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That old wood-burning or gas fireplace you haven’t lit in years? An electric insert turns it into a cozy, usable feature you will actually turn on — no chimney cleaning, no gas bills, no ash. The challenge is finding one that fits your opening exactly, throws enough heat for your room, and has flames realistic enough to fool your guests. Here is the short answer: the electric fireplace insert for existing fireplace worth buying is the RICHFLAME 33 Inches Edward for its authentic built-in look and strong owner satisfaction. For a tight media-cabinet fit, the Innoflame 23″ gives you a precise drop-in at 19 pounds. And for the most professional-grade finish, the LegendFlame Carl 28″ includes a trim kit that covers gaps for a smooth install.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
All the electric fireplace insert for existing fireplace picks here focus on fit, realistic flame quality, and real-world heat output that owners consistently praise.
Our Picks at a Glance
How To Choose The Best Electric Fireplace Insert For Existing Fireplace
Buying an electric fireplace insert is simpler than a gas conversion, but fit is everything. An insert that is too small leaves ugly gaps around it; one that is too wide simply will not go in. Get these three factors right before you click buy.
Measure Your Opening Three Ways
You need the width, height, and depth of your existing fireplace box. Write down the tightest spot on each side — an eighth of an inch can make the difference between a flush fit and a return. Most inserts list a “furniture front opening” size (the front dimension the trim covers) and a “rear opening” minimum (the actual firebox size). Compare those numbers against your own tape measure. For example, the RICHFLAME at 35 inches wide fits only generous masonry hearths, while the 23-inch Innoflame slides into entertainment-center-sized cavities.
Heat Output and Room Size
An electric insert provides supplemental heat, not primary furnace-level warmth. Most models cover 400 square feet with 5,000 BTUs (British Thermal Units, the standard measure of heat output) or about 1,500 watts (the electrical power it consumes). If your living room is open-concept or has vaulted ceilings, look for the higher end of that range — the Signature Design by Ashley claims 1,000 square feet of coverage with its 1,500-watt infrared element (a type of heater that warms objects and people directly). For a small bedroom or den, even a 750-watt setting on a 1,400-watt unit will take the chill off.
Flame Realism vs. Sound Quality
The visual effect is what you look at all winter. Inserts with resin logs (molded synthetic logs that look real), glowing ember beds, and multi-color LED (light-emitting diode) flames produce the most convincing fire — guests often ask if it is gas. The crackling sound, however, is the most divisive feature. Many owners turn it off immediately because reviewers describe it as sounding like crumpling foil or static radio. A good unit lets you run the flame with zero sound, so the speaker quality matters only if you want ambient noise.
Quick Comparison
| Model | Best For | Wattage | Heating Coverage | Item Weight | Amazon |
|---|---|---|---|---|---|
| RICHFLAME 33″★ Best Overall | Large open masonry hearths | 750/1500W | 400 sq ft | 55.8 lb | Amazon |
| Innoflame 23″Compact Fit | Entertainment center replacement | 1400W | 400 sq ft | 19 lb | Amazon |
| duraflame Log Set | Quick log-set upgrade | 5200 BTU | 1,000 sq ft | 19.4 lb | Amazon |
| PuraFlame 27″ | Colorful ambient flames | 750/1500W | 400 sq ft | 18.3 lb | Amazon |
| Masarflame 30″ | Retro brick-style look | 750/1500W | 400 sq ft | 42.3 lb | Amazon |
| Signature Design by Ashley | Large-room infrared warmth | 1500W | 1,000 sq ft | — | Amazon |
| LegendFlame Carl 28″ | Premium trim-kit finish | 750/1500W | 400 sq ft | — | Amazon |
In‑Depth Reviews
1. RICHFLAME 33 Inches Edward Electric Fireplace Insert
Our pick — over 4.5★ from 500+ verified ratings; the strongest balance of quality and price.
Gives you the most authentic built-in look, thanks to a weathered concrete interior and a 55.8-pound build that feels like a permanent renovation
This insert’s 35-inch width aims at a real masonry hearth, not a media console. The 5,000 BTU (British Thermal Unit) output, which is about 1,500 watts at max, warms a 400-square-foot room. Two heat settings let you run 750W for mild days or 1,500W when you need real warmth. Reviewers report the crackling sound is weak — “not great speaker sound of fire” is a common note — but you can turn it off and still enjoy the three-stage LED (light-emitting diode) flame display that varies the burn pattern to look more like an actual fire.
The weathered concrete interior gets consistent praise from owners for looking “classy” and far more premium than standard painted black finishes. The remote control adjusts the 750/1500W heat or flame intensity from the couch. At 8.8 inches deep, it needs a reasonably deep fireplace chamber, so measure your opening depth before ordering. Buyers report the dimensions are accurate and the packaging is solid.
A few buyers mention the fit is perfect for replacing a wood-burning unit, but note the heater struggles to warm a very large room. The speaker quality for the crackling effect is a trade-off — treat it as a nice-to-have you will likely silence, not a primary feature. This insert is for you if you have a wide masonry hearth (at least 35 inches) and want a premium built-in appearance. skip it if your fireplace opening is shallower than 8.8 inches or you want a lightweight unit you can move between rooms.
Why owners choose it
- Weathered concrete interior looks far more premium than standard painted finishes
- Two heat settings (750/1500W) let you save energy on mild days
- Three-stage flame display creates a realistic, varied burn pattern
- Reviewers report five-star build quality with solid packaging and accurate dimensions
Real-world trade-offs
- Crackling sound quality is weak; most owners leave it off
- At 55.8 pounds it is heavy — you will need help getting it into the fireplace opening
- Requires a 6-foot power cord on the right side, which limits placement options
Reach for this if: you have a wide masonry hearth (at least 35 inches) and want an insert that looks built-in with a premium concrete interior.
Look elsewhere if: you need a lightweight unit you can move between rooms or your fireplace opening is shallower than 8.8 inches
2. Innoflame 23″ Electric Fireplace Insert
Slides into tight entertainment centers and media cavities at just 19 pounds, making it the shallowest and lightest drop-in replacement of this group
At 5 inches deep, this is the shallowest unit here — a 2.2x depth advantage over the duraflame log set — so it fits cavities that reject deeper inserts. The 1,400-watt heater covers 400 square feet with a built-in thermostat (a device that lets you set and maintain a specific room temperature) you can set from 64°F to 82°F. Four flame brightness levels let you dial the ambiance from a subtle glow to a bright fire. Owners mention the flames look more realistic than the original unit it replaced, and many say “the measurements were EXACT” for a true flush, built-in look.
The remote control works well and the low noise level gets a lot of positive attention — owners describe it as “very quiet.” The safety package includes overheat protection (auto shutoff at high temperatures) and a cool-to-touch tempered glass front, so it is safe near kids and pets. At just 19 pounds, one person can easily slide it into place — unlike the 55.8-pound RICHFLAME above. The 8-hour timer is a thoughtful touch for overnight use without wasting energy. The honest limitation is the 23-inch width and specific rear-opening requirement (24 inches minimum). This insert mounts from behind the furniture, not the front, so measure carefully. This is your pick if you have a 23-inch wide opening with at least 5 inches of depth and want a no-gap replacement. Skip it for a wide masonry hearth where the 23-inch width would look lost.
Clear choice for: replacing a dead electric insert in a TV stand or media console where shallow depth and exact fit matter most.
Your move if: you have a 23-inch wide opening with at least 5 inches of depth and want a no-gap replacement that is whisper-quiet and heats well.
Skip it for: a wide masonry hearth where the 23-inch width would look lost in a large opening.
3. duraflame Electric Log Set 1,000 Sq Ft Heater
Delivers the highest heat output at 5,200 BTU with infrared (object-warming) heating, and you just place it in your hearth — no mounting required
Unlike full-frame inserts, this is a log set you simply place into your existing hearth — no screws, no trim kit. It is 11.06 inches deep (the deepest unit here by a notable margin), so it suits a roomy firebox. Its 5,200 BTU (British Thermal Unit) heater, which outpaces the RICHFLAME’s 5,000 BTU, claims coverage for up to 1,000 square feet. The infrared quartz (a type of heating element that glows and warms objects directly) heating element feels more natural than hot-air blasts because it warms you and the furniture, not just the air. Customers note it helped heat a 600-square-foot space with vaulted ceilings, and guests often thought it was a real gas fire. The remote controls the digital thermostat (a temperature control you set digitally), flame speed, and brightness independently, so you can run the glow year-round without heat.
The rustic pine finish gives the logs a realistic, charred-wood look when the unit is off — a design detail that matters if you do not want a black void in your hearth during summer. Many reviewers point out it reduced their heating bills by warming only the occupied room instead of the whole house. Appearance and heat output are the top two aspects owners mention, tied with 35 count each.
The catch is the noise level. The heater blower has a low hum that some owners find background-level and others notice. The remote’s LED (light-emitting diode) display projects settings on the fireplace back wall, which is clever but can be hidden if you push the logs flush against the back. It needs an outlet within 6 feet, so plan your cord routing. This is the easiest setup possible — place it, plug it, enjoy — but if you want a flush, built-in appearance, this sits on the hearth floor and does not look like a framed insert.
Best for: people who want a no-install upgrade that actually heats a sizable room and looks like real charred wood.
Reach for it if: you want the easiest possible setup — place it, plug it, enjoy — and your fireplace opening is at least 11 inches deep.
Think twice if: you want a flush, built-in appearance; this sits on the hearth floor and does not look like a framed insert.
4. PuraFlame 27″ Free Standing Electric Fireplace Log Set
Gives you six flame colors and five brightness levels for a customizable ambiance that the RICHFLAME’s standard orange flame cannot match
If you want more than orange flames, this log set delivers six flame colors and five brightness settings, letting you match the mood from a warm amber to a cool blue or purple glow. At 18.3 pounds and 27 inches wide, it fits most standard fireplace openings and sits on the hearth floor with no installation required. The 750/1,500W (watt) heater can run with or without the flame, and the thermostat adjusts from 60°F to 82°F with a timer ranging from 0.5 to 9 hours. The LED (light-emitting diode) display shows every setting clearly, and the crackling sound adds to the vibe — though owners note the popping gets loud at levels four and five, and the remote range is limited, requiring you to stand near the unit. Appearance is the top praised aspect by a wide margin, and the quiet heater fan earns strong positive mention from owners who dislike noisy fans.
The realistic log set and ember bed draw compliments, and the 1,500W mode throws enough warmth for a 400-square-foot room. Shoppers say it fits spaces as narrow as 24 inches wide and 20 inches tall, making it versatile for smaller hearths that cannot take a 33-inch unit. The one-year warranty covers defects, and the LED bulbs cost pennies per day to run without the heater on. The honest downside is the heat output — owners describe it as “not much heat,” and the manufacturer states it is not a primary heat source. The crackling sound at higher levels can be too sharp for some people and for pets; one owner noted their dog did not like it. You can turn the sound off and still enjoy the colored flames. This is a decorative hearth option first and a heater second.
Standout strengths
- Six flame colors with five brightness levels for total ambiance control
- Very quiet heater fan — owners specifically praise the low noise
- Easy freestanding setup with thermostat and programmable timer
What to know
- Heat output is modest; this is for ambiance first, warmth second
- Remote range is short — you may need to stand up to change settings
- Crackling sound at higher levels can sound unnatural or bother pets
Grab this for: a decorative hearth where you want colorful, adjustable flames and a quiet heater fan for mild supplemental warmth.
Choose another if: you need serious heating power for a cold room or want a flush built-in look rather than a freestanding log set.
5. Masarflame 30” Electric Fireplace Insert
Puts a three-sided brick interior into your fireplace for an old-world masonry feel that painted black inserts like the Innoflame cannot deliver
This unit stands out with its three-sided interior brick wall design, giving a retro hearth feel that painted black inserts cannot match. At 30.5 inches wide and 8.84 inches deep, it fits standard hearth openings. The 5,100 BTU (British Thermal Unit) heater offers 750W and 1,500W settings for energy-conscious use. The resin logs (molded synthetic logs) and ember bed look realistic, and five variable flame intensity levels let you dial the fire from a flicker to a full blaze. The built-in crackling sound speaker is a mixed bag — owners describe it as “like static radio” or “crumpling foil” — but the flame effect itself earns strong praise for realism. Appearance is the top aspect owners praise, and heat output is the second most-discussed strength.
The 42.3-pound weight makes it a two-person job to fit into the fireplace, but once in place it looks substantial and well-proportioned. The included remote controls the thermostat and timer, and the front air vent directs heat upward into the room rather than out the back. Buyers in RVs and fifth-wheel trailers specifically praise the perfect fit and the visual upgrade over standard RV fireplaces. The power cord exits on the right side, which some owners had to account for by drilling a small access hole. The main caveat is the sound quality — the crackle effect is widely described as unconvincing, and most owners leave it off. The heat output is sufficient for a small to medium room, not a large open-plan space. This is for you if you prioritize the realistic brick interior and flame visuals over crackling sound quality. Pass if you need a lightweight unit or a deep enough fireplace to hide the right-side power cord neatly.
Ideal for: anyone with an older or retro-styled fireplace who wants the brick-look interior to match the home’s character.
This is your insert if: you prioritize the realistic brick interior and flame visuals over crackling sound quality.
Pass if: you need a lightweight unit, a convincing fire sound, or a deep enough fireplace to hide the right-side power cord neatly.
6. Signature Design by Ashley Infrared Fireplace Insert
Claims the largest coverage in the lineup at 1,000 square feet, using infrared (object-warming) heat that feels more natural than the RICHFLAME’s fan-forced air
This is the largest coverage claim in the lineup — 1,000 square feet from a 1,500-watt infrared element producing 5,386 BTUs (British Thermal Units). Infrared heat warms objects and people rather than just the air, so the room feels comfortable without the dry, stuffy feeling of forced-air heaters. The faux firebrick surround and dynamic glowing ember bed create a dimensional, authentic fireside look that extends beyond just the log set. Owners consistently say it looks realistic and creates “wonderful atmosphere,” with the black firebrick contrasting beautifully against white or light-colored media consoles. Five flame brightness levels and independent flame control let you run the visual show year-round without any heat on.
The remote includes a seven-level temperature setting and a timer programmable from 10 minutes to 9 hours, giving you fine control over your comfort. The unit measures 31.25 inches wide and 8.75 inches deep, designed to fit Signature Design by Ashley media consoles, but buyers report it slides perfectly into other compatible openings too. The heater fan is described as “very quiet” and the safety shutoffs give confidence for unattended use. Owners note it warms a 400 to 600-square-foot zone comfortably, and the infrared element does not dry out the air like quartz heaters can. The honest limitation is the minimum heat setting — it starts at 71°F, which may be too warm for some users who only want a slight chill taken off. This works best as supplemental heat for a large living area or open-concept space, but consider alternatives if you need a lower minimum heat setting or a shallower depth than 8.75 inches.
Best suited for: larger rooms where infrared’s object-warming effect makes a real difference in comfort without drying the air.
Pick this if: you have a large living space or open floor plan and want infrared heat that feels more natural than a fan-forced heater.
Consider alternatives if: you need a lower minimum heat setting or your fireplace opening is shallower than 8.75 inches.
7. LegendFlame Carl 28 Inches with Trim Kit
Delivers a professional-grade, built-in look with an included trim kit that covers gaps, plus nine mood lights for a flame effect that rivals the RICHFLAME’s realism
This is the unit you buy when you want the install to look like a contractor did it, not a weekend DIY project. The included trim kit covers gaps up to 37.7 inches wide and 25.8 inches tall, giving a clean, finished edge around your fireplace opening. The 28-inch insert itself features a three-sided interior brick wall and a sleek glass front, with nine mood light settings that shine down on the resin log (molded synthetic log) to create a dramatic, multi-dimensional flame effect. The flame has four brightness settings with a larger, more random burn pattern than basic units, so it actually looks like a real fire flickering, not a repetitive loop. Owners describe the appearance as “the best-looking large electric insert” and say guests are surprised it is not gas. Quality is the second most-discussed aspect, with owners specifically praising the build materials and high-end aesthetic.
The heater runs at 750W or 1,500W with an adjustable thermostat and covers up to 400 square feet as supplemental heat. The crackling sound is better-reviewed than on many competitors — it is one of the few models where owners do not automatically mute it. The remote controls everything: flame brightness, heat level, mood lights, and crackling sound, letting you create different scenes for movie night or a quiet evening. Installation is flexible — you can set it freestanding on the hearth, insert it flush into an opening, or recess it into the wall if you have a flat bottom. The honest trade-off is that like all electric inserts, it is not a primary heat source for a whole house. The 10.4-inch depth means it needs a reasonably deep fireplace cavity, though the trim kit helps cover any minor fit gaps. The mood lights and multiple flame settings add complexity that some owners simply set once and never touch again — but for those who enjoy customizing the ambiance, it is a premium experience. This is a showpiece installation where the trim kit covers uneven openings; opt for something simpler if your fireplace opening is shallower than 10 inches.
What makes it special
- Included trim kit delivers a professional, gap-free built-in appearance
- Nine mood light settings create a dramatic, multi-dimensional log display
- Larger, more random flame pattern looks more realistic than basic inserts
- Three installation options: freestanding, flush insert, or recessed mount
Things to consider
- 10.4-inch depth requires a deeper fireplace cavity than shallow inserts
- Heater is supplemental only — not enough for whole-home warmth
- Multiple settings can feel like overkill if you just want a simple flame
Choose this for: a showpiece installation where the trim kit covers uneven openings and you want the most realistic, customizable flame effect available.
Opt for something simpler if: your fireplace opening is shallow (under 10 inches) or you prefer a low-maintenance approach to ambiance.
Understanding the Specs
BTU vs. Wattage
BTU (British Thermal Unit) measures heat output — the higher the number, the more warmth the insert produces. Most electric inserts in this guide run between 5,000 and 5,400 BTU, which is enough to supplement a 400-square-foot room. Wattage is the electrical consumption: 1,500 watts is about what a standard space heater draws. Lower wattage (750W) is for energy-saving use on cool spring or fall days. The duraflame log set delivers 5,200 BTU, while the Signature Design by Ashley pushes to 5,386 BTU for its larger coverage claim. Neither is a furnace replacement, but both take the edge off a cold room.
Flame Realism: Colors, Brightness, and Logs
Not all flame effects are equal. Budget models show a repetitive orange flicker; premium units like the LegendFlame Carl use multiple LED (light-emitting diode) colors, random burn patterns, and resin logs (molded synthetic logs that look real when the unit is off). Brightness levels (typically 3 to 7) let you dim the fire for a subtle glow or turn it up for a bold centerpiece. Some inserts also include color-changing modes — the PuraFlame offers six flame colors — which is great for ambiance but less realistic than a standard orange-and-yellow mix. The interior finish matters too: a three-sided brick wall (Masarflame, LegendFlame) or weathered concrete (RICHFLAME) adds depth when the fire is on and looks good when it is off.
FAQ
Can I use an electric fireplace insert in a non-working wood fireplace?
Do I need to vent an electric fireplace insert?
How do I measure my fireplace for an insert?
Will an electric fireplace insert reduce my heating bill?
Can I run the flame without the heat?
How realistic is the crackling sound on these inserts?
How much clearance does an electric insert need around it?
Can I hardwire an electric fireplace insert?
Is an electric fireplace insert safe to leave on overnight?
What is the difference between infrared and quartz heating elements?
Final Thoughts: The Verdict
If you want one dependable pick, the electric fireplace insert for existing fireplace winner is the RICHFLAME 33 Inches Edward because it delivers the most authentic built-in look with its weathered concrete interior and has the highest owner satisfaction in its size class. If you need a lightweight, precise drop-in replacement for a media cabinet, the Innoflame 23″ is the easiest fit at 19 pounds. And for the absolute best visual realism with a professional-grade finish, the LegendFlame Carl 28″ with its included trim kit and nine mood lights turns your old fireplace opening into a showpiece.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.