TL;DR
The right electric fireplace insert in this size class is the one that fits your opening and installation plan first, then delivers the flame look, controls, and noise level you can live with every day. For most homeowners, that means choosing a 120V unit with overheat protection, adjustable flame settings, and dimensions you’ve double-checked against both the visible surround and the rough-in cavity.
Top Recommended 36 Inch Electric Fireplace Inserts
| Product | Best For | Price | Pros/Cons | Visit |
|---|---|---|---|---|
| REMII DEEP | Built-in remodel projects | $900 – $1,500 | Purpose-built recessed fireplace line; confirm exact 36-inch fit before buying | Visit Remii |
| COSTWAY Electric Fireplace Inserts 33-inch Wide, 750W/1500W | Budget-conscious room heating | $175 – $200 | Strong buyer review volume for the price; not a true 36-inch front size | Visit Amazon |
Top Pick: Best Overall 36 Inch Electric Fireplace Inserts
REMII DEEP
Best for: homeowners building a recessed media wall or replacing an older built-in unit in a finished living room where a deeper firebox look matters more than bargain pricing.
The Good
- Purpose-built electric fireplace line that aligns well with built-in insert installations.
- Deeper visual design can suit buyers who want a more substantial recessed look rather than a flatter wall appliance.
- Good fit for remodels where hidden cord management and a cleaner permanent appearance matter.
- Works for shoppers comparing premium-style inserts instead of basic freestanding heaters with a flame effect.
The Bad
- You still need to verify the exact front width, rough opening, and cavity depth for the specific size you plan to order.
- Pricing can vary by configuration, so it may land above entry-level inserts.
- Professional planning is smart for a recessed build, especially if you want a hardwired look.
Our Take: This is the safest overall recommendation for a true built-in project because it is a dedicated electric fireplace product line, and for a homeowner finishing a media wall or upgrading a dated surround, that focus matters more than chasing the lowest sticker price.
COSTWAY Electric Fireplace Inserts 33-inch Wide, 750W/1500W
Best for: buyers in a condo, guest room, or smaller family room who want affordable supplemental heat and flame effects, and who can use a unit slightly under the nominal 36-inch class.
The Good
- Affordable price range compared with many recessed electric fireplace options.
- 750W/1500W operation fits the common 120V supplemental-heater format most buyers expect.
- High buyer review count suggests this is a common, widely purchased option.
- Good fit for shoppers who care more about basic heat and ambiance than premium built-in styling.
The Bad
- At 33 inches wide, it is not the right answer if your surround truly needs a 36-inch face or a matching trim profile.
- Budget models can be less refined in flame depth, trim finish, and control feel.
- You should confirm recess depth, cord routing, and clearance details before installing it into a finished wall.
Our Take: If your opening has some flexibility and your goal is straightforward 120V heat with a flame display at a lower cost, this is the value pick — but it is not the one we’d choose for a strict 36-inch replacement job.
How to choose the best 36 inch electric fireplace insert
The biggest mistake buyers make is assuming every “36-inch” electric fireplace insert shares the same dimensions. It usually does not. In this category, the label often refers to a nominal class rather than one universal front width, and the visible trim size can differ from the chassis size that actually slides into the cavity.
Before you compare flame colors or remotes, measure three things:
- The visible opening at the front.
- The internal cavity width and height.
- The available depth behind the surround or inside the wall.
That matters because some inserts need more trim overlap at the front, while others need more depth behind the face. If you are working with an existing mantel, stone surround, or entertainment wall, even a small mismatch can turn a simple install into a return.
Installation style is the next filter. Some units are easier to live with because they plug into a nearby outlet, while others are better for a cleaner built-in look when you are already remodeling. If you want the fireplace recessed into framing or cabinetry, follow the manufacturer’s instructions and treat electrical planning seriously. The NFPA 70 National Electrical Code is the right authority for safe wiring practices, and a licensed electrician can tell you whether your planned outlet location, cord routing, or hardwired setup is appropriate.
Heat output is another area where marketing can confuse buyers. Most 120V electric fireplace inserts operate in the same general supplemental-heating range because standard household circuits limit how much power they can draw. In plain terms, these are usually zone heaters, not replacements for central HVAC. The U.S. Department of Energy’s consumer heating guidance points to the same broader reality with electric resistance heat: expect dependable spot heating, but not whole-house performance. That’s why we tell buyers to focus less on tiny claimed BTU differences and more on fit, controls, and flame quality.
Flame realism varies more than heating power. This is where homeowner reports tend to be most useful. Some units look convincing in a dark TV room but washed out in daylight. Others have better ember bed detail, better brightness range, or more believable flame movement even with the heater off. If you plan to use the fireplace year-round, flame-without-heat mode matters a lot more than shoppers sometimes realize.
Daily convenience features also affect long-term satisfaction:
- Remote responsiveness
- Thermostat controls
- Timer functions
- Accessible onboard controls
- Fan noise during heating mode
Buyer reviews often mention noise and control quality long before they mention wattage. That lines up with common sense. A slightly prettier flame will not make up for a fan that’s too noticeable in a bedroom or media room.
Finally, check safety. Look for overheat protection and follow all recessed-install guidance from the manufacturer. For a finished wall, built-in cabinet, or mantel retrofit, safety listing and installation instructions matter more than decorative extras. We also recommend checking the CPSC product recalls page before purchase if you’re considering an older or heavily discounted model, especially from a marketplace listing.
If you are comparing broader appliance efficiency standards while shopping for other electric home upgrades, the ENERGY STAR certified products database is a useful reference point, though decorative electric fireplaces are not the same type of product category as HVAC equipment or major appliances.
FAQ
What does 36 inch mean on an electric fireplace insert?
Usually, it means the product belongs to a nominal size class, not that every dimension is exactly 36 inches. One model may have a front trim close to 36 inches, while another may need a different rough-in width, height, or depth behind the wall. Always compare the visible face size and the installation cutout separately before you order.
Can a 36 inch electric fireplace insert heat a living room?
It can often provide useful supplemental heat for part of a living room, den, or bedroom, but most 120V models are not meant to replace central heating. Evidence from the U.S. Department of Energy on electric heating suggests expectations should stay realistic: these products are best for zone heating and comfort, not whole-home output. In practice, many buyers use them for ambiance most of the time and for a warmth boost when seated nearby.
Do all 36 inch electric fireplace inserts plug into a standard outlet?
No. Many do, but some recessed units are better suited to a planned built-in installation, and some homeowners prefer a cleaner hardwired look during a remodel. Check the product instructions first, and if you’re building into framing or a media wall, have a licensed electrician review the plan against the NFPA 70 National Electrical Code.
Can you run the flames without heat?
Many electric fireplace inserts do allow flame-only operation, and that is one of the most useful features in this category. It lets you use the fireplace for ambiance in spring and summer without adding heat to the room. If year-round visual use matters to you, make sure the model you choose clearly supports this mode.
Are recessed electric fireplace inserts safe in built-ins or media walls?
They can be, provided the product is intended for that use and the installation follows the manufacturer’s clearance and ventilation guidance. Overheat protection and a recognized safety listing are worth prioritizing. For custom cabinetry, finished walls, or an old mantel conversion, it’s wise to involve a licensed electrician and, if needed, a finish carpenter so the electrical and clearance details are handled correctly.
What features make one model feel higher-end?
Usually it is not raw heat output. Higher-end units tend to separate themselves with better flame realism, a more convincing ember bed, quieter fan behavior, more precise controls, and a cleaner built-in presentation. In homeowner reports, those details affect satisfaction more than small differences in claimed heating numbers.
Is a deeper firebox better than a shallow insert?
Not always, but it can look more convincing in a recessed installation. A deeper unit may create a stronger built-in effect and more visual depth in the flame bed, which is why some remodelers prefer it for a media wall or formal living room. The tradeoff is that deeper units can be harder to fit into tight cavities or old surrounds with limited depth.
Should I choose based on BTUs or on installation fit?
Choose based on installation fit first. In this product class, many 120V units land in a similar practical heating range, so the better buying decision usually comes down to proper dimensions, safe installation, controls, flame quality, and acceptable noise. If the insert does not fit your opening correctly, the rest of the feature list does not matter.
Bottom Line
The best choice for most buyers is the model that matches the opening, supports the installation style you want, and delivers reliable everyday use rather than flashy heating claims. Among the options here, REMII DEEP is our top pick because it is the strongest fit for homeowners planning a true built-in electric fireplace installation with a cleaner, more intentional finished look. If you are shopping on a tighter budget and can work with a slightly smaller unit, the COSTWAY can still make sense as a basic supplemental-heating option.
Affiliate disclosure: We may earn affiliate commissions from qualifying purchases. This doesn't influence our reviews.
