Name: Osburn 30-Inch 3500 Wood Burning Fireplace InsertOB03510
Brand: Osburn
SKU: 14058
Availability: InStock
Rating: 4.70 (10 reviews)

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

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.

Additional information

Brands	Osburn
BTU	20000 – 30000 BTU, 30000 – 40000 BTU, 40000 – 50000 BTU, 50000 – 60000 BTU
EPA Approved	Yes
size	Extra Large (1200 – 3000 sq ft), Large (750 – 2000 sq ft)

Shipping & Delivery

At Northwood Stoves, we make sure your stove arrives safely, quickly, and with full transparency. Here’s everything you need to know about how your order gets to you.

🚚 Fast & Reliable Shipping

We partner with trusted freight carriers to deliver stoves and heavy items securely anywhere in the continental U.S. Smaller accessories may ship via standard parcel carriers like UPS or FedEx.

📦 Order Processing

Most orders are processed within 1–3 business days. Once your order ships, you’ll receive a tracking number so you can follow your delivery every step of the way.

🪵 Freight Delivery for Large Items

Wood stoves, inserts, and other large appliances ship via LTL freight.
Freight deliveries include:

Curbside delivery (the carrier brings it to the end of your driveway)
Appointment scheduling (the carrier contacts you to set a delivery window)
Liftgate service when available, making unloading easier

🔍 Inspecting Your Delivery

Before signing for your shipment, please inspect the packaging and item for any signs of damage.
If something looks off, note it on the delivery receipt and contact us right away—we’ll fix it quickly.

🌎 Shipping Locations

At this time, we deliver to the contiguous United States. If you need special shipping arrangements, reach out and our team will be happy to help.

💬 Questions About Your Shipment?

Our support team is here to help with tracking updates, delivery questions, or special shipping requests. Just contact us anytime.

🔥 Trusted Experts in Heating Solutions

At Northwood Stoves, we specialize exclusively in high-quality heating products. Our team knows wood stoves, pellet stoves, and accessories inside and out—so you get reliable guidance every step of the way.

🪵 Top-Tier Brands You Can Count On

We only offer products from reputable, proven manufacturers known for durability, safety, and long-term performance. No gimmicks—just dependable stoves built to last.

💬 Real Support From Real People

Whether you’re choosing your first stove or upgrading an existing system, our support team is ready to help. We answer your questions clearly and never pressure you into a purchase.

🚚 Fast, Secure Shipping

Your stove is delivered safely and on time. We work with trusted carriers to ensure your order arrives in perfect condition, with tracking provided from warehouse to doorstep.

🛠️ Quality You Can Trust

Every product we carry is vetted for craftsmanship, reliability, and efficiency. You can feel confident that your investment is backed by long-lasting quality.

💯 Satisfaction-First Promise

We want you to love your purchase. If something isn’t right, we’ll work quickly to make it right with responsive service and customer-first solutions.

🌲 Your Comfort, Our Priority

Heating your home shouldn’t be complicated. We provide a smooth, transparent buying experience so you can focus on staying warm and enjoying your space.

At Northwood Stoves, we believe you should never have to choose between top-quality heating products and the best possible price. That’s why we proudly offer our Best Price Guarantee.

🔥 Found a Lower Price? We’ll Match It.

If you find the same stove, insert, or accessory offered by an authorized retailer at a lower price, just let us know—we’ll match it. No hassle, no gimmicks.

🪵 How It Works

To qualify, the item must be:

The same brand, model, and configuration
In stock and available for immediate purchase from the competitor
Sold by a licensed, authorized dealer
Listed at a publicly advertised price (not a private quote)

📝 How to Request a Price Match

Simply contact our support team with:

A link to the competitor’s product page
A screenshot of the advertised price (if needed)

Our team will verify the details and quickly match the price.

💯 Shop With Total Confidence

When you buy from Northwood Stoves, you’re guaranteed top-quality products at the best price—every time. That’s our promise to you.

Product price:	$3,479.00
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Osburn 30-Inch 3500 Wood Burning Fireplace InsertOB03510

REQUIRED ACCESSORIES