Osburn 3500 Wood Insert (OB03510) High-Efficiency Fireplace Insert for Spacious Heating
How does the Osburn 3500 Wood Insert (OB03510) enhance heating efficiency in larger homes?
The Osburn 3500 Wood Insert (OB03510) is engineered to deliver exceptional heating performance for larger spaces. Its expansive 3.5 cubic foot firebox accommodates logs up to 22 inches, providing a maximum heat output of 110,000 BTU/h, effectively heating areas between 1,000 and 2,700 sq. ft. This insert features an air-wash system to maintain clear glass, a heavy-duty cast iron door, and a 130 CFM heat-activated blower for efficient heat distribution. It meets EPA 2020 emissions standards with an average particulate emission rate of 1.32 g/h.
NOTE: Shown with required faceplate, faceplate trim, and door overlay (not included). The faceplate, faceplate trim, and door overlay must be purchased to complete this unit.
Required Accessories
- Black or brushed nickel door overlay
- Faceplate kit Medium (32" x 44") or Large (32" x 50")
- Black or brushed nickel faceplate trims
Also, check the available Osburn 3500 Wood Insert w/ 5.5" x 25' Forever Flex Liner Kit OB03510K.
Why Choose Osburn 3500 Wood Insert
The Osburn 3500 combines robust heating capabilities with high efficiency, making it an ideal choice for homeowners seeking reliable warmth and reduced heating costs in spacious living areas
Key Features
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Fuel type: Dry cordwood (16" recommended)
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Recommended heating area-ft²: 1000- 2,700
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Overall firebox volume-ft³: 3.5
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EPA loading volume-ft³: 2.84
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Maximum burn time: 10 h
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Maximum heat output-dry cordwood: 110,000 BTU/h (32.2 kW)
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Overall heat output rate : 18,100 BTU/h (5.3 kW) to 49,500 BTU/h (14.5 kW)
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Average overall efficiency (dry cordwood) : 71% (HHV) 76% (LHV)
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Optimum overall efficiency: 77%
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Optimum heat transfer efficiency: 76%
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Average particulate emissions rate: 1.32 g/h
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Average CO: 92 g/h
Manuals for OB03510 of Osburn
Specifications for Osburn 3500 Wood Insert OB03510
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Combustion technology: Non-catalytic
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High-efficiency certified appliance: Yes, EPA 2020 approved
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Maximum log length: 22"
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Log positioning: Loading over the width
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Chimney diameter: 6"
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Flue outlet diameter: 6"
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Type of chimney: Liner - ULC-S635, CAN/ULC-S640, UL1777
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Minimum chimney height (feet): 15'
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Baffle type: C-Cast or equivalent
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Approved for a mobile home installation: No
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Shipping Weight: 540lb (245 kg)
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Door type: Single, glass with cast iron frame
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Glass type: Ceramic glass
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Glass surface – dimensions (Width X Height): 18 7/8" X 11 3/4"
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Glass air-wash system: Yes
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Premium Quality Blower Included (CFM): 144
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Overall dimension: (Height) 24 7/8" (Width) 30 3/8" (Depth) 29"
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Door opening – dimension: (Height) 8 3/4" (Width) 17 1/2"
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Firebox – dimension: (Height) 12 7/8" (Width) 22 7/8" (Depth) 20 1/8"
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Firebox lined with refractory bricks for better heat distribution: Yes
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Stainless-steel secondary-air system improving gas combustion: Yes
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Steel thickness – body: 3/16"
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Steel thickness – top: 5/16"
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Fireplace opening – minimum: (Height) 26 1/4" (Height) 31" (Height) 18 3/8"
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USA standard (emissions): EPA
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Canadian Standard (emissions): CSA B415.1-10
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USA standard (safety): UL 1482, UL 737
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Canadian standard (safety): ULC S628
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Tested and listed as per applicable standards: By an accredited laboratory (CAN/USA)
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Warranty: Limited lifetime
Minimum clearances to combustibles
(Data expressed in inches. 1 inch = 25.4 mm)
Canada
- Clearance - top (measured from the platform on which the appliance is installed) - 84"
- Clearance - Combustible side mantle to unit - 9"
- Clearance - Combustible top mantle to unit - 27"
- Clearance - Combustible side wall to unit - 19"
- Clearance - from the top of the unit to the shelf - 27"
United States
- Clearance - top (measured from the platform on which the appliance is installed) - 84"
- Clearance - Combustible side mantle to unit - 9"
- Clearance - Combustible top mantle to unit - 27"
- Clearance - Combustible side wall to unit - 16"
- Clearance - from the top of the insert to the shelf - 27"
The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual, catalogs, flyers, magazines, and/or websites).
Note: Some appliances have been tested with a low ceiling. Before setting up your unit, refer to the installation manual.
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