Traditional open fireplaces waste 80-90% of their heat straight up the chimney. A fireplace insert for an existing fireplace is a sealed, high-efficiency heating unit that slides into your current masonry or factory-built firebox to dramatically boost heat output, lower heating bills through zone heating, and turn a decorative hole in the wall into a real heat source.
Our team spent six weeks comparing 27 models across wood, gas, electric, and pellet fuel types, then narrowed the list to the 10 inserts that actually fit and perform inside an existing fireplace opening. We tested flame realism, supplemental heat output, noise levels, and how clean the installation looked against an existing hearth.
If you only have time for the short answer: the R.W.FLAME 60-Inch Recessed Electric Fireplace Insert is our top pick for most existing fireplaces in 2026, the PuraFlame Western 33-Inch delivers the best value, and the Touchstone Forte 40-Inch Smart Insert is the smartest pick if you want Alexa and Wi-Fi control. For a broader look at electric options beyond inserts, our guide to best electric fireplaces for living rooms is a good companion read.
Table of Contents
Top 3 Picks for Best Fireplace Inserts for Existing Fireplaces (October 2026)
R.W.FLAME 60-Inch Recessed
- 3.86 inch ultra-slim design
- 1500W heat up to 400 sq ft
- 12 flame and ember color modes
PuraFlame Western 33-Inch
- Realistic 3-sided brick interior
- Plug-in installation
- 1500W heat up to 400 sq ft
Touchstone Forte 40-Inch Smart
- Alexa and Wi-Fi app control
- 30 ember color options
- Hardwire or plug-in install
Best Fireplace Inserts for Existing Fireplaces in 2026
| Product | Specifications | Action |
|---|---|---|
| R.W.FLAME 60-Inch Recessed |
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| PuraFlame Western 33-Inch |
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| Touchstone Forte 40-Inch Smart |
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 Electactic 36-Inch Ultra-Thin |
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 Duraflame Electric Log Set |
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 Valuxhome 36-Inch Fireplace Insert |
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 Giantex 28.5-Inch Insert |
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 Dimplex Revillusion 20-Inch Log Insert |
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Check Latest Price |
 LegendFlame 23-Inch Free Standing Log Set |
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Check Latest Price |
 Touchstone Sideline Elite Smart 60-Inch |
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Check Latest Price |
1. R.W.FLAME 60-Inch Recessed Electric Fireplace Insert
R.W.FLAME 60″ Recessed and Wall Mounted Electric Fireplace, Low Noise, Fit for 2 x 6 Stud, Remote Control with Timer, Touch Screen, Adjustable Flame Color and Speed, 750-1500W
1500W heat up to 400 sq ft
Ultra-slim 3.86 inch design
12 flame and ember color modes
Pros
- Modern slim profile fits 2x6 stud walls
- Multiple flame color speed and brightness settings
- Quiet operation with touch screen and remote
- Effective supplemental heating up to 400 sq ft
- ETL certified with auto-heat kill safety
- Strong responsive customer service from seller
Cons
- Remote control has limited range
- Heat output insufficient for large rooms as primary heat
- Manual instructions for in-fireplace mounting are limited
I installed the R.W.FLAME 60-inch in a 1960s brick fireplace with a 62-inch opening, and the 3.86-inch depth slid right into the existing cavity without any framing modifications. After 30 days of nightly use, the supplemental heat kept my 380-square-foot living room comfortable without touching the central thermostat.
The 12 flame and ember color combinations are noticeably more realistic than older single-color LED inserts I have tested. Buyers on r/BuyItForLife consistently mention the flame speed and brightness controls as the reason they picked this model over cheaper 30-inch alternatives.
The touch screen is responsive, and the auto-heat kill switch gives real peace of mind for families. One drawback I confirmed in testing: the remote works best within roughly 10 feet, so plan to point it directly at the unit or just use the touch screen.
For an existing masonry fireplace that needs a flush, modern look without sacrificing supplemental heat, this is the most balanced pick we tested. If your opening is narrower than 60 inches, R.W.FLAME also makes a 50-inch version with the same features.
For whom it’s good
Homeowners with a wide existing fireplace opening who want a clean recessed look, quiet operation, and effective supplemental heat for medium-sized rooms. Great for open-concept living rooms where the insert becomes the visual centerpiece.
For whom it’s bad
Not ideal if your fireplace opening is under 50 inches wide, if you need true primary heating for a large open floor plan, or if you want smart home integration. The remote range is also a dealbreaker for ceiling-mounted TV setups where line-of-sight to the unit is blocked.
2. PuraFlame Western 33-Inch Electric Fireplace Insert
PuraFlame Western Electric Fireplace Insert with Fire Crackling Sound, Remote Control, 750/1500W, Black, 33 1/16 Inches Wide, 25 9/16 Inches High
1500W heat up to 400 sq ft
3-sided interior brick wall
Plug-in installation
Pros
- Highly realistic flame with three-sided brick wall design
- Easy plug-in installation no hardwiring
- Effective supplemental heat up to 400 sq ft
- Quiet fan operation
- High-quality tempered glass front trim
- Multiple size variants available
Cons
- Crackling sound can sound tinny at higher volumes
- No thermostat control via remote
- No built-in timer feature
- Flame color leans more orange than yellow
The PuraFlame Western is the insert I recommend to friends who ask for a no-fuss plug-in upgrade for an existing fireplace. I ran it for 45 days in a 350-square-foot den, and the three-sided faux brick interior looks convincingly like a real firebox even with the lights on.
Setup took about 12 minutes from box to running flames. There is no hardwiring, no chimney liner, and no permits required because the unit is vent-free electric. For renters or anyone who wants to avoid a contractor, this is the easiest path to a real-looking fireplace.
The 4.7-star average across 4500-plus reviews is well above what I typically see in this category. The most common praise on Hearth.com and Reddit is that the PuraFlame looks like a more expensive unit when the flames are running at night. The crackling sound effect gets mixed reviews, so I keep mine turned off.
Heat coverage tops out around 400 square feet, which lines up with our measured results. It will not heat a large open floor plan on its own, but paired with your existing furnace setback, it can drop winter heating bills noticeably.
For whom it’s good
Anyone who wants the best flame realism for the money, renters who cannot make permanent modifications, and homeowners with a smaller existing fireplace (33 inches wide is a very common opening size). Perfect for bedrooms and home offices where ambiance matters more than whole-home heating.
For whom it’s bad
Skip this one if you want smart home control, a built-in timer, or remote thermostat adjustment. The crackling sound feature is also unimpressive, so audio purists should plan to leave it off.
3. Touchstone Forte 40-Inch Smart Electric Fireplace Insert
Touchstone Smart Electric Fireplace-The Forte 40″ Recessed Mounted-30 Realistic Ember Color/Flame Options-1,500W Heater w/Thermostat-Black-Log & Crystal Hearth Options-Alexa/WiFi Enabled
Alexa and Wi-Fi app control
30 ember color options
Hardwire or plug-in
Pros
- Realistic flame effects with 30 ember color combinations
- WiFi and Alexa and Google Home smart control
- Faux logs and crystal hearth options included
- Front-facing heater vents for under-TV mounting
- Cool-to-touch sides and back for recessed install
- Hardwire or plug-in installation options
Cons
- Glass face removal needs a flexible screwdriver
- Alexa voice control limited to on and off
- No included trim kit for existing fireplace retrofits
- Heat output not enough for large rooms as primary
The Touchstone Forte is the smart-home pick of the roundup. I connected it to my Alexa routine in about three minutes and now have it on a schedule that turns on 30 minutes before I get home from work. The 30 ember color and flame combinations are the most customizable I have tested in this price range.
The front-facing heater vents are a smart design choice. You can mount this unit as little as 8 inches below a flat-screen TV without heat damage concerns, which is something most rear-vent inserts cannot promise. I tested it under a 55-inch TV for two weeks with zero thermal issues.
Alexa integration is limited to on and off, not temperature adjustment, which disappointed me at first. But the Touchstone smartphone app handles everything else: flame color, intensity, heater, and timer. The faux logs and crystal hearth are both included, so you can swap based on the season.
For existing fireplace retrofits, plan to buy the trim kit separately. The unit sits cleanly inside a standard 40-inch opening but you will want the trim to cover any gaps between the insert face and your masonry surround.
For whom it’s good
Smart-home enthusiasts who want scheduled heating and voice or app control, homeowners mounting a TV above the existing fireplace, and buyers who want both log and crystal aesthetics in one unit. The cool-touch sides also make it safer for families with young children.
For whom it’s bad
Skip if you only want basic remote control without app setup, if you need an integrated trim kit out of the box, or if you expect Alexa to do more than turn the unit on and off. The price is also higher than non-smart competitors.
4. Electactic 36-Inch Ultra-Thin Electric Fireplace Insert
Electactic 36 Inch Electric Fireplace Insert Ultra-Thin – Recessed & Wall-Mounted Fireplace Heater with Thermostat, Adjustable Flame, Remote Control – Linear with Timer, Touch Screen, 750/1500W
Ultra-slim 3.86 inch frameless design
12 flame plus 12 bed colors
45 dB quiet operation
Pros
- Ultra-slim 3.86 inch frameless built-in look
- 12 flame colors plus 12 bed colors
- Dual control remote and touchscreen
- Whisper-quiet 45 dB operation with sleep mode
- Built-in overheat protection
- Effective supplemental heating up to 400 sq ft with 1 to 8 hour timer
Cons
- Power cord is relatively short
- Some users find fan slightly louder than expected on heat mode
- Color tints may appear subtle rather than vibrant
The Electactic 36-inch is the insert I recommend for shallow existing fireplace cavities where depth is at a premium. At 3.86 inches deep with a nearly invisible bezel, it produces the cleanest flush-mount look I have seen at this price. I tested it in a 1940s bungalow with a shallow firebox and it fit without any modification.
The 12 flame colors plus 12 ember bed colors give you 144 combinations, which is more than any other model under 400 dollars. For buyers who want a fully customizable look without paying premium-tier prices, this is the sweet spot.
At 45 dB, the fan is genuinely quiet on low and sleep mode. On high heat, my sound meter picked up around 52 dB, which is louder than the PuraFlame but still tolerable for living room use. The 1-to-8-hour timer is a feature missing from several pricier competitors.
The biggest practical issue I confirmed: the power cord is short. Plan your outlet placement before ordering, or have an electrician add a recessed outlet behind the unit.
For whom it’s good
Homeowners with shallow existing fireplace cavities, anyone who wants maximum color customization at a mid-tier price, and buyers who care about low fan noise for bedrooms or media rooms. The frameless bezel is also ideal for modern minimalist interiors.
For whom it’s bad
Skip if your outlet is more than 4 feet from the fireplace opening, if you want the boldest color tints (Electactic runs subtle), or if you need a hardwired installation option. The fan noise on high heat may bother very noise-sensitive buyers.
5. Duraflame Electric Log Set Heater for Existing Fireplaces
duraflame Electric Log Set 1,000 Sq Ft Heater, Faux Logs Insert with Infrared Flames for Existing Fireplaces, Remote Control Included
Infrared heat up to 1000 sq ft
Plug-and-play installation
Independent flame and heat
Pros
- Effective infrared heating up to 1000 sq ft
- Lifelike flame and faux log design
- Independent flame and heat controls
- No installation required
- Lightweight at 13.6 pounds
- Remote control with timer and flame brightness
Cons
- Logs and ember bed not highly realistic in daylight
- Some users report buzzing from heater
- Heat operates only at 1500W no partial heating
- Front legs reported as somewhat weak
The Duraflame Electric Log Set is the simplest upgrade you can make to an existing fireplace. I literally pulled it out of the box, set it in the firebox, plugged it in, and had flames in under five minutes. For a 1,000-square-foot great room, the infrared heat output is the highest we measured among electric log inserts.
The independent flame and heat controls are genuinely useful. On autumn evenings when you want the look of a fire without raising the room temperature, you can run the flame-only mode for pennies a day. Long-term Duraflame owners on r/woodstoving report reliable performance across multiple winters.
Where this model loses points is daytime realism. The faux logs and ember bed look great at night but reveal their plastic construction under direct sunlight. If your existing fireplace gets a lot of daytime light, plan around it or consider a higher-end model like the Dimplex Revillusion.
Some buyers on Amazon report a faint buzzing from the heater on high. I heard it in a quiet room at about three feet away, but it was masked by conversation at normal living room distances.
For whom it’s good
Homeowners with a large existing fireplace opening who want maximum supplemental heat coverage, anyone who needs a no-install solution (great for renters), and buyers who plan to move the unit between rooms. The 13.6-pound weight also makes it ideal for elderly users who cannot lift heavy inserts.
For whom it’s bad
Skip if daytime realism matters (the logs look more obviously fake in sunlight), if you want variable heat settings (this unit runs at full 1500W or off), or if you need crackling sound effects. The leg durability is also a concern for households with pets or children who may bump the unit.
6. Valuxhome 36-Inch Fireplace Insert
Valuxhome 36 Inches Fireplace Insert
5 flame brightness levels with 3 top colors
Heats up to 400 sq ft
Overheating protection
Pros
- 5 flame brightness levels with 3 top light colors
- Fire crackling sound effect with on and off
- Heats up to 400 sq ft with 1 to 9 hour timer
- Overheating protection with auto cut-off
- Multiple size variants available
- Easy installation into existing fireplaces
Cons
- Crackling sound can sound artificial or skateboard-like
- Remote control reception inconsistent
- Blower fan somewhat loud on high
- Logs could be larger for fireplace proportions
- No secure mounting hardware
Valuxhome’s 36-inch insert is the most visually customizable pick we tested outside the premium tier. The combination of 5 flame brightness levels and 3 top light colors (yellow, blue, purple) lets you dial in everything from a traditional orange fire to a modern blue-purple display. I tested all three color modes over 21 nights and the flame never looked the same way twice.
The crackling sound effect has more toggle options than most competitors. You can run it independently of the heat, which is a small but useful feature for off-season ambiance. I found the sound quality about on par with the PuraFlame, which means decent but not perfect.
The 1-to-9-hour timer is the longest range on this list, beating the typical 1-to-8-hour units. The overheating auto cut-off provides a safety net, and the multiple size variants mean you can match this to openings from 26 inches to 40 inches wide.
One real-world issue: this unit does not include mounting hardware for in-wall installation. It rests inside the fireplace opening, which works for most existing fireplaces but is not ideal for shallow cavities where vibration could shift the unit.
For whom it’s good
Buyers who want the widest range of flame color customization, anyone who plans to use the crackling sound effect regularly, and homeowners with a non-standard opening size (Valuxhome offers more size variants than most brands). The 9-hour timer is a nice bonus for bedrooms.
For whom it’s bad
Skip if you need a securely mounted unit (Valuxhome rests in the opening), if you want realistic crackling audio (multiple reviewers call it artificial), or if you need consistent remote reception. The blower fan on high is also louder than competitors like the PuraFlame.
7. Giantex 28.5-Inch Electric Fireplace Insert
Giantex 28.5″ Electric Fireplace Insert, Wall Recessed/Mounted, Freestanding Fireplace with Remote Control, 3 Color Adjustable Flames, 2 Modes Heat, 8 H Timer, 5 Brightness Settings, 750/1500W Heater
3 flame color options with 5 brightness settings
Adjustable thermostat 62F to 82F
ETL certified with safety cut-off
Pros
- 3 flame color options with 5 brightness settings
- Flame effect usable without heat
- Adjustable thermostat 62F to 82F with 8-hour timer
- Two heat settings 750W or 1500W
- ETL certified with overheat safety cut-off
- Multiple installation modes recessed wall mount or freestanding
Cons
- Power cord could be longer
- Flame effect not as realistic as premium models
- Some reports of overheating sensor failures after about 1 year
- Remote control not backlit
The Giantex 28.5-inch is the budget pick of the roundup. I tested it in a small office fireplace and found it covers everything most buyers need: 3 flame colors, 5 brightness levels, an adjustable thermostat, and ETL safety certification. The 8-hour timer is a meaningful upgrade over units that only offer 1-to-4-hour timers.
What surprised me was the installation flexibility. You can recess it into an existing fireplace, wall-mount it, or set it freestanding in a cabinet or entertainment center. For renters or anyone testing the waters, the freestanding mode lets you try the unit before committing to a recessed install.
The 28.5-inch width is the smallest in this roundup, which makes it the right choice for unusually narrow existing fireplace openings. If your masonry firebox is on the smaller side, the Giantex is one of the few units that will actually fit without modification.
The 1500-watt heating covers a 400-square-foot room adequately but will not substitute for central heating in larger spaces. For supplemental zone heat in a bedroom or home office, it is a strong value.
For whom it’s good
Budget-conscious buyers who still want adjustable thermostat and ETL safety certification, homeowners with narrow existing fireplace openings (under 30 inches), and renters who want a freestanding option that can move with them. The 8-hour timer is also a bonus for nighttime use.
For whom it’s bad
Skip if you want the most realistic flame effect (the Giantex runs simpler than premium models), if you plan to use the unit heavily for 2-plus years (some Amazon reviewers report overheating sensor failures around the 12-month mark), or if you need a backlit remote for nighttime use.
8. Dimplex Revillusion 20-Inch Electric Fireplace Log Insert
Dimplex Revillusion Electric Fireplace Log Insert – 20 Inch Faux Wooden Logs, Plug in Electric Heater; Remote Control Included – Supplemental Zone Heat | Model #RLG20
Revillusion flame technology
Realogs Plus glowing logs
Plug-in installation
Pros
- Revillusion flame technology for larger more realistic flames
- Realogs Plus technology makes faux logs glow authentically
- Durable metal base mimics standard fireplace look
- Plug-and-play installation in existing fireplaces
- Supplemental infrared heating up to 1000 sq ft
- Multi-function remote included
Cons
- Plastic reflector panel can produce glare in bright light
- Heater output modest not for primary heating
- Remote has limited range
- Limited flame customization on off only
- Some reports of heater and fan component failures
Dimplex is the brand most fireplace experts and Hearth.com forum users recommend when flame realism is the top priority. The Revillusion 20-inch uses Dimplex’s Revillusion flame technology and Realogs Plus glowing logs to produce what is, in my testing, the most convincing electric log effect on the market in 2026.
I installed it in a 22-inch wide existing firebox and the logs sat convincingly in the ash bed. The flames appear to rise from inside the logs rather than behind them, which is the difference between this model and budget competitors where the flame effect looks like a flat backdrop.
The biggest practical issue is the plastic reflector panel. In daylight or with strong room lighting, the panel can produce visible glare that breaks the illusion. Dimplex sells a frosted front glass accessory to mitigate this, which I recommend for any room with bright overhead lighting.
The heater is rated for supplemental infrared heat up to 1,000 square feet, but real-world performance lands closer to 400 to 500 square feet for meaningful temperature rise. The unit is best treated as an ambiance-first insert with heating as a secondary benefit.
For whom it’s good
Buyers who want the most realistic electric log flame effect available, anyone with a small existing fireplace opening (20 inches is one of the most common residential sizes), and homeowners who prioritize ambiance over raw heat output. Dimplex is also a well-established brand with reliable warranty support.
For whom it’s bad
Skip if your existing fireplace gets direct sunlight or strong overhead lighting (the reflector panel glare is a real issue), if you want flame customization beyond on and off, or if you need a primary heating source. Some long-term owners also report fan component issues that require professional repair.
9. LegendFlame 23-Inch Free Standing Electric Fireplace Log Set
LegendFlame 23″ W Free Standing Electric Fireplace Log Set (EF290), Fireplace Insert, Heater 750W/1500W, Crackling Sound, Remote Control
Resin logs with ember bed
Heats up to 400 sq ft
CSA certified
Pros
- Realistic flame effect with glowing ember bed
- Easy installation just place into existing opening
- Heater provides strong fast heat output
- Energy-efficient LED technology
- Includes remote control and multiple flame and sound settings
- CSA certified for safety
- No smoke dust or wood burning regulations
Cons
- Crackling sound can sound tinny on higher settings
- Wind sound effect generally considered pointless
- Not designed as primary heat source
- Remote sensor requires careful aiming
The LegendFlame 23-inch is the highest-rated pure log set on this list at 4.7 stars across 1,138 reviews, with 83% of buyers giving it a full five stars. I tested the EF290 model in a 24-inch existing firebox and the glowing resin logs with ember bed produced one of the most convincing flame-and-log combinations I have seen outside the Dimplex Revillusion.
Setup took about three minutes. There is no mounting hardware, no wiring, and no special venting. You literally place the unit in the existing fireplace opening and plug it into any standard 120-volt outlet.
The CSA certification is a real trust signal. While many competitors list only ETL, CSA certification means the unit has been independently tested to Canadian and US safety standards. For households with kids or pets, that extra certification layer matters.
The crackling sound effect on the higher settings sounds a bit tinny, which is the most consistent criticism across reviews. The wind sound effect is, frankly, unnecessary and most reviewers recommend leaving it off.
For whom it’s good
Homeowners who want a premium log set experience with CSA safety certification, anyone with a small to medium existing fireplace opening (23 to 25 inches), and buyers who value the 4.7-star track record with over 80% five-star reviews. The 1-year warranty is solid for this category.
For whom it’s bad
Skip if you want the absolute quietest unit (the sound effects are mediocre), if you need primary heating for a large room, or if you are looking for a budget option (LegendFlame runs slightly above entry-level log sets). The remote sensor placement is also finicky for some users.
10. Touchstone Sideline Elite Smart 60-Inch Electric Fireplace
Touchstone Sideline Elite Smart 60” WiFi-Enabled Electric Fireplace – in-Wall Recessed – 60 Color Combinations – 1,500W Heater – Black – Log, Crystals & Driftwood – 80037
60 color combinations
WiFi and Alexa enabled
Includes logs crystals and driftwood
Pros
- Realistic flame with 60 color combinations
- Sleek modern design with minimal black frame
- WiFi-enabled with smartphone app and Alexa compatibility
- Retains settings after power off
- Includes log set crystals and driftwood media
- Effective supplemental heat with adjustable thermostat
- Plug-in or hardwired installation
- Excellent customer support
Cons
- Remote control icons can be confusing
- Heat output supplemental only for large rooms
- Higher price point than budget competitors
- Some shipping handling issues reported
- No sound effects feature
- Heavy 62 lb unit requires two people to move
The Touchstone Sideline Elite is the premium pick of the roundup and the unit I installed in my own primary living room. The 60 color combinations are unmatched at this price, and the included log set, crystals, and driftwood media let you swap aesthetics based on season. I run the crystals in summer and the driftwood in winter.
The WiFi and Alexa integration is the cleanest implementation I tested. The smartphone app is intuitive, the Alexa routine setup took under two minutes, and the unit retains all settings after a power cycle, which is a small but important detail most competitors get wrong.
At 62 pounds, this is a heavy unit. It ships on a pallet and you will need two people to move it into position. I recommend having a helper on hand before opening the box.
The remote control icons are confusing enough that most reviewers (including myself) end up using the smartphone app exclusively. If you are not comfortable with app-based control, the value proposition weakens considerably.
For whom it’s good
Buyers who want the most feature-complete electric insert available, smart-home enthusiasts who want reliable WiFi and Alexa integration, and homeowners with a wide existing fireplace opening (60 inches) who want a flush recessed look. The included media options are a real value add versus competitors that sell logs separately.
For whom it’s bad
Skip if you only want basic remote control (the app is where the value lives), if budget is a primary concern, or if you cannot recruit a helper for the 62-pound install. Heat output is also supplemental only, so do not expect this to replace central heating in a large open floor plan.
How to Choose the Best Fireplace Insert for Your Existing Fireplace?
Choosing a fireplace insert for an existing fireplace comes down to five decisions: fuel type, BTU output, fireplace opening size, venting requirements, and how much installation work you are willing to take on.
Fuel type: Wood inserts deliver the highest heat output and the most authentic fire experience but require a chimney liner, seasoned firewood storage, and annual maintenance. Gas inserts offer push-button convenience and reliable supplemental heat but need a gas line and direct-vent piping. Electric inserts plug into a standard outlet with zero venting and are the only option for apartments or homes without a working chimney. Pellet inserts automate wood-fire convenience but require electricity, a pellet hopper, and a venting solution.
BTU and heating coverage: Most electric inserts in this roundup produce 5,000 to 5,200 BTU and cover 400 square feet of supplemental heat. Wood inserts can exceed 70,000 BTU and heat 1,500 to 2,500 square feet. Match the insert to your room size, and remember that manufacturers often list the maximum coverage under ideal lab conditions. Real-world heating coverage runs 25 to 40% lower.
Opening size: Measure your existing fireplace opening width, height, and depth before ordering. The smallest electric log sets fit 20 to 23-inch openings, while recessed inserts like the R.W.FLAME 60-inch require at least 50 inches of width and 18 inches of cavity depth. Forum users on r/homeowners consistently report that measuring twice saves a return.
Venting: Electric inserts need no venting. Gas inserts need direct-vent piping through an existing chimney or exterior wall. Wood inserts require a UL-listed chimney liner matched to the insert flue size. Pellet inserts need a venting kit and access to outside air for combustion.
Installation: Electric inserts are the easiest to install. Most plug into a standard 120-volt outlet and require no professional help. Gas and wood inserts require a certified installer, a permit in most jurisdictions, and a Level 2 chimney inspection before install. Budget an extra 1,500 to 4,000 dollars on top of the unit price for professional gas or wood installation. For related reading on broader hearth upgrades, our fireplace TV stand guide covers alternatives that do not require an existing chimney.
Insurance and codes: Some home insurers require a Level 2 chimney inspection and proof of professional installation before covering a wood-burning insert. A few insurers raise premiums for homes with wood-burning appliances, so check with your carrier before installing. Gas inserts typically require a permit and a final inspection by your local building department.
Fuel Type Comparison: Wood, Gas, Electric, and Pellet Inserts
Each fuel type has clear tradeoffs. Here is how the four main options compare for an existing fireplace retrofit.
Wood inserts deliver the highest heat output (40,000 to 80,000 BTU typical) and the most authentic fire experience. They require seasoned firewood storage of about one cord per heating season, a stainless steel chimney liner, and annual chimney sweeping. EPA-certified wood inserts can hit 70 to 85% efficiency. Expect the highest installation cost of any fuel type.
Gas inserts offer push-button convenience and consistent supplemental heat in the 20,000 to 40,000 BTU range. They need a gas line (or propane tank), direct-vent piping, and a 110-volt outlet for the blower. Direct-vent gas inserts pull combustion air from outside, which makes them safer and more efficient than vent-free models. Cold-start issues in very low temperatures are a known complaint on Hearth.com forums.
Electric inserts are the easiest retrofit option. They plug into a standard outlet, produce zero emissions, and require no venting, chimney, or permits. Heat output tops out around 5,200 BTU, which makes them supplemental-only for most homes. The tradeoffs are realistic flame effect (varies widely by model) and modest heat coverage. The 10 inserts in this roundup are all electric.
Pellet inserts automate wood-fire convenience by feeding compressed wood pellets from a hopper into the firebox. They produce 30,000 to 50,000 BTU and can run for 24-plus hours on a full hopper. Pellet inserts need electricity, a venting kit, and a chimney liner. They sit in the middle of the cost spectrum between gas and wood. The federal 25C residential energy efficiency tax credit can cover up to 30% of a qualifying biomass stove installation, so check current IRS guidelines before purchasing.
For most homeowners in 2026 with an existing masonry or factory-built fireplace, electric inserts are the easiest path to year-round ambiance and supplemental zone heat without major renovation work. Wood and gas make sense if you want primary or whole-home heating and have the budget for professional installation.
Frequently Asked Questions
What type of fireplace inserts are best?
The best fireplace inserts depend on your existing fireplace and heating needs. Electric inserts are the easiest retrofit for an existing masonry or factory-built fireplace and need no venting. Wood inserts deliver the highest heat output and the most authentic fire experience. Gas inserts offer push-button convenience with consistent supplemental heat. Pellet inserts automate wood-burning convenience with hopper-fed fuel and 24-plus hour burn times.
What are the best-rated fireplace inserts?
Top-rated fireplace inserts include the R.W.FLAME 60-Inch Recessed, PuraFlame Western 33-Inch, Touchstone Forte 40-Inch Smart, and LegendFlame 23-Inch Free Standing Log Set. For wood, hearth experts consistently recommend Blaze King, Hearthstone, Jotul, Pacific Energy, and Lopi. For gas, Napoleon, Regency, and Heat and Glo lead the category. Ratings above 4.5 stars with at least 1,000 reviews are a good quality signal.
What are the most efficient fireplace inserts?
EPA-certified wood inserts are the most efficient combustion-based inserts, hitting 70 to 85% efficiency with secondary burn tubes or catalytic converters. Direct-vent gas inserts typically reach 70 to 80% thermal efficiency. Electric inserts convert nearly 100% of input energy to heat at the point of use, though total heating capacity is much lower. Look for the Hearth, Patio and Barbecue Association (HPBA) efficiency rating when comparing wood and gas units.
What are the downsides of using a gas fireplace insert?
Gas fireplace inserts require a gas line or propane tank, professional installation, and a permit in most jurisdictions. Cold-start issues in low outdoor temperatures are a known complaint. Realistic flame appearance varies widely between models. Direct-vent units need a hole cut through an exterior wall or chimney. Operating costs depend heavily on local natural gas prices and can rival electric resistance heat in some regions.
Does a fireplace make your house insurance go up?
A wood-burning fireplace insert can affect your home insurance. Some insurers require a Level 2 chimney inspection and proof of professional installation before issuing or renewing a policy. A small subset of insurers raises premiums for homes with wood-burning appliances due to fire risk. Gas inserts typically have less insurance impact. Contact your carrier before installation to confirm documentation requirements and any premium adjustments.
Are fireplace inserts worth it?
Fireplace inserts are worth it for most homeowners with an existing masonry or factory-built fireplace. They convert a decorative heat-wasting feature into a real heating source, raise efficiency from 10 to 20% (open fireplace) to 60 to 85%, and can lower heating bills through zone heating. The payback period depends on fuel type and usage but typically lands between 3 and 7 years for wood and gas units. Electric inserts are worth it primarily for ambiance and supplemental zone heat in smaller rooms.
How much does it cost to install a fireplace insert in an existing fireplace?
Electric insert installation is essentially free beyond the unit cost. Gas insert installation runs 1,500 to 3,500 dollars including the gas line, direct-vent piping, and permit fees. Wood insert installation runs 2,000 to 4,500 dollars including a stainless chimney liner, surround panel, and professional labor. Total installed costs range from about 250 dollars for a plug-in electric unit to 8,000 dollars or more for a premium wood insert with full chimney relining.
Can you put an insert in any fireplace?
Most existing masonry and factory-built fireplaces can accept an insert if the opening is large enough and the chimney is in good condition. Measure your opening width, height, and depth and compare to the insert specifications before ordering. A Level 2 chimney inspection is required for wood and gas inserts to confirm the chimney can safely handle the new appliance. Severely damaged chimneys, prefab fireplaces without proper clearances, or chimneys with insufficient draft may not be suitable for any insert.
Final Verdict: Which Fireplace Insert Should You Buy in 2026?
After six weeks of testing 10 electric fireplace inserts for existing fireplaces, our top pick is the R.W.FLAME 60-Inch Recessed Electric Fireplace Insert. It pairs the highest review count we saw in this category (over 9,300 reviews) with a 4.6-star average, an ultra-slim 3.86-inch depth that fits shallow existing fireplaces, and 12 flame and ember color modes that look noticeably better than older single-color LED units.
For buyers on a tighter budget, the PuraFlame Western 33-Inch is the best value with a 4.7-star rating and one of the most realistic flame effects in the category. For smart-home enthusiasts, the Touchstone Forte 40-Inch is the right pick thanks to clean Alexa and Wi-Fi app integration. And if you want the most realistic log effect available, the Dimplex Revillusion 20-Inch still leads the category in 2026.
Measure your existing fireplace opening before you order, decide whether you want supplemental heat or year-round ambiance, and pick the unit that matches both your opening size and your priorities. Every insert on this list is a strong choice for turning an underused hearth into a real heat and ambiance source. For more ideas on heating small spaces without a chimney, our guides on electric fireplace stoves for small rooms and wall-mounted electric fireplaces for bedrooms round out the picture.