Osburn Inspire 2000-I Wood Insert

Right buyer

Owners of a working masonry fireplace with a medium-to-large opening 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 (24 5/8" H × 29" W × 20 3/4" D per manual) are the basic requirements.

Buyers who want the modern, minimal, picture-window aesthetic — clean horizontal lines, large flush ceramic glass, no cast-iron decorative faceplate. The Inspire is the contemporary-design option in the Osburn insert lineup, designed to let the fire be the visual focus rather than the faceplate.

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 Inspire's 2.4 ft³ firebox sits between the smaller 1700-I and the larger Matrix 2700 in firebox capacity, with the most powerful blower in the line shared with the Matrix 2700 (176 CFM).

Buyers who want the option of NightFlame ceramic glass (sold separately). The optional ROBAX semi-transparent black glass conceals the interior of the firebox when not in use — the insert reads as a clean dark panel against the masonry. When a fire is burning, the glass becomes clear and the flames show through normally. A meaningful design upgrade for buyers who want the insert to disappear visually when not in use.

Buyers who want the most powerful blower in the Osburn insert line. The 176 CFM heat-activated double-cage blower meaningfully outperforms the 144 CFM blowers used in the smaller and larger Osburn inserts. For an insert — where most of the firebox sits inside the masonry cavity — blower CFM is what gets the heat into the room.

Wrong buyer

Not for buyers without an existing code-compliant masonry fireplace with a substantial opening. 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 20 3/4" minimum depth — meaningfully deeper than smaller inserts and the most common reason this insert does not fit a shallower hearth. Not approved for factory-built (prefab) metal fireplaces, mobile homes, alcoves, or freestanding installation.

Not for buyers who want a traditional cast-iron faceplate aesthetic. The Inspire is intentionally modern — no decorative louvers, no framing columns, no cast-iron detailing. Buyers wanting traditional styling should look at the Osburn Matrix 1900, Matrix 2700, or 3500-I.

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 or Matrix 1900.

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.

The Inspire 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 20 3/4" minimum depth is meaningfully deeper than smaller Osburn inserts and is the most common reason this insert does not fit a shallower hearth.

Faceplate options

The Inspire 2000-I requires one faceplate selection at order. Three options are available — buyer picks one to complete the unit:

The 32" × 50" cuttable faceplate is the broadest-coverage option — 16-gauge steel, edges can be trimmed to contour an arched fireplace or to minimize visible flashing. The two narrow faceplates are designed for tighter masonry openings where minimal trim coverage is preferred: the U-shape leaves the bottom open, the 4-sided wraps fully around the insert. Choose the configuration that matches the masonry opening and the look you want — this is a one-time decision configured at order, not field-swappable.

Clearances to combustibles

The certification label on the back of the insert always overrides clearance figures published elsewhere. Reduced clearances are not available by means of heat shields on this insert — the figures above are the binding minimums.

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 Inspire 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 Inspire 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 Inspire 2000-I wood insert (OB02045) with welded carbon-steel firebox and single glass door in steel frame
• Configured at order with required faceplate selection — see "Where it can go" for the three options
• 176 CFM heat-activated double-cage blower assembly with thermodisc auto-on
• C-Cast baffle and stainless-steel secondary-air tube assembly
• Moulded refractory bricks lining
• 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 NightFlame semi-transparent black ceramic glass (SBI AC02775) — conceals the firebox interior when the fire is out; becomes clear when burning
• 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 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. Multiple owner reports describe the insert easily heating 1,500–2,400 sq ft homes when the masonry chimney is up to temperature.

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 176 CFM heat-activated double-cage 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 176 CFM rating is the strongest in the Osburn insert line — shared with the Matrix 2700. With the switch in AUTO, the blower starts automatically once the insert is hot enough and stops when it cools — set the position and forget about it. With the switch in MANUAL, the blower runs continuously regardless of insert temperature. Allow the insert to reach operating temperature (approximately one hour from a cold start) before turning the blower to MANUAL.

The Inspire's blower is the most consistent complaint across owner reports — multiple buyers describe it as loud at higher settings, with several specifically noting they don't run it at full speed because of the noise. The Inspire 2000-I does not include a rheostat for variable speed control (unlike the smaller 1700-I and Matrix 1900) — it is a single-speed blower with AUTO/MANUAL/OFF control only. If sound sensitivity is a concern, this is the most-cited owner caution on this model.

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 wide-format glass — 20 1/4" × 9 1/2" — is the visual centerpiece of the Inspire, which makes glass cleanliness more visually important than on smaller inserts.

The optional NightFlame glass deserves a specific note: in the off state, the semi-transparent black ceramic conceals the firebox interior so the insert reads as a clean dark panel against the masonry. When a fire is burning, the glass becomes clear and flames show normally. A meaningful aesthetic upgrade for buyers who want the insert to disappear visually when not in use.

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.

Blower noise is the dominant owner complaint. Across owner reviews, the most consistent observation is that the 176 CFM blower is loud at higher settings. Several owners explicitly state they avoid running it at full speed because of the noise. Unlike the smaller Osburn inserts with rheostat speed control, the Inspire's blower has only AUTO/MANUAL/OFF — no variable speed. If sound sensitivity is a concern, this is the trade-off to know going in. The blower delivers strong heat distribution, but the volume of air it moves is the trade-off for the audibility.

Large appliance, large masonry opening required. The Inspire's minimum opening of 24 5/8" H × 29" W × 20 3/4" D is substantial — particularly the 20 3/4" depth requirement, which is deeper than most older or smaller fireplaces. Measure carefully before ordering — this is the most common reason an Inspire purchase falls apart at the installation stage.

Modern aesthetic, no decorative elements. The Inspire is intentionally minimal — no cast-iron faceplate, no patterned louvers, no framing columns. If you want traditional cast-iron detailing, this isn't it. The trade-off is that the fire is the visual focus, which is exactly what some buyers want.

Faceplate is a one-time decision, configured at order. Three options at the order stage: 32" × 50" cuttable, 30" × 25 1/8" U-shape, or 30" × 26 7/8" 4-sided. Once selected, not field-swappable. Choose carefully based on the masonry opening you're installing into — the cuttable option provides the broadest coverage; the narrow options for tighter openings.

Efficiency is not the problem here. At 72% HHV, the Inspire is slightly higher on published HHV efficiency than the Osburn 1700-I and 3500-I. The real trade-offs are the modern aesthetic, substantial masonry-opening requirement, 2.3 g/hr emissions, and blower noise — not efficiency.

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 large inserts is buying for the high end of the manufacturer's heating range. Several Inspire owners report heating 1,500–2,400 sq ft homes successfully, but those are not universal results — depends heavily on insulation, climate, and house layout.

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.

435 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.

Shipping damage shows up in reviews. Multiple owner reports cite broken bricks, broken glass, scratched legs, or missing components 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.

NightFlame glass is a meaningful upcharge. The optional ROBAX semi-transparent ceramic glass is a real aesthetic feature, not marketing, but it adds cost. Decide whether the off-state appearance matters enough to justify the upgrade before ordering — it's a meaningful price addition.

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 switch positions. The 176 CFM blower assembly has a three-position switch: (1) AUTO — blower starts when the insert is hot enough and stops when it cools down (thermodisc-controlled); (2) OFF — blower stopped, prevented from starting automatically; (3) MANUAL — runs continuously regardless of insert temperature. Use AUTO for normal operation; use MANUAL only when you want continuous airflow regardless of temperature. Allow the insert to reach operating temperature (approximately one hour from cold start) before turning the blower to MANUAL.

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 Inspire 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. If running the optional NightFlame glass, the same cleaning rules apply.

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. 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. 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.