Osburn 1700 Wood-Burning Fireplace Insert
Osburn 1700 Wood Insert OB01705 – EPA 2020 Wood-Burning Fireplace Insert
The Osburn 1700 Wood Insert OB01705 is a compact non-catalytic wood-burning fireplace insert designed to convert an existing masonry fireplace into a controlled residential zone-heating appliance. It is recommended for spaces from 500 to 1,800 sq. ft., delivers up to 65,000 BTU/h with dry cordwood, offers a 1.9 cu. ft. nominal firebox, accepts logs up to 18 inches, and includes a blower rated at up to 144 CFM.
Model
OB01705
Heating Area
500–1,800 sq. ft.
Max Output
65,000 BTU/h
Firebox
1.9 cu. ft.
Max Burn Time
6 Hours
Max Log Length
18"
Blower
Up to 144 CFM
EPA Emissions
1.26 g/h
Faceplate Extension Included
A faceplate extension is included with the Osburn 1700 for installation in most hearths. The final insert configuration still requires the correct faceplate kit, faceplate trim, and door overlay selections.
Compact Wood Heating for Existing Masonry Fireplaces
The Osburn 1700 is designed for homeowners who want to convert an existing masonry fireplace into a more controlled and efficient wood-burning zone heater without moving to a larger insert platform.
Its non-catalytic combustion system combines a C-Cast baffle, stainless-steel secondary-air tubes, refractory-lined firebox, ceramic-glass door, air-wash system, and included 144 CFM blower.
The insert is intended primarily to heat the room where it is installed, with connected spaces receiving heat to a lesser degree.
EPA 2020 compliant: The supplied product information lists an average particulate emissions rate of 1.26 g/h.
Osburn 1700 OB01705 at a Glance
Product Type
Wood-Burning Fireplace Insert
Heating Area
500–1,800 sq. ft.
Maximum Output
65,000 BTU/h
Firebox Volume
1.9 cu. ft.
Maximum Burn Time
6 Hours
Blower
Included, Up to 144 CFM
Is the Osburn 1700 Right for Your Fireplace?
Best For
- Existing masonry fireplaces suitable for a wood-burning insert.
- Homes needing recommended zone heating from 500–1,800 sq. ft.
- Buyers wanting a compact 1.9 cu. ft. firebox.
- Installations using a continuous 6-inch stainless-steel chimney liner.
- Users wanting logs up to 18 inches long.
- Buyers wanting an included blower up to 144 CFM.
- Homeowners wanting non-catalytic EPA-certified combustion.
- Projects where the included faceplate extension is useful.
Consider Another Product If
- You need a mobile-home-approved wood insert.
- You plan to install the appliance in a bedroom.
- Your masonry fireplace does not meet the minimum opening dimensions.
- Your chimney cannot support a continuous 6-inch listed liner.
- You cannot meet required clearances or floor protection.
- You want a larger firebox or longer burn-cycle platform.
Heating Performance & Efficiency
| Recommended Heating Area |
500–1,800 sq. ft. |
| Maximum Heat Output |
65,000 BTU/h (19 kW) |
| Overall Heat Output Rate |
15,650–23,300 BTU/h (4.6–6.83 kW) |
| Maximum Burn Time |
6 Hours |
| Average Overall Efficiency – HHV |
70% |
| Average Overall Efficiency – LHV |
75% |
| Optimum Overall Efficiency |
78% |
| Average Particulate Emissions |
1.26 g/h |
| Average CO |
58 g/h |
Maximum output vs. tested heat-output range: The 65,000 BTU/h maximum dry-cordwood output and the 15,650–23,300 BTU/h overall heat-output range are separate manufacturer performance measurements.
Key Features
Non-Catalytic Combustion
Uses secondary combustion without a catalytic combustor.
65,000 BTU/h Maximum Output
Maximum stated dry-cordwood heat output under the specified conditions.
1.9 cu. ft. Firebox
Compact firebox capacity suited to residential zone-heating applications.
18" Maximum Log Length
Supports logs up to 18 inches in an east-west orientation.
6-Hour Maximum Burn Time
Actual burn time varies with fuel, moisture, load size, chimney draft, and heat demand.
144 CFM Blower
Included blower helps move warm air through the heat exchanger and into the room.
Automatic Heat Sensor
Blower can start automatically after the insert reaches operating temperature and stop after cooling.
Ceramic Glass
Single viewing door with a cast-iron frame.
Glass Air-Wash System
Helps reduce deposits on the glass during proper operation.
Firebox & Fuel Requirements
| Fuel Type |
Dry Cordwood |
| Nominal Firebox Volume |
1.9 cu. ft. |
| Maximum Log Length |
18" |
| Common Firewood Length |
Approximately 16" |
| Log Orientation |
East-West / Across the Width |
| Recommended Moisture Content |
Approximately 15%–20% |
| Baffle Material |
C-Cast |
| Secondary-Air Tubes |
Four Stainless-Steel Tubes |
| Firebox Lining |
Refractory Firebrick |
Burn only approved fuel: Do not burn garbage, treated wood, construction debris, plastics, petroleum products, unseasoned wood, or other prohibited materials identified in the manufacturer's instructions.
Overall Dimensions
| Overall Width |
27 1/8" |
| Overall Height |
21 1/4" |
| Overall Depth |
22 3/8" |
Firebox & Door Dimensions
| Combustion Chamber Width |
19 5/8" |
| Combustion Chamber Height |
11 7/8" |
| Combustion Chamber Depth |
13 1/2" |
| Door Opening Width |
17 1/4" |
| Door Opening Height |
8 3/4" |
Minimum Masonry Fireplace Opening
Before ordering, verify that the existing masonry fireplace meets the minimum opening dimensions for the OB01705.
| Minimum Width |
27 1/2" |
| Minimum Height |
21 1/2" |
| Minimum Depth |
12 7/8" |
Fresh-air intake note: If a fresh-air intake is required, the installation manual recommends adding at least 4 inches to the minimum fireplace-opening width.
Compatibility involves more than opening dimensions: Chimney condition, liner requirements, floor protection, combustible clearances, hearth height, and final faceplate configuration must also be verified.
Chimney & Venting Requirements
Liner Standards
ULC S635, CAN/ULC-S640, UL 1777
Minimum Chimney Height
15'
Continuous Liner
Required from insert to chimney top
Shared Flue
Not Permitted
Dedicated chimney connection required: The insert must not be connected to a chimney flue serving another appliance.
Required Accessories & Faceplate Options
Faceplate Kit
- Regular – 29" × 44"
- Large – 32" × 50"
Included component: A faceplate extension is included with the insert.
Blower Operation
The included blower is rated at up to 144 CFM and is positioned beneath the ash lip to move air through the insert's heat exchanger.
Variable Speed
A rheostat provides high-to-low blower adjustment.
Automatic Heat Sensing
When switched on, the blower starts automatically after sufficient insert temperature is reached and stops after the appliance cools.
Minimum U.S. Clearances to Combustibles
| Adjacent Combustible Side Wall to Unit |
16" |
| Combustible Side Surround / Mantel to Unit |
9" |
| Combustible Top Surround / Mantel to Unit |
27" |
| Top of Insert to Combustible Mantel Shelf |
27" |
| Top Clearance from Installation Platform |
84" |
| Maximum Mantel Shelf Depth |
12" when installed at least 27" above insert |
Certification label priority: The certification label attached to the appliance overrides clearance information published in manuals, catalogs, flyers, magazines, or websites.
Floor Protection Requirements
Front Protection – United States
Non-combustible floor protection must extend at least 16 inches in front of the door opening.
Side Protection
Floor protection must extend at least 8 inches to the sides as specified by the manufacturer.
Raised-hearth conditions matter: When the masonry hearth is less than 4 inches above a combustible floor, additional thermal-protection requirements apply.
Installation & Safety Considerations
Masonry Fireplace Required
The insert is designed for installation in a suitable masonry fireplace.
Professional Installation Recommended
The manufacturer highly recommends qualified professional installation and service.
Mobile Home
Not approved.
Bedroom Installation
Not intended.
Smoke & CO Detection
Smoke and carbon-monoxide detectors should be installed in the home according to manufacturer guidance.
Fire Extinguisher
A fire extinguisher should be available and its location known to household members.
Complete Osburn 1700 OB01705 Specifications
| Brand |
Osburn |
| Model |
OB01705 |
| Product Type |
Wood-Burning Fireplace Insert |
| Fuel Type |
Dry Cordwood |
| Recommended Heating Area |
500–1,800 sq. ft. |
| Nominal Firebox Volume |
1.9 cu. ft. |
| Maximum Burn Time |
6 Hours |
| Maximum Heat Output – Dry Cordwood |
65,000 BTU/h (19 kW) |
| Overall Heat Output Rate |
15,650–23,300 BTU/h (4.6–6.83 kW) |
| Average Overall Efficiency – HHV |
70% |
| Average Overall Efficiency – LHV |
75% |
| Optimum Overall Efficiency |
78% |
| Average Particulate Emissions Rate |
1.26 g/h |
| Average CO |
58 g/h |
| Combustion Technology |
Non-Catalytic |
| Maximum Log Length |
18" |
| Log Orientation |
East-West / Across the Width |
| Recommended Fuel Moisture |
15%–20% |
| Flue Outlet Diameter |
6" |
| Recommended Connector / Liner Diameter |
6" |
| Chimney / Liner Standards |
ULC S635, CAN/ULC-S640, UL 1777 |
| Minimum Chimney Height |
15' |
| Continuous Chimney Liner |
Required |
| Baffle Material |
C-Cast |
| Mobile Home Approved |
No |
| Bedroom Installation |
Not Intended |
| Door Type |
Single Glass Door with Cast-Iron Frame |
| Glass Type |
Ceramic Glass |
| Glass Air-Wash System |
Yes |
| Blower |
Included, Up to 144 CFM |
| Blower Control |
Variable Speed with Automatic Heat Sensor |
| Overall Width |
27 1/8" |
| Overall Height |
21 1/4" |
| Overall Depth |
22 3/8" |
| Door Opening |
17 1/4" W × 8 3/4" H |
| Combustion Chamber |
19 5/8" W × 11 7/8" H × 13 1/2" D |
| Minimum Masonry Opening |
27 1/2" W × 21 1/2" H × 12 7/8" D |
| Refractory Firebrick |
Yes |
| Secondary-Air Tubes |
Stainless Steel |
| Steel Thickness – Body |
3/16" |
| Steel Thickness – Top |
5/16" |
| Faceplate Extension |
Included |
| Required Door Overlay |
Black or Brushed Nickel |
| Faceplate Options |
Regular 29" × 44" or Large 32" × 50" |
| Faceplate Trim Options |
Black or Brushed Nickel |
| Shipping Weight |
361 lb (164 kg) |
| USA Emissions Standard |
EPA |
| Canadian Emissions Standard |
CSA B415.1-10 |
| USA Safety Standards |
UL 1482, UL 737 |
| Canadian Safety Standard |
ULC S628 |
| Warranty |
Osburn Limited Lifetime Warranty |
Flame Authority Expert Recommendation
Choose the Osburn 1700 OB01705 when you want a compact, EPA-certified wood-burning insert for a compatible existing masonry fireplace and need a recommended heating range of 500–1,800 sq. ft..
Its 65,000 BTU/h maximum output, 1.9 cu. ft. firebox, 18" log capacity, 6-hour maximum burn time, 1.26 g/h particulate emissions rate, ceramic-glass door, refractory firebrick, stainless-steel secondary-air tubes, automatic heat-sensing 144 CFM blower, and included faceplate extension make it a practical option for qualifying residential installations.
The most important planning step is verifying the complete fireplace and chimney system. Confirm the 27 1/2" × 21 1/2" × 12 7/8" minimum masonry opening, 6" continuous liner, 15' minimum chimney height, required clearances, floor protection, door overlay, faceplate size, faceplate trim, and fresh-air requirements if applicable before ordering.
Also Available with Liner Kit
Official Manufacturer Resources
Installation & Owner's Manual
Manufacturer installation, operation, chimney, liner, fireplace-opening, clearance, floor-protection, maintenance, safety, and blower guidance.
Osburn 1700 Specification Sheet
Manufacturer heating, dimensions, emissions, combustion, construction, firebox, blower, and technical specifications.
Osburn 1700 OB01705 FAQs
How much space can the Osburn 1700 Wood Insert heat?
The Osburn 1700 has a manufacturer-recommended heating area of 500 to 1,800 sq. ft. Actual performance depends on climate, home layout, insulation, chimney draft, fuel quality, heat loss, and appliance location.
How many BTUs does the Osburn 1700 produce?
The Osburn 1700 has a listed maximum heat output of 65,000 BTU/h (19 kW) with dry cordwood. The manufacturer separately lists an overall heat-output range of 15,650–23,300 BTU/h.
What size fireplace opening does the Osburn 1700 require?
The minimum masonry fireplace opening is 27 1/2" wide × 21 1/2" high × 12 7/8" deep.
Does a fresh-air intake affect the minimum fireplace opening?
Yes. If a fresh-air intake is required, the installation manual recommends adding at least 4 inches to the minimum fireplace-opening width.
What size logs fit in the Osburn 1700?
The Osburn 1700 accepts logs up to 18 inches long in an east-west orientation. Approximately 16-inch cordwood is a common standard length.
How long can the Osburn 1700 burn?
The manufacturer lists a maximum burn time of 6 hours. Actual duration varies with wood species, moisture content, load size, chimney draft, climate, and heating demand.
Does the Osburn 1700 include a blower?
Yes. It includes a blower rated at up to 144 CFM with adjustable speed and automatic heat-sensing operation.
Is the Osburn 1700 catalytic or non-catalytic?
The Osburn 1700 uses non-catalytic combustion technology with stainless-steel secondary-air tubes and a C-Cast baffle.
Is the Osburn 1700 EPA 2020 compliant?
Yes. The Osburn 1700 is EPA certified for the 2020 cordwood standard and has a listed average particulate emissions rate of 1.26 g/h.
What efficiency does the Osburn 1700 have?
The supplied specifications list 70% average overall efficiency HHV, 75% LHV, and 78% optimum overall efficiency.
What size chimney liner does the Osburn 1700 require?
The standard installation uses a 6-inch listed stainless-steel chimney liner extending continuously from the insert to the top of the chimney.
Can the Osburn 1700 share a chimney flue with another appliance?
No. The supplied installation information states that the insert must not be connected to a chimney flue serving another appliance.
What is the minimum chimney height?
The supplied product information lists a 15-foot minimum chimney height.
Can the Osburn 1700 be installed in a mobile home?
No. The OB01705 is not approved for mobile or manufactured-home installation.
Can the Osburn 1700 be installed in a bedroom?
No. The supplied information states that the insert is not intended for bedroom installation.
What accessories are required for the Osburn 1700?
The current product configuration requires a black or brushed-nickel door overlay, a Regular 29" × 44" or Large 32" × 50" faceplate kit, and compatible black or brushed-nickel faceplate trim.
Does the Osburn 1700 include a faceplate extension?
Yes. A faceplate extension is included with the unit for applicable hearth configurations.
What floor protection does the Osburn 1700 require?
In the United States, non-combustible floor protection must extend at least 16 inches in front of the door opening and 8 inches to the sides, subject to the complete manufacturer requirements for the final hearth configuration.
What are the overall dimensions of the Osburn 1700?
The insert measures approximately 27 1/8" wide × 21 1/4" high × 22 3/8" deep.
What type of wood should be burned in the Osburn 1700?
Use seasoned natural firewood, ideally at approximately 15%–20% moisture content. Do not burn prohibited fuels identified in the owner's manual.
Does the Osburn 1700 require professional installation?
The manufacturer highly recommends professional installation and service by appropriately qualified wood-heating professionals, along with compliance with applicable local building, chimney, fire, and inspection requirements.
What warranty comes with the Osburn 1700?
The Osburn 1700 is covered by the Osburn Limited Lifetime Warranty, subject to the manufacturer's component-specific coverage periods, terms, exclusions, installation requirements, and proof-of-purchase requirements.
Before You Order
Confirm Before Purchase
- You specifically need the Osburn 1700 OB01705.
- Your masonry fireplace meets the 27 1/2" W × 21 1/2" H × 12 7/8" D minimum opening.
- Your chimney can accommodate a continuous 6-inch listed liner.
- Your installation can meet the 15-foot minimum chimney-height requirement.
- You can maintain the required combustible clearances.
- You can provide the required non-combustible floor protection.
- You have selected the required door overlay.
- You have selected the correct Regular or Large faceplate kit.
- You have selected the correct faceplate trim.
- You understand that the faceplate extension is included.
- You understand that mobile-home and bedroom installation are not supported.
Do Not Assume
- That fireplace-opening dimensions alone establish full compatibility.
- That the insert can use a partial chimney liner.
- That it can share a chimney flue with another appliance.
- That the 65,000 BTU maximum figure is the same as the tested overall heat-output range.
- That the insert is mobile-home approved.
- That bedroom installation is supported.
- That all faceplate sizes fit every hearth.
- That the included faceplate extension replaces the required faceplate kit.
- That website clearance data override the appliance certification label.
Final planning check: Use the Osburn 1700 Installation & Owner's Manual, Specification Sheet, and appliance certification label to verify fireplace fit, chimney liner, clearances, hearth protection, finish components, blower operation, fresh-air requirements, and final installation before ordering.
