Osburn 3500 Wood Burning Fireplace Insert with Blower - OB03510 - Heats 2700 Sq Ft

Q: What is the actual size of the exterior and the measurements for the inside?

Provided is the dimensions sheet for the model. If you have any further questions we recommend that you give us a call! Thanks. chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://hvacdirect.com/media/hvac/pdf/osburn-3500-dimensions.pdf

Q: Does this stove qualify for a tax credit?

This model qualifies for tax credit, but bear in mind that this is a fireplace insert and not a stove. We do carry wood-burning stoves that qualify for tax credit as well, such as the Osburn 3300.

Osburn 3500 Wood Burning Fireplace Insert with Blower - OB03510 - Heats 2700 Sq Ft

Osburn 3500 Wood Burning Fireplace Insert - 31"

Osburn 3500 Wood Burning Fireplace Insert - 31" - 2

Osburn

In stock

Model

OB03510

82780

Rating:

95% of 100

See 4 Reviews Add Your Review

15 Questions Answered

In Stock - Ready to Ship

Was $3,819.00 Your Low Price Special Price $3,719.00

Free Shipping

Heats 2700 Square Feet
Heat Circulating Blower Included
Minimum Fireplace Dimensions: 31"W x 26 1/4"H x 18 3/8"D

Description

The Osburn 3500 Wood Insert is the biggest and baddest non-catalytic wood insert on the market. No problems getting an overnight burn with the massive 3.5 cubic foot fire box. Producing up to 110,000 BTUs, the Osburn 3500 will comfortably heat up to 2,700 square feet in your home.

Choose from our selection of door overlays, faceplates, and faceplate finishes to make it truly unique to suit your home’s décor. Leave the ordinary behind and get this beautiful and powerful fireplace insert.

Features

BTU's: 110,000
Weight: 540 lbs
Heat Capacity: 1,000 – 2,700 square feet
Minimum Fireplace Dimensions: 31"W × 26 1/4"H × 18 3/8"D
Ceramic Glass Size: 18 7/8"W × 11 3/4"H
Maximum Burn Time: 10 hours
Maximum Efficiency: 77%
Firebox Volume: 3.5 cubic feet
Max Firewood Length: 22"
Emissions Grams/Hour: 1.32
Flue Size: 6"
Warranty: Limited Lifetime
Certification: EPA, UL 1482, UL 737
This model IS Mobile Home Approved

More About Wood Burning Appliances

Heating with wood offers a timeless and renewable source of warmth, creating an ambiance only watching a real fire can create. Whether you considering a Freestanding Wood Stove, Wood Fireplace Insert, a Built In EPA-Approved Heating Fireplace or an Open Burning Built In Fireplace, you will find today's modern appliances offer increased efficiency and safety features compared to older wood appliances.

Available Types:

Freestanding Wood Stoves
Wood Fireplace Inserts
Open Burning Built In Wood Fireplaces
High-Efficiency Built In Wood Fireplaces

More About Fireplace Inserts

Fireplace Inserts are high-efficiency heating appliances designed to be installed into an existing fireplace opening. Fireplace Inserts offer a range of benefits, including: increased efficiency, higher heat output, are safer to operate, improve fireplace aesthetics and are often easier to operate.

Available Types:

Wood Burning Fireplace Inserts
Gas Direct Vent Fireplace Inserts
Ventless Fireplace Inserts
Pellet Stove Inserts
Electric Fireplace Inserts

Note: Fireplace Inserts cannot be installed into a wood framed cavity.

Product Specifications

More Information
Osburn 3500 Wood Burning Fireplace Insert with Blower - OB03510 - Heats 2700 Sq Ft
Feature	Spec
SKU	OB03510
Weight (in lbs)	540.000000
Brand/Manufacturer	Osburn
Heating BTU	110,000
Flue Outlet	6" Diameter \| Top
Square Footage	1,000 - 2,700
Electrical	120V (Included Blower)
Amperage Requirement	Less Than 5 Amps
Material	Steel
Type	Brick & Stone Fireplace Insert
Ignition Type	Match Light
Fuel Type	Wood
Certification	EPA, UL 1482
Size Range	30" - 39" Wide
Area Heated	2500 - 2999 Sq. Ft
Fireplace Style	Traditional
Viewing Area	18 7/8"W x 11 3/4"H
Minimum Fireplace Dimensions	31"W x 26 1/4"H x 18 3/8"D
Max Log Length	22"
Warranty	Limited Lifetime
Resources	Dimensions Heating Sq. Ft. By Climate Zone Installation Instructions Tax Credit Certification
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.

Reviews 4

Top reviews

Insert

Quality
100%

Service
100%

Price
100%

Insert is awesome. Heats up house no problem.
Review by Bobby
Posted on 1/20/26
Review

Quality
100%

Service
60%

Price
80%

Service took forever but the fireplace was really nice
Review by Dawson
Posted on 1/12/26
Excellent

Price
100%

Service
100%

Quality
100%

This fireplace is awesome. It took a long time to arrive, but it was worth the wait. I wish I could attach pics of the finished product. I got the nickel trim, with the hammered finish wood stand, great product.
Review by D
Posted on 10/29/23
No issues

Price
100%

Service
100%

Quality
100%

No issues. I have not had time to install the wood insert, yet. We are remodeling my son’s house, and are not quite to that point, yet. I will say the way the unit was packaged/wrapped was very good!
Review by Mike
Posted on 3/21/23

Questions and Answers

Customer Questions

Where are you located?

Our office is located in Troy, OH and we have warehouses located in Dayton, OH as well as Atlanta, Georgia. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.

Do I need a blower for my fireplace insert?

A blower is a great addition to a fireplace insert that helps boost heat output and improves efficiency by circulating warm air more effectively throughout your room. While most inserts can operate without a blower, adding one is beneficial if you want faster, more even heating. If extra heat isn’t necessary, your insert will still work well without a blower.

What is a faceplate or surround for a fireplace insert?

A faceplate, surround, or trim kit is used with fireplace inserts to cover and close the gap between the insert and the fireplace opening. It helps create a clean, finished look while ensuring a proper fit, and should be sized slightly larger than your fireplace’s width and height. Various sizes are available to match common fireplace openings for a seamless installation.

Do any wood inserts qualify for a federal tax credit?

Yes, wood-burning inserts that meet government efficiency standards and qualify for the 30% federal tax credit are clearly marked at the top of each product description on HVACDirect.com. You can also view all qualifying models in one place at https://hvacdirect.com/stoves/tax-credit-stoves.html to find the best option for your home.

Do I need a chimney liner for my wood stove or fireplace insert?

A stainless steel chimney liner kit is always recommended when installing a wood-burning fireplace insert or freestanding stove in a masonry chimney. The liner ensures a consistent and safe flow of exhaust gases, improving the draft and overall efficiency of your appliance while protecting your chimney from heat and corrosion. Using a chimney liner helps maintain safety and enhances stove performance.

What size wood insert is right for my home?

Choosing the right size wood insert depends on both your heating needs and the dimensions of your existing fireplace. Be sure to measure your fireplace’s width, height, and depth, then compare those to the minimum fireplace dimensions listed on each product page to ensure a proper fit. Generally, small inserts heat up to 1,500 sq. ft., medium inserts cover up to 2,500 sq. ft., and large inserts can heat areas larger than 2,500 sq. ft., though actual performance varies based on factors like firewood type, room layout, ceiling height, and insulation.

Can this be inserted in a wood framed fireplace?

This must be installed in a functioning masonry fireplace. If you have any further questions please feel free to give us a call! Thanks.

Does it have an ashtray?

Hello, there is no ashtray but there is an ash lip that allows for the ash to be contained within the unit and prevents it from making a mess. If you have any further questions please feel free to give us a call! Thank you.

What is the actual size of the exterior and the measurements for the inside?

Provided is the dimensions sheet for this model. If you have any further questions we recommend that you give us a call! Thanks.

Does this stove qualify for a tax credit?

Yes this model qualifies for tax credit. Bear in mind however that this model is a fireplace insert and not a stove. We do have wood-burning stoves that qualify for tax credit as well, such as the Osburn 3300 stove. If you have any further questions, please call us and we will be happy to assist you.

Does this stove come with a fan?

Yes, this unit does come with the blower included. If you have any further questions please feel free to give us a call! Thanks.

Will this fit a Temco 36-3 fireplace?

Please give us a call so we can get a little more information about your exact situation. That way we can give you a confident answer to your question.

Is 13x13 inch Terra Cotta top plate available?

We recommend you either give us a call to speak with a representative who can answer part questions or to reach out to the manufacturer themselves. Our team can help you find the part you are looking for.

Does it automatically adjust the airflow on startup and reloads?

The Osburn luckily does not have a timer on the air control for startup and reloads. That technology sounds good in theory but has had issues in the field. If you have any further questions please feel free to give us a call! Thanks.

Why is the 3500 cheaper than the 2700 ,a bigger model, more btu?

The 2700 is a more compact heater, designed to be flush mounted into a masonry fireplace with a more decorative cast iron façade. The 3500 is absolutely a larger, workhorse of a heater. If you have any further questions please feel free to give us a call! Thanks.