Osburn 2000-I Wood Insert

Right buyer

Owners of a working masonry fireplace who want to convert an inefficient open hearth into a serious primary heat source — up to 2,100 sq ft of zone heating capability with a 2.4 ft³ firebox, 20-inch log capacity, and an 8-hour maximum burn cycle. Reasonable insulation, access to seasoned hardwood at 15–20% moisture, and an existing masonry fireplace that meets the minimum opening dimensions (23 3/8" H × 28 7/8" W × 15 3/4" D per manual) are the basic requirements.

Buyers with a medium-depth masonry opening that won't take the deeper Inspire 2000-I. The 2000-I's 15 3/4" minimum depth is meaningfully shallower than the Inspire's 20 3/4" requirement — for a buyer who wants medium-large firebox capability and the masonry depth is tight, this is the right tool. The trade-off is a less powerful blower (144 CFM vs the Inspire's 176 CFM).

Buyers heating 1,400–1,900 sq ft as primary winter heat in moderate climates, or 1,200–1,500 sq ft in cold climates and older homes. The 2000-I sits in the upper-middle of the Osburn insert line — meaningfully more firebox than the 1700-I, with a different aesthetic and depth profile from the larger 3500-I or Matrix 2700.

Buyers who want the traditional Osburn aesthetic with configurable trim. The cast-iron arched door, glass viewing window, and selectable faceplate trim (Black or Brushed Nickel) plus optional steel door overlay give the front face real detail — not as decorative as the Matrix line, not as minimal as the Inspire. The 2000-I is the most-configurable insert in the Osburn line on the front face.

Buyers with a high mantel or large surround. The 2000-I's 9" minimum side-mantel and 27" top-mantel clearances are tighter than the smaller 1700-I, which means it can sit closer to a tall combustible mantel than smaller siblings. Verify your specific install with a certified installer before committing.

Wrong buyer

Not for buyers without an existing code-compliant masonry fireplace. Wood inserts must be installed inside a lined masonry fireplace with a continuous stainless-steel chimney liner running the full height. This insert requires a substantial opening (23 3/8" H × 28 7/8" W × 15 3/4" D per manual). Not approved for factory-built (prefab) metal fireplaces, mobile homes, alcoves, or freestanding installation.

Not for buyers who want the most powerful blower in the line. The 2000-I uses the 144 CFM blower shared with the 1700-I and 3500-I — not the 176 CFM unit found in the Matrix 2700 and Inspire 2000-I. For maximum heat-into-the-room performance, those models will move more air.

Not for buyers heating under 1,200 sq ft. The 2.4 ft³ firebox will overheat a smaller space and force you to run it inefficiently. For smaller spaces, step down to the Osburn 1700-I.

Not for buyers expecting 10+ hour overnight burns. The 8-hour manufacturer maximum is achievable on a packed load of dense hardwood with the air shut down hard, but useful heat from a packed load is realistically 6–7 hours. For longer burns, consider a catalytic insert.

Not for buyers who want a modern, picture-window aesthetic. The 2000-I is intentionally traditional — cast-iron arched door, framed glass, configurable cast-iron faceplate. Buyers wanting the flush, contemporary look should compare against the Inspire 2000-I.

The 2000-I is approved only for installation inside an existing code-compliant masonry fireplace with a continuous stainless-steel chimney liner. It is not approved for installation in factory-built (prefab) metal fireplaces, in mobile or manufactured homes, in alcoves, or as a freestanding unit. The masonry fireplace and chimney must be inspected before installation for cracks, loose mortar, creosote, blockage, or other signs of deterioration.

Minimum masonry opening

If a fresh-air intake is being installed, add at least 4 inches to the minimum width. Plan for a small installation margin above the insert to seat the liner adapter — an opening exactly at the minimum will be a tight install. Measure carefully before ordering. The 15 3/4" minimum depth is the 2000-I's positioning advantage over the deeper-required inserts in the Osburn line.

Faceplate options

The 2000-I requires one faceplate size selection at order, with optional trim and door-overlay configurations:

Each faceplate size can be ordered with an optional Black or Brushed Nickel trim package (matching faceplate dimensions) — this is the configurable decorative frame that sits around the appliance face. Plus an optional Black or Brushed Nickel steel door overlay across the door. All configurable selections are made at order and are not field-swappable. Choose the configuration that matches the masonry opening and the look you want. For larger openings beyond the Large faceplate's 32" × 50" coverage, an optional 32" × 50" cuttable faceplate (SBI AC01357, 18 GA) extends the cover area — the cuttable can be trimmed to contour an arched fireplace or to minimize visible flashing, ordered as a separate accessory.

Clearances to combustibles

The certification label on the back of the insert always overrides clearance figures published elsewhere. An optional heat shield (SBI AC01317, 7 3/16" × 26") is available for surround/shelf applications where additional protection is needed.

Floor protection

Floor protection requirements depend on whether the existing masonry hearth is raised above the surrounding combustible floor and whether it extends sufficiently in front of the appliance. The manual requires a non-combustible floor protector extending at least 16 inches in front of the unit in the USA or 18 inches in Canada, measured from the door opening. If the masonry hearth is level with or only slightly raised above the surrounding combustible floor, an R-value floor protector may be required per the manual's floor-protection worksheet. The manual includes a thermal-resistance lookup table for common floor protection materials (brick, cement board, ceramic tile, marble) to calculate the required R-value combination. Tile alone is not sufficient — the manual requires a continuous non-combustible sheet beneath any tile installation. Final hearth protection must be calculated from the manual's floor-protection worksheet and approved by the installer/AHJ.

Chimney and liner

The 2000-I requires a continuous 6-inch stainless-steel chimney liner extending from the insert flue collar to the top of the chimney. The liner must conform to ULC S635, CAN/ULC-S640 (Canada) or UL 1777 (USA) and be rated for solid fuel. The minimum liner height is 12 feet, subject to installer verification, certification label, draft conditions, and local code. The chimney must extend at least 3 feet above the highest point of contact with the roof and at least 2 feet above any roof line or obstacle within 10 feet horizontally.

The 2000-I performs best with a 6-inch stainless-steel chimney liner. In the USA, use a 6-inch liner listed to UL 1777. In Canada only, connection to a chimney liner of at least 5 inches may be permitted if it properly vents combustion gases, the total masonry chimney height is greater than 20 feet, and the application is verified and authorized by a qualified installer. The insert is not approved for a positive flue connection to clay tile — a continuous stainless liner is required.

If the existing fireplace's throat damper is to remain, it must be locked open to clear the liner; otherwise the damper plate must be removed. A sheet-metal block-off plate sealed at the damper level (or, in Canada per CSA B365, mineral wool packing around the liner) is recommended at the throat to reduce cold-air backdraft and to allow the insert to deliver rated performance — without it, jacket-recovered heat is lost into the smoke chamber. An insulated liner (or pre-insulated liner with a wrap) improves draft and reduces creosote, and is required by code in some jurisdictions for clearance reasons.

Outside air

An optional 5-inch fresh-air intake kit is available for code jurisdictions requiring outside combustion air or for tight new-construction homes with mechanical ventilation. In conventional homes the manual identifies room air as the safest and most reliable supply for combustion; almost all houses have enough natural leakage to provide what the insert needs. A smoke detector and carbon monoxide detector are required in the room where the insert is installed.

Code compliance

Code compliance for any specific installation is determined by the local Authority Having Jurisdiction. Manufacturer listings cover what the insert is approved for; the AHJ approves what is permitted at your address. A WETT (Canada), NFI, or CSIA (USA) certified installer is strongly recommended and frequently required by code, permit, or insurance. In Canada the CSA B365 standard applies; in the USA, ANSI NFPA 211 applies. Confirm local requirements before purchasing — particularly in EPA non-attainment counties and in HOA jurisdictions where new wood-burning installs may be restricted.

California Proposition 65

This product can expose you to chemicals including carbon monoxide, which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov.

Ships with the insert

• Osburn 2000-I wood insert (OB02016) with welded carbon-steel firebox and cast-iron arched glazed door
• Configured at order with required faceplate selection (Regular 29" × 44" or Large 32" × 50") — see "Where it can go" for the options
• 144 CFM premium-quality variable-speed blower with rheostat speed control and thermodisc auto-on
• C-Cast baffle and stainless-steel secondary-air tube assembly
• Moulded refractory bricks lining
• Adjustable threaded legs
• Removable air-control handle
• Liner fixation brackets and hardware
• Owner's manual and product documentation

Sold separately

• 6-inch continuous stainless-steel chimney liner kit (UL 1777, CAN/ULC-S635, or CAN/ULC-S640) — required for installation, sized to the chimney height
• Hearth extension or floor protector sized per manual specifications, extending at least 16 inches in front of the unit in the USA, 18 inches in Canada
• Sheet-metal block-off plate, high-temp silicone, and mineral wool insulation — effectively required in practice for the insert to deliver rated performance
• Optional faceplate trim package in Black or Brushed Nickel — configured at order to match the chosen faceplate size
• Optional steel door overlay in Black or Brushed Nickel — configured at order
• Optional 32" × 50" cuttable faceplate, 18 GA (SBI AC01357) — for masonry openings larger than the Large faceplate covers
• Optional 7 3/16" × 26" heat shield for surround/shelf (SBI AC01317) — for installations requiring additional surround protection
• Optional 5-inch fresh-air intake kit (SBI AC01298) — for code jurisdictions requiring outside combustion air or for tight new-construction homes
• Optional 5-inch × 4' insulated flex pipe for fresh-air intake (SBI AC02090) — HVAC type, ULC S110 or UL 181 class 0 or class 1
• Optional 5-inch fresh-air intake register with airtight damper (SBI AC01349) — do not close while in use
• Optional rigid firescreen (SBI AC01315) — for occasional attended fire viewing only where permitted by local code and only when used exactly as instructed in the fire screen manual; never leave the insert unattended when used with a fire screen
• Optional liner hook-up system (SBI AC02006) — simplifies liner-to-flue-collar connection
• Optional offset liner adapter (SBI AC01214) — for installations where the chimney throat geometry requires offset connection
• Optional tempered glass hearth pad 10mm 18" × 50" (SBI AC02760)
• Pin-type wood moisture meter — not optional in practice
• Flue thermometer — strongly recommended for insert installations since stove-top temperature isn't accessible
• Installation by an authorized qualified technician (WETT, NFI, or CSIA certified) — required for warranty coverage and often required by code, permit, or insurance

The 75,000 BTU/hr maximum is a peak rating, transient, achieved on dry cordwood at high loading density and short reload intervals. It is real, but it is a peak rating, not the average output across a full burn cycle of normal operation. The figure that matters for daily life is the sustained output across a full burn cycle, which lands in the 14,200–44,500 BTU/hr band per the CSA B415.1-10 stack-loss method — a wide range covering shoulder-season heating on the low end and strong sustained output for cold-snap heating on the high end.

A realistic burn cycle from a packed load of well-seasoned hardwood produces a 45-minute warm-up, 2–3 hours of strong sustained heat once the firebox and surrounding masonry come up to temperature, then a gradual decline over the next 3–4 hours with a coal bed remaining. Total useful heat from one full pack is realistically 6–7 hours, occasionally approaching the 8-hour manufacturer maximum with dense hardwood, mild weather, and a packed coal bed. Owner reports describe successful heating across 1,800–2,400 sq ft homes, with the highest-end results typically requiring well-insulated, open-plan layouts.

The masonry around the insert acts as a thermal mass. Once the surrounding brick or stone is up to temperature, it continues radiating heat into the room well after the active fire has died down. This is one of the underappreciated benefits of an insert versus a freestanding stove — the masonry stores and releases heat on its own cycle. The first hour from a cold start is the slowest because that mass has to come up to temperature; once it's hot, response time is faster.

The 144 CFM variable-speed blower is what gets the heat into the room. Because most of the insert's firebox sits inside the masonry cavity, the radiant heat that would otherwise reach the room from a freestanding stove is partly absorbed by the surrounding brick. The convection jacket around the firebox captures that heat and the blower pushes it out into the room. The rheostat allows speed adjustment, and the thermodisc handles automatic on/off based on insert temperature. The 144 CFM rating is the same blower used in the smaller 1700-I and the larger 3500-I — meaningfully quieter at typical settings than the 176 CFM unit in the Matrix 2700 and Inspire 2000-I, but with less peak airflow.

Multiple owner reports cite occasional thermodisc activation issues — the blower failing to engage in AUTO when the insert reaches operating temperature, or running constantly regardless of switch position. The issue is usually improper thermodisc seating against the insert body during installation; have the installer verify the sensor mounting before sign-off and test all switch positions before the installer leaves.

Air-wash glass stays largely clear during proper hot burns at moderate-to-high air settings. At low burn rates with marginally seasoned wood, the glass will tar. This is universal to non-catalytic inserts, not specific to Osburn. The 17 1/8" × 10 1/4" glass is sized in proportion to the firebox — narrower than the Matrix 2700's wide-format glass, taller than the Inspire's horizontal picture window.

Power-failure operation: the insert continues to burn safely without electricity — only the blower stops. Heat distribution drops noticeably without the blower because the masonry cavity absorbs most of the firebox radiation. Plan accordingly if you're buying this insert specifically as a power-outage heat source.

Less powerful blower than newer Osburn inserts. The 2000-I uses the 144 CFM blower shared with the 1700-I and 3500-I — not the 176 CFM unit in the Matrix 2700 and Inspire 2000-I. For an insert where most of the firebox sits inside the masonry cavity, blower CFM is what gets the heat into the room. The 144 CFM unit is quieter at typical settings but moves less air. If maximum heat delivery is the priority, the Matrix 2700 (deeper masonry opening) or Inspire 2000-I (deeper masonry opening) deliver more.

Shallow-depth advantage. The 15 3/4" minimum depth is meaningfully shallower than the Inspire 2000-I (20 3/4") and the Matrix 2700 (22 1/8") — the 2000-I fits medium-depth masonry openings the deeper-required inserts can't. For buyers with a shallow-but-wide existing fireplace, this is the most-likely-to-fit medium-large insert in the Osburn line.

Substantial masonry opening required overall. The 23 3/8" H × 28 7/8" W footprint is still a real requirement — narrower fireplaces won't accept it. Measure carefully before ordering.

Multiple owner reports of blower thermodisc issues. Some owners report the blower failing to engage automatically or running constantly regardless of switch position. The issue is typically improper thermodisc seating during installation. Have the installer verify the sensor mounting before sign-off and test all switch positions before they leave.

Emissions at the upper end of EPA compliance. The 2.3 g/hr particulate emissions rate is well within the EPA 2020 cordwood limit (2.5 g/hr) but higher than the 1.2 g/hr Matrix 2700 or the 1.5 g/hr Matrix 1900. In EPA non-attainment counties or jurisdictions with stricter local emission rules, this is worth comparing against the Matrix line.

8-hour maximum burn is large-class, not long-burn class. A 2.4 ft³ non-cat insert gives you meaningful primary-heat capability across 1,400–1,900 sq ft, with realistic 6–7 hour burn cycles. If you want true 10+ hour overnight burns, consider a catalytic insert with a real low-output mode.

The 2,100 sq ft figure is aspirational. The most consistent owner regret across medium-large inserts is buying for the high end of the manufacturer's heating range. Several 2000-I owners successfully heat 1,800–2,400 sq ft homes, but those results require well-insulated, open-plan layouts; supplemental heat may still be needed in the coldest weather.

The blower is essential, not optional. Unlike a freestanding stove where the blower meaningfully improves heat distribution, on an insert the blower is what gets the heat into the room at all. Most of the firebox sits inside the masonry cavity, which absorbs radiant heat. The insert will run safely without the blower (useful in a power outage), but day-to-day heat into the room depends on the blower being on and working.

432 lb shipping weight is heavy. Plan for three-person handling minimum and verify the installation route — stairs, narrow doorways, and tight masonry access make the install meaningfully harder than for smaller inserts.

Liner, block-off plate, and labor are not in the appliance price. The insert is the appliance; the chimney liner, the block-off plate, the insulation wrap, and the professional installation are separate purchases that need to be planned for. Older or taller chimneys, offset flues, and damper-frame removal add to install complexity. Skipping the liner, the block-off plate, or the insulation wrap saves money up front and costs measurable performance and creosote durability after.

Configuration is a one-time decision. Faceplate size (Regular or Large), trim package (Black or Brushed Nickel), and steel door overlay (Black or Brushed Nickel) are all configured at order — not field-swappable. Choose carefully based on the masonry opening and the look you want.

Shipping damage shows up in reviews. Multiple owner reports cite broken trim, scratches, or wrong-size overlays on arrival. SBI's parts network handles replacements but the experience can be frustrating. Inspect the shipment thoroughly on delivery before signing off — document any damage with photos before the installer leaves.

Wood quality is not negotiable. The most common "the insert doesn't heat" complaint comes from owners running marginally seasoned wood. Secondary combustion works best with dry, properly seasoned fuel, ideally around 15–20% moisture. A pin-type moisture meter is the single best accessory for this insert.

First burns. The first three to six fires release paint VOCs as the high-temperature stove paint cures. The smell can be strong; ventilate the room well and avoid prolonged exposure during cure-in. Run the insert hot and expect the smell to disappear permanently after the cure-in.

Lighting. Per the manual, the recommended method is the EPA loading procedure for cleanest combustion: place two small pieces in the bottom in a reverse-V shape, two medium-size pieces in an east-west orientation in the back over the reverse V, and a big piece in the front over the reverse V. Leave air space between pieces. Light, leave the door slightly ajar for about 5 minutes during light-off; close once the fire is well established. The manual also describes alternative methods (conventional bottom-up, top-down, two-parallel-logs).

Air control. Single-lever, located below the ash shelf. Push the handle to one position for HIGH (full air) and the opposite position for LOW (minimal air). Full open at light-off; gradually closed only after the load is fully engaged and stable secondary flames are established. Closing too fast and the fire smolders. A flue thermometer is strongly recommended; without one, you are guessing at draft, burn rate, and overfire risk.

Blower operation. The 144 CFM variable-speed blower has a rheostat for speed adjustment plus a thermodisc-controlled AUTO mode that starts the blower when the insert reaches operating temperature and stops it when it cools down. Set the rheostat and the sensor handles the rest. Allow the insert to reach operating temperature (approximately one hour from cold start) before relying on the blower. Per the manual, turning the blower on too early during start-up pulls heat away from the firebox and slows the build-up to clean combustion.

Reload cadence. 3–4 hours between reloads in active heating use; up to 7 hours for a final overnight pack with the air shut hard. Rake remaining charcoal toward the front of the firebox before loading — this concentrates the coals near where most of the combustion air enters and helps ignite the new load. Place the new load on and at the back of the embers. Open the air for a minute or two before opening the door, open the door slowly to avoid smoke rollout, load, close the door, and run the air open until the load is fully engaged before reducing gradually. Turn the blower OFF before opening the door fully to reduce ash disturbance.

Burn in cycles, not single-log feeds. The manual is explicit: do not attempt to produce steady heat output by placing a single log on the fire at regular intervals. Always place at least three (preferably more) pieces on the fire at a time so the heat radiated from one piece helps ignite the pieces next to it. Each load should provide several hours of heating.

Carbon monoxide watch. Per the manual, if the firebox no longer shows flame but still contains unburned logs, check outside for smoke from the chimney. Smoke without flame means the fire is air-starved and CO levels are rising. Open the door slightly, move the logs with a poker, create a passage for air by making a trench in the ember bed, and add small kindling-size pieces to restart combustion.

Ash management. The 2000-I uses a hollow-bottom firebox; ash is scooped manually from the front. Empty ash every 2–3 days during full-time heating. The best time to remove ash is in the morning after an overnight fire when the insert is relatively cool but there is still some chimney draft to draw ash dust into the insert rather than into the room. Always dispose of ash in a tightly covered metal container on a non-combustible surface, well away from combustible materials — ash retains hot embers for days and releases carbon monoxide. Never store ashes indoors, in a non-metallic container, or on a wooden deck.

Glass cleaning. Damp newspaper dipped in cold ash, or a dedicated ceramic-glass cleaner. Daily wipe during low-burn weather; weekly during high-burn. Black streaks at the lower edge mean wet wood; black uniformly across the glass means burns are running too cool. Brown stains at the lower corners mean smoky combustion. Do not clean the glass when the insert is hot, and do not strike or slam the glass door shut.

Door and glass gaskets. Per the manual, the door gasket needs replacement when the paper-strip test fails: close the door on a strip of paper and try to pull it out; firm resistance means the gasket is sealing, easy pull means it's time to replace. Test all the way around the door. The latch mechanism is adjustable — remove the split pin with pliers and turn the handle one counterclockwise turn to increase pressure. Plan on every 3–5 seasons in regular use.

Annual chimney sweep. Per the manual, the chimney and liner should be cleaned and inspected at least once each year. Inspect every two months during the heating season until you know your creosote-formation rate; monthly is safer for new burners. If buildup reaches 1/8 inch, sweep immediately. The baffle and secondary tubes lift out for sweep access. Insert installations make sweeping more involved than freestanding stoves — many owners hire a CSIA-certified sweep rather than doing it themselves.

Wood seasoning. Hardwood needs 12–24 months split, stacked off the ground, top-covered, with sun and wind on the sides. Don't trust supplier "seasoned" claims — use a pin-type moisture meter, split a piece in half, measure the fresh face. Manual target: 15–20% moisture. Wood above 25% will smolder, soot the glass, line the chimney with creosote, and undercut every published efficiency and emissions number on this page.

Blower maintenance. Keep the blower intake and fins free of dust. Vacuum dust accumulation annually. Do not oil the blower unless the manual specifically calls for lubrication. If the blower fails to engage automatically when the insert reaches operating temperature, have the installer or dealer inspect the thermodisc mounting and contact with the insert body — improper seating is the most common cause of auto-activation issues on this insert. Replacement blowers and related service parts are available through Osburn/SBI dealers and parts channels if needed years out.

Refractory bricks and baffle. The intense heat of the fire can cause slight cracks in the refractory bricks — minor cracks do not reduce effectiveness. Inspect periodically and replace any wider cracks. The baffle and secondary tubes can be removed for sweep access and inspection. Operation with a cracked or missing baffle may cause unsafe temperatures and voids the warranty.

Chimney fire response. If a chimney fire occurs: close the insert door and the air-intake control, alert occupants, contact the fire department if assistance is needed, use a dry chemical fire extinguisher or baking soda or sand to control the fire (never water — it causes a dangerous steam explosion), and do not use the appliance again until the insert and chimney have been inspected by a qualified chimney sweep or fire-department inspector.

What never to burn. Per the manual and EPA fuel rules: no coal, garbage, yard waste, materials containing rubber or plastic, waste petroleum products, paint or paint thinners, asphalt products, painted or pressure-treated wood, railroad ties, manure or animal remains, plywood, particle board, paper products, asbestos materials, construction or demolition debris, salt-water driftwood, or unseasoned wood. This does not prohibit normal fire starters made from paper, cardboard, sawdust, wax, or similar substances when used only to start a fire. Burning prohibited materials destroys the firebox, voids the warranty, and releases toxic compounds into your home and the chimney. Do not burn compressed logs made of wax-impregnated sawdust or logs with chemical additives; 100% compressed-sawdust logs can be used with caution.

The Osburn limited lifetime warranty applies to the original retail purchaser only and is non-transferable. The warranty applies to normal residential use only. Proof of purchase (dated bill of sale), model name, and serial number are required for any warranty claim. Online registration is recommended at osburn-mfg.com but not required if a dated invoice is retained.

Coverage by component

A one-time replacement limit applies to all parts with lifetime coverage. Warranty is void if the unit is used to burn anything other than seasoned cordwood, or if it is not operated according to the owner's manual. Damage caused by misuse, improper installation, lack of maintenance, overfiring, downdrafts, venting problems, or under-estimated heating area is not covered. Improper installation by anyone other than an authorized qualified technician voids the warranty.

Warranty claims are made through your Osburn dealer and remain subject to SBI/Osburn inspection, approval, and the current written warranty. Kaminos is the retailer for this insert and supports buyers through purchase; final warranty approval rests with SBI as the manufacturer. SBI's parts network is well-stocked — replacement bricks, baffle, secondary tubes, glass, gaskets, and blower are openly available at fair prices through multiple parts vendors.

Osburn may require photos or returned parts to support a claim; repair work covered by warranty requires prior manufacturer approval.

Coverage details can change by component and warranty revision; the current Osburn warranty controls.