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In Stock

Osburn 3500-I Extra Large Wood Insert - OB03510

Starting at: Subtotal: $3,819.00 $3,819.00
UPC:
773388210124
Osburn 3500-I Extra Large Wood Insert

In Stock

Osburn 3500-I Extra Large Wood Insert - OB03510

Starting at: Subtotal: $3,819.00 $3,819.00
UPC:
773388210124

| Model #: OB03510

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  • BTU: 110,000

  • Unit Width: 30 3/8"

  • Unit Height: 24 7/8"

  • Unit Depth: 29"

  • Firebox Volume: 3.5 cu ft

  • Min. Existing Fireplace Opening Width: 31"

  • Min. Existing Fireplace Opening Height: 26 1/4"

  • Min. Existing Fireplace Opening Depth: 18 3/8"

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Starting at: Subtotal: $3,819.00 $3,819.00
Osburn 3500-I Extra Large Wood Insert

In Stock

Osburn 3500-I Extra Large Wood Insert - OB03510

Starting at: Subtotal: $3,819.00 $3,819.00
                    
    Manual            Spec Sheet
 
 

The Osburn 3500 Wood Insert combines exceptional power, efficiency, and safety in a sleek, modern design. Featuring one of the largest viewing areas in its class, it showcases the beauty of a real wood fire while delivering serious heat for your home. Crafted with renowned Canadian engineering, this insert is built for reliable, high-performance heating—even in the harshest winter conditions. Its clean lines allow it to blend seamlessly into a wide range of home styles, while customizable options like door overlays, faceplates, and trims let you tailor the look to match your space perfectly.

 

Features:

  • Efficient Non-Catalytic Performance
    Simple, reliable combustion system delivers strong heat output with fewer maintenance requirements.
  • Heavy-Duty Cast Iron Construction
    Durable cast iron door with optional overlay designs adds both strength and timeless style.
  • Cleaner Glass, Better Fire View
    Built-in air-wash system helps keep the ceramic glass clearer so you can enjoy the flames longer.
  • Powerful Heat Distribution
    Includes a 144 CFM blower to push warm air throughout your space for consistent comfort.
  • Optimized Heat Retention
    Firebox is lined with refractory bricks to improve heat distribution and overall efficiency.
  • Advanced Combustion System
    Stainless-steel secondary-air system enhances burn efficiency while reducing emissions.
  • Built to Last
    Backed by a limited lifetime warranty for long-term peace of mind.
  • EPA 2020 Certified Efficiency
    High-efficiency, clean-burning design meets strict EPA standards for performance and environmental responsibility.

***Wood-burning inserts must only be installed inside an existing masonry fireplace and never in a wooden or combustible structure.

Specifications:

  • Heating coverage area: 1,000 to 2,700 ft²
  • Maximum heat output: 110,000 BTU/h
  • Firebox / combustion chamber overall volume:  3.5 cu ft
  • EPA loading volume: 2.84 cu ft
  • Maximum burn time: up to 10 hours
  • Minimum Fireplace Opening: 26 1/4" H  x  31" W  x  18 3/8" D
  • Overall dimensions: 24-7/8″ H × 30-3/8″ W × 29″ D
  • Door Opening: 9 7/8" H x 19" W
  • Interior Firebox Dimensions: 12 7/8" H  x  22 7/8" W  x  20 1/8" D
  • Glass Surface Dimensions: 18 7/8" W  x  11 3/4" H
  • Weight: 540lbs

 

 

 

Accessories:

  • Door Overlay: Black, Brushed Nickel
  • Faceplate: Medium (32" x 44"), Large (32" x 50")
  • Faceplate Trim: Black - Medium or Large, Brushed Nickel - Medium or Large
  • Firescreen: Osburn Rigid Firescreen
  • Liner Adapter: Osburn Offset Liner Adapter
  • Air Intake Kit:  5" Fresh Air Intake Kit with 4' of Insulated Flex Pipe

Warranty: 

  • Lifetime: Firebox welds, cast iron door, ceramic glass
  • 7 Years: Baffles, air tubes, heat shields, and internal components
  • 5 Years: Handles, air controls, glass retainers
  • 2 Years: Blower, wiring, switches, and electronics
  • 1 Year: Paint, gaskets, insulation, firebricks
  • Warranty Can Be Void If: Product is improperly installed, misused, modified, not maintained, or not operated according to manufacturer guidelines

Labour

  • Up to 5 years on major components
  • Up to 3 years on controls
  • 1 year on electrical parts

Extras

  • 90-day warranty on replacement parts

 

Overview

                    
    Manual            Spec Sheet
 
 

The Osburn 3500 Wood Insert combines exceptional power, efficiency, and safety in a sleek, modern design. Featuring one of the largest viewing areas in its class, it showcases the beauty of a real wood fire while delivering serious heat for your home. Crafted with renowned Canadian engineering, this insert is built for reliable, high-performance heating—even in the harshest winter conditions. Its clean lines allow it to blend seamlessly into a wide range of home styles, while customizable options like door overlays, faceplates, and trims let you tailor the look to match your space perfectly.

 

Features:

  • Efficient Non-Catalytic Performance
    Simple, reliable combustion system delivers strong heat output with fewer maintenance requirements.
  • Heavy-Duty Cast Iron Construction
    Durable cast iron door with optional overlay designs adds both strength and timeless style.
  • Cleaner Glass, Better Fire View
    Built-in air-wash system helps keep the ceramic glass clearer so you can enjoy the flames longer.
  • Powerful Heat Distribution
    Includes a 144 CFM blower to push warm air throughout your space for consistent comfort.
  • Optimized Heat Retention
    Firebox is lined with refractory bricks to improve heat distribution and overall efficiency.
  • Advanced Combustion System
    Stainless-steel secondary-air system enhances burn efficiency while reducing emissions.
  • Built to Last
    Backed by a limited lifetime warranty for long-term peace of mind.
  • EPA 2020 Certified Efficiency
    High-efficiency, clean-burning design meets strict EPA standards for performance and environmental responsibility.

***Wood-burning inserts must only be installed inside an existing masonry fireplace and never in a wooden or combustible structure.

Specifications:

  • Heating coverage area: 1,000 to 2,700 ft²
  • Maximum heat output: 110,000 BTU/h
  • Firebox / combustion chamber overall volume:  3.5 cu ft
  • EPA loading volume: 2.84 cu ft
  • Maximum burn time: up to 10 hours
  • Minimum Fireplace Opening: 26 1/4" H  x  31" W  x  18 3/8" D
  • Overall dimensions: 24-7/8″ H × 30-3/8″ W × 29″ D
  • Door Opening: 9 7/8" H x 19" W
  • Interior Firebox Dimensions: 12 7/8" H  x  22 7/8" W  x  20 1/8" D
  • Glass Surface Dimensions: 18 7/8" W  x  11 3/4" H
  • Weight: 540lbs

 

 

 

Accessories:

  • Door Overlay: Black, Brushed Nickel
  • Faceplate: Medium (32" x 44"), Large (32" x 50")
  • Faceplate Trim: Black - Medium or Large, Brushed Nickel - Medium or Large
  • Firescreen: Osburn Rigid Firescreen
  • Liner Adapter: Osburn Offset Liner Adapter
  • Air Intake Kit:  5" Fresh Air Intake Kit with 4' of Insulated Flex Pipe

Warranty: 

  • Lifetime: Firebox welds, cast iron door, ceramic glass
  • 7 Years: Baffles, air tubes, heat shields, and internal components
  • 5 Years: Handles, air controls, glass retainers
  • 2 Years: Blower, wiring, switches, and electronics
  • 1 Year: Paint, gaskets, insulation, firebricks
  • Warranty Can Be Void If: Product is improperly installed, misused, modified, not maintained, or not operated according to manufacturer guidelines

Labour

  • Up to 5 years on major components
  • Up to 3 years on controls
  • 1 year on electrical parts

Extras

  • 90-day warranty on replacement parts

 

Product Resources

                    
    Manual            Spec Sheet
 
 

The Osburn 3500 Wood Insert combines exceptional power, efficiency, and safety in a sleek, modern design. Featuring one of the largest viewing areas in its class, it showcases the beauty of a real wood fire while delivering serious heat for your home. Crafted with renowned Canadian engineering, this insert is built for reliable, high-performance heating—even in the harshest winter conditions. Its clean lines allow it to blend seamlessly into a wide range of home styles, while customizable options like door overlays, faceplates, and trims let you tailor the look to match your space perfectly.

 

Features:

  • Efficient Non-Catalytic Performance
    Simple, reliable combustion system delivers strong heat output with fewer maintenance requirements.
  • Heavy-Duty Cast Iron Construction
    Durable cast iron door with optional overlay designs adds both strength and timeless style.
  • Cleaner Glass, Better Fire View
    Built-in air-wash system helps keep the ceramic glass clearer so you can enjoy the flames longer.
  • Powerful Heat Distribution
    Includes a 144 CFM blower to push warm air throughout your space for consistent comfort.
  • Optimized Heat Retention
    Firebox is lined with refractory bricks to improve heat distribution and overall efficiency.
  • Advanced Combustion System
    Stainless-steel secondary-air system enhances burn efficiency while reducing emissions.
  • Built to Last
    Backed by a limited lifetime warranty for long-term peace of mind.
  • EPA 2020 Certified Efficiency
    High-efficiency, clean-burning design meets strict EPA standards for performance and environmental responsibility.

***Wood-burning inserts must only be installed inside an existing masonry fireplace and never in a wooden or combustible structure.

Specifications:

  • Heating coverage area: 1,000 to 2,700 ft²
  • Maximum heat output: 110,000 BTU/h
  • Firebox / combustion chamber overall volume:  3.5 cu ft
  • EPA loading volume: 2.84 cu ft
  • Maximum burn time: up to 10 hours
  • Minimum Fireplace Opening: 26 1/4" H  x  31" W  x  18 3/8" D
  • Overall dimensions: 24-7/8″ H × 30-3/8″ W × 29″ D
  • Door Opening: 9 7/8" H x 19" W
  • Interior Firebox Dimensions: 12 7/8" H  x  22 7/8" W  x  20 1/8" D
  • Glass Surface Dimensions: 18 7/8" W  x  11 3/4" H
  • Weight: 540lbs

 

 

 

Accessories:

  • Door Overlay: Black, Brushed Nickel
  • Faceplate: Medium (32" x 44"), Large (32" x 50")
  • Faceplate Trim: Black - Medium or Large, Brushed Nickel - Medium or Large
  • Firescreen: Osburn Rigid Firescreen
  • Liner Adapter: Osburn Offset Liner Adapter
  • Air Intake Kit:  5" Fresh Air Intake Kit with 4' of Insulated Flex Pipe

Warranty: 

  • Lifetime: Firebox welds, cast iron door, ceramic glass
  • 7 Years: Baffles, air tubes, heat shields, and internal components
  • 5 Years: Handles, air controls, glass retainers
  • 2 Years: Blower, wiring, switches, and electronics
  • 1 Year: Paint, gaskets, insulation, firebricks
  • Warranty Can Be Void If: Product is improperly installed, misused, modified, not maintained, or not operated according to manufacturer guidelines

Labour

  • Up to 5 years on major components
  • Up to 3 years on controls
  • 1 year on electrical parts

Extras

  • 90-day warranty on replacement parts

 

Education

                    
    Manual            Spec Sheet
 
 

The Osburn 3500 Wood Insert combines exceptional power, efficiency, and safety in a sleek, modern design. Featuring one of the largest viewing areas in its class, it showcases the beauty of a real wood fire while delivering serious heat for your home. Crafted with renowned Canadian engineering, this insert is built for reliable, high-performance heating—even in the harshest winter conditions. Its clean lines allow it to blend seamlessly into a wide range of home styles, while customizable options like door overlays, faceplates, and trims let you tailor the look to match your space perfectly.

 

Features:

  • Efficient Non-Catalytic Performance
    Simple, reliable combustion system delivers strong heat output with fewer maintenance requirements.
  • Heavy-Duty Cast Iron Construction
    Durable cast iron door with optional overlay designs adds both strength and timeless style.
  • Cleaner Glass, Better Fire View
    Built-in air-wash system helps keep the ceramic glass clearer so you can enjoy the flames longer.
  • Powerful Heat Distribution
    Includes a 144 CFM blower to push warm air throughout your space for consistent comfort.
  • Optimized Heat Retention
    Firebox is lined with refractory bricks to improve heat distribution and overall efficiency.
  • Advanced Combustion System
    Stainless-steel secondary-air system enhances burn efficiency while reducing emissions.
  • Built to Last
    Backed by a limited lifetime warranty for long-term peace of mind.
  • EPA 2020 Certified Efficiency
    High-efficiency, clean-burning design meets strict EPA standards for performance and environmental responsibility.

***Wood-burning inserts must only be installed inside an existing masonry fireplace and never in a wooden or combustible structure.

Specifications:

  • Heating coverage area: 1,000 to 2,700 ft²
  • Maximum heat output: 110,000 BTU/h
  • Firebox / combustion chamber overall volume:  3.5 cu ft
  • EPA loading volume: 2.84 cu ft
  • Maximum burn time: up to 10 hours
  • Minimum Fireplace Opening: 26 1/4" H  x  31" W  x  18 3/8" D
  • Overall dimensions: 24-7/8″ H × 30-3/8″ W × 29″ D
  • Door Opening: 9 7/8" H x 19" W
  • Interior Firebox Dimensions: 12 7/8" H  x  22 7/8" W  x  20 1/8" D
  • Glass Surface Dimensions: 18 7/8" W  x  11 3/4" H
  • Weight: 540lbs

 

 

 

Accessories:

  • Door Overlay: Black, Brushed Nickel
  • Faceplate: Medium (32" x 44"), Large (32" x 50")
  • Faceplate Trim: Black - Medium or Large, Brushed Nickel - Medium or Large
  • Firescreen: Osburn Rigid Firescreen
  • Liner Adapter: Osburn Offset Liner Adapter
  • Air Intake Kit:  5" Fresh Air Intake Kit with 4' of Insulated Flex Pipe

Warranty: 

  • Lifetime: Firebox welds, cast iron door, ceramic glass
  • 7 Years: Baffles, air tubes, heat shields, and internal components
  • 5 Years: Handles, air controls, glass retainers
  • 2 Years: Blower, wiring, switches, and electronics
  • 1 Year: Paint, gaskets, insulation, firebricks
  • Warranty Can Be Void If: Product is improperly installed, misused, modified, not maintained, or not operated according to manufacturer guidelines

Labour

  • Up to 5 years on major components
  • Up to 3 years on controls
  • 1 year on electrical parts

Extras

  • 90-day warranty on replacement parts

 

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