Efficient & EPA 2020 Certified
Low emissions (1.6 g/hr) with high efficiency for cleaner air and lower wood consumption.
💰 Save BIG with the Federal Wood Stove Tax Credit
Eligible for the 30% Federal Tax Credit (based on total installed cost).
Many homeowners save up to $2,000+.
🛠 Non-Catalytic Design
Fewer parts, simpler operation, and easier long-term maintenance.
🔒 Protected by Full Osburn Manufacturer Warranty
Your warranty is fully valid when purchased through us as an authorized dealer.
IS THE OSBURN 3500 RIGHT FOR YOU?
This insert is ideal if you:
✔ Live in a cold or rural climate
✔ Need a primary heat source
✔ Want fewer reloads and strong heat output
✔ Prefer proven reliability over complicated systems
WILL IT FIT MY FIREPLACE?
Minimum Fireplace Opening Required:
- Height: 26 1/4″
- Width: 31″
- Depth: 18 3/8″
👉 Not sure if it fits?
We offer a FREE fireplace & chimney compatibility check before you buy — so there are no costly mistakes.
PERFORMANCE THAT DELIVERS REAL HEAT
- Firebox Volume: 3.5 cu. ft.
- Maximum Heat Output: 110,000 BTU
- Maximum Log Length: 22″
- Efficiency: Up to 77%
- Emissions: 1.6 g/hr
Built to heat large homes, handle long winters, and perform reliably year after year.
WHAT’S INCLUDED
✔ Osburn 3500 Wood Insert
✔ Premium Variable-Speed Blower (144 CFM)
Required Accessories (Sold Separately):
- Door Overlay
- Faceplate
- Faceplate Trim
👉 We help you select the correct accessories so everything fits perfectly the first time.
🛡 BUY WITH TOTAL CONFIDENCE
✔ Factory-Authorized Osburn Dealer
✔ Price Match Guarantee
✔ No Sales Tax (outside WY)
✔ Full Manufacturer Warranty
✔ Pre- and post-purchase expert support
📞 Speak with a stove specialist today — no pressure, no obligation.
WINTER HEATING BONUS — LIMITED TIME
✔ $150 OFF with promo code WINTER
✔ FREE Nationwide Shipping
✔ No Sales Tax (outside WY)
✔ Tax Credit Eligible
⏳ Limited winter inventory available — once it’s gone, restock times may vary.
👉 Order now or check fireplace compatibility before inventory runs out.
IMPORTANT INSTALLATION NOTICE
Professional installation is strongly recommended. Always follow local codes and manufacturer guidelines.
Specifications
Fuel Type; Dry cordwood (16″ recommended)
Color; Metallic Black
Maximum Burn Time ;10 hours
Recommended Heating Area ;1,000 – 2,700 sq. ft.
Overall Firebox Volume ;3.5 cu. ft.
EPA Loading Volume 2.88 cu. ft.
Overall Heat Output Rate 17,200 BTU/h (5.0 kW) to 57,800 BTU/h (16.9 kW)
Maximum Heat Output (Dry Cordwood) 110,000 BTU/h (32.2 kW)
Average Overall Efficiency 71% HHV / 76% LHV
Average Particulate Emissions Rate 1.6 g/h
Average Carbon Monoxide 73 g/h
Optimum Overall Efficiency 77%
Maximum Log Length 22″
Chimney Diameter 6″
Flue Outlet Diameter 6″
Type of Chimney Liner – ULC-S635, ULC-S640, UL1777
Minimum Chimney Height 15 ft.
Glass Type Ceramic glass
Baffle Type C-Cast or equivalent
Shipping Weight 540 lbs
Steel Thickness – Body 3/16″
Steel Thickness – Top 5/16″
Test Standard – Emissions/Efficiency EPA / CSA B415.1-10
USA Standard (Safety) UL 1482, UL 737
Tested and listed as per applicable standards An accredited laboratory
Dimensions
| Overall Dimensions (H x W x D) | 24 7/8″ x 30 3/8″ x 29″ |
| Door Opening Dimensions (H x W) | 9 7/8″ x 19″ |
| Firebox Dimensions (H x W x D) | 12 7/8″ x 22 7/8″ x 20 1/8″ |
| Glass Surface Dimensions (W x H) | 18 7/8″ x 11 3/4″ |
| Fireplace Opening – Minimum (H x W x D) | 26 1/4″ x 31″ x 18 3/8″ |
Warranty
Osburn honors warranties for products purchased through authorized retailers like us. As a factory-authorized online dealer for all brands we carry, we ensure that your purchase retains full manufacturer warranty coverage. Please refer to the owner’s manual in the manufacturer downloads section below for more details.
Manufacture Downloads
- Click Here For Product Brochure
- Click Here For Owners Installation Manual
- Click Here For Owner’s Manual Part 1
- Click Here For Detailed Dimensions
- Click Here For Detailed Specification
- Click Here For Offset Liner Adapter Manual – AC01214
- Click Here For Wood Burning Stove FAQ
- Click Here For Wood Burning Insert FAQ
- Click Here For Full Osburn Catalog
- Click Here For Full Manufacture Warranty
- Click Here For Tax Credit Details
- Click Here For Efficiency Data Summary
Legal Disclaimers & Warnings
Product packaging, owners’ manuals, installation instructions, and/or operating instructions may include more information than what is shown on our website. The content on our site is intended to be used for reference purposes only. Please fully read all included manuals and documentation before installing or using this product. WARNING for California residents: this product may contain chemical(s) known to the state of California to cause birth defects, cancer, or other reproductive harm.
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