Enerzone Solution 3.5 Wood Insert

Right buyer

Owners of a large existing masonry fireplace who want serious primary heat output instead of a decorative open fire — single-family homes, well-insulated cabins, or open-plan spaces of roughly 1,500–2,400 sq ft, with reasonable insulation and access to seasoned hardwood at 15–20% moisture content.

Suited to homeowners whose existing masonry opening is large enough to accept a 26 1/4" tall × 31" wide × 18 3/8" deep minimum footprint — meaningfully larger than what most small inserts require. The 22-inch maximum log capacity, 144 CFM included blower, and 3.5 ft³ firebox put this in serious primary-heat territory, not supplemental.

Buyers who want a finished install with their choice of faceplate sizing and trim color: 32" × 44" for moderate-sized openings, 32" × 50" for larger openings, with matching faceplate trim in Black or Brushed Nickel. The faceplate ships with the unit; configuration is selected at order.

Wrong buyer

Not for buyers with smaller hearths. The 31-inch minimum width alone excludes a substantial percentage of older masonry fireplaces — measure before buying. If your opening is borderline, the smaller Destination 1.9 (25-inch minimum width) is the right tool.

Not for buyers who want set-and-forget heating. Wood-burning inserts require active operation: lighting, monitoring, closing the air at the right moment, deciding when to reload. The 3.5 ft³ firebox can leave usable coals after a long burn, but do not expect steady, high output through an entire night.

Not for buyers expecting 14–20+ hour overnight burns. Non-catalytic stoves give you 6–8 hours of useful heat from a packed firebox of dense hardwood, occasionally approaching the 10-hour manufacturer maximum with mild weather and a full coal bed; for longer burns, a catalytic or hybrid insert is the right tool.

Not for small spaces under 1,200 sq ft — at this firebox volume the insert can easily overheat the room at any meaningful burn rate, forcing low burns that smolder, blacken the glass, and produce creosote.

Not for prefab metal fireplaces — those need a different appliance entirely. Not approved for mobile-home or alcove installation.

Not for buyers without a code-compliant masonry fireplace and chimney. The Solution 3.5 Insert requires a continuous 6-inch listed stainless-steel liner from the insert to the top of the chimney; that liner and its installation are not included in the appliance price.

The Solution 3.5 Insert is designed to slide into an existing code-compliant masonry fireplace with a connected and inspected masonry chimney. It is not approved for installation in a factory-built (prefab) metal fireplace, in a mobile home, in any outdoor or unconditioned space, or as a freestanding stove.

Minimum masonry opening

If a fresh-air intake is being installed, add at least 4 inches to the 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.

Faceplate options

Faceplate frame and trim are configured together at order. Each size is available in Black or Brushed Nickel trim. The Regular faceplate fits moderate-sized openings; the Large extends the cover area for larger openings.

Clearances to combustibles

Reduced clearances are not available by means of heat shields on this insert — the figures above are the binding minimums.

Floor protection

The hearth extension must be a continuous non-combustible surface in front of the door opening. In the USA, floor protection is measured from the door opening and must follow the manual's hearth-extension calculation; in Canada, 18 inches forward and 8 inches each side are typical requirements, subject to the manual notes and local code. Tile alone is not sufficient — the manual requires a continuous non-combustible sheet beneath any tile installation. If the existing masonry hearth extension is long enough, additional floor protection may not be needed. If added floor protection is required in front of a hearth that is level with, or raised 5 inches or less above, the combustible floor, the added protection must meet the manual's R-value requirement. If the masonry hearth is raised more than 5 inches, standard non-combustible ember protection may be sufficient. Final hearth protection must be calculated from the manual's floor-protection worksheet and approved by the installer/AHJ.

Chimney and liner

The Solution 3.5 Insert 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 or CAN/ULC-S640 (Canada) or UL 1777 (USA) and be rated for solid fuel. The minimum liner height is 15 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 insert is not approved for a "positive flue connection" to clay tile — a continuous stainless liner is required.

An insulated liner (or pre-insulated liner with a 1/2-inch wrap) is strongly recommended even for interior chimneys. It improves draft, reduces creosote, and is required by code in some jurisdictions for clearance reasons. A sheet-metal block-off plate sealed at the damper level with high-temp silicone and backed with mineral wool insulation is likewise optional under code but effectively required in practice for the insert to deliver rated performance — without it, jacket-recovered heat is lost into the smoke chamber.

Outside air

An optional 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. 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

• Solution 3.5 Insert (EB00062) with welded carbon-steel firebox and cast-iron arched door
• Faceplate frame and trim, configured together at order — see "Where it can go" for options
• 144 CFM variable-speed crossflow blower with included thermodisc heat sensor for automatic on/off
• Ash lip
• C-Cast baffle and stainless-steel secondary-air tube assembly
• Refractory firebrick lining
• Removable wood-grip air-control handle
• Owner's manual and product documentation

Sold separately

• 6-inch stainless-steel chimney liner sized for the full height of the chimney, with appliance connector, top plate, and rain cap — required, not optional
• Optional offset liner adapter (SBI AC01214) — for installations where the masonry flue is offset from the insert
• Optional liner hook-up system (SBI AC02006) — simplifies liner-to-flue-collar connection
• Insulation wrap for the liner (or a pre-insulated liner) — strongly recommended for all installs, code-required in some
• Sheet-metal block-off plate, high-temp silicone, and mineral wool insulation — effectively required in practice for the insert to deliver rated performance
• Hearth pad or hearth extension sized to manual specifications, with continuous non-combustible sheet beneath any tile
• Optional tempered glass hearth pad 10mm 18" × 50" (SBI AC02760)
• 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 rigid fire screen (SBI AC01281) — not permitted for open-door use in the United States or in Canadian provinces/jurisdictions with particulate-emission limits; never leave the insert unattended when used with a fire screen
• Pin-type wood moisture meter — not optional in practice
• Flue thermometer or installer-recommended temperature-monitoring method — strongly recommended; not optional in practice
• Installation by an authorized qualified technician (WETT, NFI, or CSIA certified) — required for warranty coverage and often required by code, permit, or insurance

The 110,000 BTU/hr figure is a maximum-output rating based 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 a 25,000–55,000 BTU/hr band depending on wood density, moisture, and air setting.

A realistic burn cycle from owner reports in cold-climate primary use: a packed load of well-seasoned hardwood produces a fast 30-minute warm-up to high firebox temperatures, then 2–3 hours of strong sustained heat, then a slow decline over the next several hours, then several more hours of low steady heat with a heavy coal bed. Total useful heat from one full pack: 6–9 hours in normal heating use, occasionally approaching the 10-hour manufacturer maximum with dense hardwood, mild weather, and a full coal bed. Reload onto coals when heat output falls off and the cycle restarts.

The 22-inch maximum log capacity is a practical advantage. Most firewood suppliers cut to 16 inches, which is also the manual's recommended length. An insert that takes up to 22 inches lets you load larger splits with less labor when your supplier cuts longer. The firebox accommodates substantial north-south loads — owners regularly fit 8–10 medium splits N-S for overnight burns.

The included 144 CFM blower meaningfully improves heat transfer from the air jacket into the room. There are two controls: a manual rheostat marked HI / LO / OFF that you set, and an automatic heat sensor (thermodisc) that decides when the blower actually runs. Set the rheostat to LO or HI, and the sensor handles the rest — the insert takes about an hour to reach blower-activation temperature from a cold start, then the sensor starts the blower automatically and shuts it off when the insert cools at the end of a burn. No need to remember to start it once the fire is going or shut it off when the fire dies down. At lower settings the blower is unobtrusive; at higher settings it is audible. Per the manual, regular blower use can deliver up to about a 2% efficiency boost. Without the blower — in a power outage, for example — the insert will still burn safely; the room will receive less convective heat transfer, with most of the available heat being radiant through the glass.

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 tube inserts, not specific to Enerzone, and it is the strongest signal that your wood is too wet or your burn is too cool.

The opening is the gating factor. The 26 1/4" × 31" × 18 3/8" minimum masonry opening is meaningfully larger than the smaller Enerzone inserts. The 31-inch minimum width in particular excludes a substantial percentage of older masonry fireplaces. Measure carefully before buying — and if the opening is borderline, the smaller Destination 1.9 (25-inch minimum width) is the right tool.

Non-catalytic burn time. A non-cat insert gives you simpler operation and no catalyst to replace, but you pay for it with shorter burns. If you want to load at 9 PM and have meaningful heat at 6 AM, this is not the right tool — that is what a Blaze King Princess Insert or Lopi Cape Cod is built for. Plan on reloading every 4–6 hours during active heating and accepting that overnight will end at coals.

Wood loading is a daily activity. A full load of dense hardwood is heavy and physically involved; in cold-climate primary-use patterns, wood handling becomes a daily chore, not an occasional task. Wood has to be split, stacked off the ground, top-covered, and seasoned to 15–20% moisture before use. Most local firewood suppliers can deliver hardwood by the cord; confirm whether they sell genuinely seasoned wood or plan to season it yourself.

Reload technique matters. Reload onto an active coal bed, open the air fully before opening the door, and open the door slowly to avoid smoke rollout. After reloading, run the air open until the new load is fully engaged, then reduce the air gradually. Do not leave the insert unattended with the door partly open; the manual treats door-ajar operation as a lighting/reloading procedure, not a normal burn mode.

Glass blackens at low burn rates. This is the non-cat tube design — secondary combustion only burns clean at higher temperatures. The fix is a daily hot burn cycle to clean off accumulated tar, dry wood at 20% moisture or below, and tolerance for a brief cleaning every few days during low-and-slow weather.

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.

Plain Enerzone styling. The Solution 3.5 Insert has clean, simple lines: a cast-iron arched door, a steel jacket, and a faceplate that flashes around the masonry opening. It is not ornate. Buyers who want premium cast-iron decorative faceplate detailing should look at Osburn's larger inserts or premium-tier options like Lopi Cape Cod.

Heavy-duty internals, functional finish. The welded carbon-steel firebox, C-Cast baffle, lifetime weld warranty, and 144 CFM blower are strong points for the category. The overall fit-and-finish is practical rather than luxury: this is a heating appliance first, not a furniture-grade cast-iron showpiece.

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. The manual describes three effective methods: conventional (newspaper at the bottom, kindling on top, then small splits), top-down (small splits at the base, smaller splits crossed over, kindling on top, paper at the very top, light the top), or two parallel logs (paper between two split logs, kindling across, log-cabin style). Cleaner ignition with the top-down method, less smoke, faster to operating temperature. Leave the door slightly ajar for a few minutes during light-off; close once the fire is well established.

Air control. Single-lever, located underneath the ash shelf. Pull the handle completely (HIGH) to open, push completely (LOW) to close. Full open at light-off, gradually closed only after the load is fully engaged and stable secondary flames are established. Close the air control only when the firebox is full of bright turbulent flames, the wood is charred, and its edges are glowing. A flue thermometer is strongly recommended; without one, you are guessing at draft, burn rate, and overfire risk. Do not elevate the fire by using a grate.

Reload cadence. 4–6 hours between reloads in active high-output use; 6–8 hours for a final overnight pack with the air shut hard. Open the air, wait briefly, open the door slowly to avoid smoke rollout, rake coals forward, load onto the coal bed, close the door, and run the air open until the new load is fully engaged before reducing the air gradually. Turn the blower OFF before opening the door fully to reduce ash disturbance.

Ash management. Ash should be removed from the firebox every two to three days of full-time heating. The best time to remove ash is in the morning, after an overnight fire when the insert is relatively cold but there is still a little chimney draft to draw the ash dust into the insert and prevent going out 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.

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.

Door and glass gaskets. 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, not just at the latch. Glass gasket replaces likewise. Materials run $20–$40 per gasket; replacement is a 30-minute job. 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. If buildup reaches 1/8 inch, sweep immediately. The baffle and secondary tubes lift out for sweep access.

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. Vacuum the blower fins annually. Do not oil the blower unless the manual specifically calls for lubrication. Replacement blowers and related service parts are available through Enerzone/SBI dealers and parts channels if needed years out.

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.

The Enerzone 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 enerzone-intl.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 Enerzone dealer and remain subject to SBI/Enerzone 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.

Enerzone 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 Enerzone warranty controls.