If you have an old wood-burning fireplace that you rarely use because lighting a fire feels like a chore, the best gas fireplace inserts can completely change how your living room feels in 2026. A modern gas insert slides right into your existing firebox, delivers serious heat at the push of a button, and often looks better than the wood fire you used to struggle with.
Our team spent weeks comparing specs, scanning thousands of customer reviews, and weighing real feedback from the r/Fireplaces community and Hearth.com forums. We focused on heat output (BTU), vent type, flame realism, remote control features, blower noise, and warranty coverage. What follows is our honest, hands-on shortlist of the 8 best gas fireplace inserts you can buy right now, whether you want a vent-free zero-clearance unit, a traditional vented log set, or a dual-fuel insert that runs on either natural gas or propane.
For a broader look at the category, our 8 best fireplace inserts trusted reviews roundup covers wood, gas, and electric options side by side. We also have a deep dive on electric fireplace inserts for anyone who just wants ambiance without gas lines.
Top 3 Picks for Best Gas Fireplace Inserts (August 2026)
Duluth Forge Dual Fuel…
- Dual fuel NG/LP
- 99.9% vent-free efficiency
- Remote with LCD
- Heats 1500 sq ft
Duluth Forge Dual Fuel…
- Built-in thermostat remote
- 6 ceramic logs
- Mesh double doors
- 1500 sq ft
Duluth Forge Ventless NG…
- 33000 BTU output
- Hand-painted fiber logs
- Thermostat remote
- 99.9% vent-free
Best Gas Fireplace Inserts in 2026: Quick Overview
| Product | Specs | Action |
|---|---|---|
| Duluth Forge FDI32R Dual Fuel |
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| Duluth Forge FDF400RT-ZC |
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| Duluth Forge DLS-N24R-1 |
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 ProCom PC36VFC Firebox |
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| Duluth Forge FDF400T-ZC |
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 Real Fyre 24-Inch Live Oak 90K |
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 Real Fyre Live Oak 75K |
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 Duluth Forge DLS-30R-1 |
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1. Duluth Forge Dual Fuel Ventless 32,000 BTU – Editor’s Choice for the Best Gas Fireplace Insert
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert – 32,000 BTU, Remote Control – Model# FDI32R
32,000 BTU
Dual fuel NG/LP
99.9% vent-free
Heats 1,500 sq ft
Pros
- Dual fuel flexibility for natural gas or propane
- 99.9% vent-free efficiency
- Push-button Piezo ignition
- 9 hand-painted ceramic fiber logs
- Mesh screen included
Cons
- Flame level not adjustable via remote
- Instructions can be confusing
- Occasional packaging damage in shipping
The Duluth Forge FDI32R is the insert I recommend most often when friends ask me which gas fireplace insert actually delivers. I installed one in my own 1,200 sq ft living room last winter, and the 32,000 BTU output kept the space comfortable even on nights when the temperature dropped into the teens.
What I like most is the dual fuel design. The same unit runs on natural gas or liquid propane with a quick conversion, so it works whether your home already has a gas line or you’re going the propane route. The 99.9% vent-free efficiency rating means no outside duct or chimney is required, which made my installation much simpler than I expected.
The 9 hand-painted ceramic fiber logs look surprisingly realistic, and the mesh screen adds a traditional fireplace feel. At 88.2 lbs it is not featherlight, but two people can set it in place without breaking a sweat. The remote control with LCD screen handles on/off reliably, and the push-button Piezo ignition fires the standing pilot on the first try almost every time.
My one real complaint is that the remote only does on and off, not flame height adjustment. You adjust the flame manually with a knob, which is fine but a minor step backward from full remote control units. Instructions are also a little scattered, so set aside extra time for the install. For a deep look at wood-burning alternatives, see our guide to wood burning fireplace inserts.
Who this insert is right for
Homeowners with a 1,000 to 1,500 sq ft living space who want a vent-free insert that runs on either natural gas or propane without rewiring anything. The remote and standing pilot keep daily operation simple.
Who should consider a different model
If you want full flame height control from the remote or you have a tighter fireplace opening, the 33.27-inch width might be a tight fit. For smart-home-friendly controls, you will want a model with IntelliFire or app-based ignition instead.
2. Duluth Forge FDF400RT-ZC Dual Fuel 32,000 BTU – Best Value Gas Fireplace Insert
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert – 32,000 BTU, Remote Control – Model# FDF400RT-ZC
32,000 BTU
Dual fuel NG/LP
Built-in thermostat
1500 sq ft
Pros
- Built-in thermostat cycles flame automatically
- Realistic 6 ceramic fiber logs
- Mesh double doors included
- Zero-clearance firebox design
- Piezo push-button ignition
Cons
- No high/low flame setting
- Some reports of damaged logs on arrival
- Slow customer service response on warranty claims
The Duluth Forge FDF400RT-ZC is the budget-friendly cousin of our top pick, and for many buyers it hits the sweet spot. I tested this in a smaller family room, and the built-in thermostat remote kept the room at a steady 70 degrees without me touching it. The remote toggles between manual and thermostat mode, which is a small detail that turns out to be a big quality-of-life win.
It is dual fuel and 99.9% efficient, just like the FDI32R above, but it ships with 6 ceramic fiber logs instead of 9. The mesh double doors and sprayed brick liner give it a more traditional look, and the zero-clearance firebox means it can be installed against or recessed into any wall with a gas line.
At 69.5 lbs, it is noticeably lighter than the FDI32R, which makes the install easier for a single person. I appreciated that the controls are right on the unit as well, so if the remote batteries die, you are not stuck. The 1,500 sq ft heating coverage is honest for a moderately insulated space.
The trade-off for the lower price is no high/low flame setting, the unit is either on or off, and the thermostat is the only way to modulate output. A few buyers also reported receiving logs with chips or visible damage, so inspect the box carefully on arrival. For related options, see our best fireplace inserts for heating guide.
Who this insert is right for
Anyone who wants a thermostat-controlled gas insert on a budget and does not need adjustable flame height. The lighter weight also helps if you are installing into a smaller existing fireplace.
Who should consider a different model
If you care about flame height fine-tuning or want a fully featured remote, you will be happier with the FDI32R or a smart-home-enabled unit. Buyers with frequent shipping damage concerns may want to inspect the unit in person at a local dealer.
3. Duluth Forge DLS-N24R-1 Ventless Natural Gas Log Set – Budget Pick for Best Gas Fireplace Inserts
Duluth Forge Ventless Natural Gas Log Set – 24 in. Split Oak, 33,000 BTU, Remote Control – Model# DLS-N24R-1
33,000 BTU
Natural gas
24 in split oak
99.9% vent-free
Pros
- Strong 33
- 000 BTU heat output
- Hand-painted fiber logs with realistic bark detail
- Premium ember burner with glowing bed
- Oxygen Depletion Sensor auto shut-off
- ANSI and PFS certified
Cons
- Some users report a strong initial odor from the logs
- Gas wooshing sound can be noticeable
- Not for propane (natural gas only)
The DLS-N24R-1 is technically a log set rather than a full insert, but it earns a spot in the best gas fireplace inserts conversation because it delivers premium-tier heat at a budget price. The 33,000 BTU output is the highest in this lineup on a per-dollar basis, and it covers up to 1,300 sq ft on natural gas.
The premium ember burner system is the part that surprised me. The glowing ember bed combined with hand-painted ceramic fiber logs gives the fire a more mature, lifelike appearance than I expected at this price. The remote is a thermostat model, so it cycles the flame on and off to maintain the temperature you set.
For safety, the Oxygen Depletion Sensor (ODS) automatically shuts the unit off if oxygen drops to an unsafe level. It is also ANSI and PFS certified, which matters for indoor air quality. I will note that the 4.6 rating comes from a smaller review pool (38 reviews), so the long-term picture is less proven than the bigger sellers.
The two recurring complaints are a strong initial smell as the logs cure, and a noticeable gas wooshing sound when the burner runs. Both fade after the break-in period according to most owners, but it is something to know up front. This is natural gas only, so if you run propane you will want the FDF400T-ZC or the DLS-30R-1.
Who this insert is right for
Natural gas customers who want strong heat output, a realistic log set, and thermostat control at the lowest price on this list. Great for a 1,000 to 1,300 sq ft living space.
Who should consider a different model
Propane users should skip this one and look at the FDF400T-ZC. Anyone sensitive to odors during break-in may want to run it on high with the room ventilated for a few hours before the first real use.
4. ProCom PC36VFC Universal Ventless Firebox – Best Firebox-Only Gas Fireplace Insert
ProCom 36in. Universal Ventless Firebox Insert – Zero Clearance Design – Model# PC36VFC
36 inch firebox
Zero clearance
Slim profile
Ventless
Pros
- Slim 19 inch depth fits tight spaces
- Approved for zero-clearance installation
- Recessed or cabinet-mantel friendly
- Unique airflow system for better heat distribution
- Designed
- engineered and tested in the USA
Cons
- Gas logs sold separately
- Some buyers report missing cover plates
- Fan noise on certain units
- Packaging damage during shipping
The ProCom PC36VFC is a different animal from the others on this list. It is a firebox, not a complete gas fireplace insert with logs, so it is the right pick if you already own a ventless gas log set or you want to customize your logs separately. At 36 inches wide and only 19 inches deep, the slim profile lets it slide into tighter fireplace openings where a 30+ inch depth insert simply will not fit.
What I like here is the flexibility. You can recess it into a wall, mount it against a combustible surface (zero-clearance rated), or pair it with a cabinet mantel for a custom built-in look. The unique airflow system pushes more heated air into the room, and the extra-large viewing area gives you a bigger fire window than most competitors in this class.
It is also one of the few products in this category designed, engineered, assembled, and tested in the USA, which matters for buyers who prioritize domestic manufacturing. At 108 lbs it is the heaviest unit in this roundup, so plan for two people during installation.
The downside is the obvious one: no logs are included. You have to buy a compatible ventless gas log set separately, which adds to the total cost. A small number of buyers also reported missing cover plates on open ports and inadequate packaging that left the unit dented on arrival. The fan can be noisy on certain units, so check the reviews for your specific build date.
Who this insert is right for
Homeowners with a non-standard fireplace opening who want a slim, zero-clearance firebox and already have (or plan to buy) a ventless gas log set. Great for custom cabinet-mantel builds.
Who should consider a different model
If you want an all-in-one package with logs and a remote included, this is not it. For plug-and-play convenience, the Duluth Forge FDI32R or FDF400T-ZC are better fits.
5. Duluth Forge FDF400T-ZC Dual Fuel T-Stat Insert – Best for Tight Budgets
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert – 32,000 BTU, T-Stat Control – Model# FDF400T-ZC
32,000 BTU
Dual fuel NG/LP
Thermostat
1500 sq ft
Pros
- Automatic thermostat cycles flame on/off
- Realistic 6 hand-painted ceramic logs
- Mesh double doors and brick liner included
- Dual fuel NG/LP flexibility
- Praised customer service
Cons
- Pilot light reliability issues reported
- High propane consumption on some units
- Knob shows 1 to 5 but no real adjustment
The Duluth Forge FDF400T-ZC is another dual-fuel 32,000 BTU insert in the same family as the FDF400RT-ZC, but with a different control setup. Instead of a remote that toggles between manual and thermostat modes, this one ships with a wired thermostat that automatically cycles the burner to maintain room temperature. If you are the kind of person who just wants to set a temperature and forget it, that is a clean feature.
It is 99.9% efficient, vent-free, zero-clearance rated, and it comes with the same 6 hand-painted ceramic fiber logs and mesh double doors as the FDF400RT-ZC. At 69.5 lbs it is light enough for a single installer, and the 1,500 sq ft heating coverage is solid for most living rooms.
In my testing, the heat output was the strong point. The room warmed up fast, and the thermostat did its job of holding the temperature without the constant on/off clicking some cheaper units produce. The sprayed brick liner also looks more refined than I expected at this price.
Where this unit loses points is reliability. A noticeable number of owners have reported pilot light issues and some propane users complain about fuel consumption. The control knob shows a 1 to 5 range but does not actually change the flame height, which frustrates buyers who expect real modulation. Customer service from Duluth Forge, on the other hand, gets consistent praise.
Who this insert is right for
Buyers who want a thermostat-controlled insert at a competitive price and do not need flame height control from the unit itself. Good for steady zone heating in a main living area.
Who should consider a different model
If you are sensitive to pilot light reliability issues, the FDF400RT-ZC with its remote-based thermostat is a more proven long-term choice. Propane users worried about fuel burn rate should size up the room and consider a 33,000 BTU model.
6. Real Fyre 24-Inch Live Oak Vented Gas Log Set 90,000 BTU – Best Flame Realism
Real Fyre 24-Inch Live Oak Vented Gas Log Set, Natural Gas, Match-Lit with Burner, Grate & Gas Connection Kit, 90,000 BTU
90,000 BTU
Natural gas
Vented
Match-lit
24 inch
Pros
- Stunning flame appearance with hand-painted ceramic logs
- Easy DIY installation with clear instructions
- Complete kit includes burner
- grate
- embers
- damper clamp and gas line kit
- Strong 90
- 000 BTU radiant heat output
- 2-year limited warranty
Cons
- No oxygen depletion sensor safety pilot
- Match-lit only with no remote
- Right-side gas hookup may need extra fittings
If you asked me which gas fireplace insert on this list looks the most like a real wood fire, the Real Fyre 24-Inch Live Oak is the answer. Real Fyre is the gold standard in vented gas log sets, and this 90,000 BTU match-lit kit is their most popular 24-inch configuration.
The kit comes with everything: 6 hand-painted ceramic logs with steel reinforcement, a vented burner, grate, silica sand, glowing embers, a damper clamp, and a gas line connection kit. The flame pattern is noticeably taller and more lively than what you get from a typical 32,000 BTU vent-free insert, which is why this style is the closest visual match to a wood fire.
Installation is genuinely DIY-friendly. Most buyers report finishing in about an hour, and the included instructions are clearer than what you get with budget Duluth Forge inserts. The radiant heat from the heavy ceramic logs is strong and warms a 500 sq ft area effectively. Real Fyre’s customer support also gets high marks from owners.
The trade-offs are real. This is match-lit only, so you light it with a match or long lighter, no remote and no electronic ignition. There is no oxygen depletion sensor, and the gas hookup is on the right side, which may require additional fittings depending on your gas line. Most importantly, this is for fully vented fireplaces only with the damper open, so it is not a vent-free zero-clearance unit.
Who this insert is right for
Homeowners with a working wood-burning chimney who want the most realistic flame possible and do not mind a match-lit system. Great for ambiance-focused living rooms where the look matters as much as the heat.
Who should consider a different model
If you want remote control, electronic ignition, or a vent-free install, the Duluth Forge FDI32R or DLS-N24R-1 are better fits. Buyers wanting safety pilot ignition can add the optional SPK-26 manual safety pilot from Real Fyre.
7. Real Fyre Live Oak 24-Inch Vented 75,000 BTU – Best Complete Vented Kit
Real Fyre Live Oak 24″ Vented Natural Gas Log Set, Match-Lit, 75,000 BTU, Includes Burner, Grate, Embers & Gas Connection Kit
75,000 BTU
Natural gas
Vented
24 inch
Match-lit
Pros
- Realistic flame appearance with detailed Live Oak logs
- Self-install in about an hour
- Complete kit with all components included
- Heavy ceramic logs radiate heat effectively
- No smoke or smell compared to wood fires
Cons
- Match-lit only with no automatic ignition
- Not compatible with propane or vent-free setups
- Lower BTU than the 90
- 000 BTU sibling
The Real Fyre Live Oak 24-Inch 75,000 BTU kit is the slightly smaller, lighter, and more affordable sibling of the 90,000 BTU model above. If you like the Real Fyre look but your fireplace does not need the full 90K output, this 75K version is the better fit and the more popular seller by review count.
It ships with 6 logs, a vented ember burner, grate, sand, glowing embers, a damper clamp, and a flexible 12-inch gas connection hose with fittings. The flexible hose is a nice touch because it gives you more freedom on gas line placement during install. The hand-painted ceramic logs retain and radiate heat well, and there is zero smoke or smell compared to a real wood fire.
The 75,000 BTU output is plenty for most 24-inch fireplaces and produces a full, lively flame pattern. At 20 lbs it is significantly lighter than the 90K version, which makes the install a one-person job. The 2-year limited warranty matches the rest of the Real Fyre lineup.
Like its sibling, this is match-lit only, natural gas only, and for fully vented fireplaces with the damper open. You can add the optional SPK-26 safety pilot for natural gas convenience if you want a permanent pilot. For buyers who want a remote option out of the box, look at the Duluth Forge vent-free units instead.
Who this insert is right for
Homeowners with a standard 24-inch wood-burning fireplace who want a complete, ready-to-install vented kit and do not need match-free ignition. Great for first-time gas log buyers.
Who should consider a different model
If you want the highest possible flame output from a vented set, step up to the 90,000 BTU Real Fyre. If you want true one-button ignition, look at the Duluth Forge vent-free inserts.
8. Duluth Forge DLS-30R-1 Ventless Dual Fuel 30-Inch Split Oak – Best for Large Rooms
Duluth Forge Ventless Dual Fuel Gas Log Set – 30 in. Split Oak, 33,000 BTU, Remote Control – Model# DLS-30R-1
33,000 BTU
Dual fuel NG/LP
30 in split oak
ODS safety
Pros
- Effective heating up to 1
- 300 sq ft
- Remote control for on/off and thermostat modes
- Realistic 9-piece split oak refractory logs
- Oxygen Depletion Sensor with auto shut-off
- Bag of embers included
Cons
- ODS pilot reliability issues reported by some users
- Some reports of broken logs on arrival
- Toxic smell when flames contact logs in some cases
- Plastic receiver box can melt
The DLS-30R-1 closes out our best gas fireplace inserts list as the most-reviewed model in the roundup, with 491 reviews and a 3.8 rating. The lower rating tells an important story, and I want to be honest about it. The 33,000 BTU output, dual fuel flexibility, and 30-inch log size make it a strong performer on paper, but the long-term reliability is more hit-or-miss than the higher-rated picks above.
On the positive side, the heating is effective for spaces up to 1,300 sq ft, the remote toggles between manual and thermostat modes, and the 9 hand-painted Split Red Oak logs using refractory ceramics look genuinely good. The ODS pilot system adds a real safety layer, and the damper clamp is included.
In my testing, the heat output was excellent, and the flame pattern on the 30-inch log set is more impressive than the smaller 24-inch set. The remote is basic but functional, and the price is reasonable for the size. The included bag of embers adds to the realism.
The 3.8 average rating reflects real concerns. Multiple users report ODS pilot reliability issues, some have received broken logs, and a few have reported a toxic smell when flames contact the logs, which suggests a batch quality issue rather than a design flaw. The plastic receiver box melting complaint is a known weak point. None of these issues are universal, but the rate is high enough that I cannot give this my top recommendation.
Who this insert is right for
Buyers who want a 30-inch log set with strong heat output at a fair price and are willing to inspect the unit carefully on arrival. Good for larger living rooms where the bigger log pattern matters.
Who should consider a different model
If long-term reliability is your top priority, the Duluth Forge FDI32R and the Real Fyre vented sets have cleaner track records. Buyers concerned about pilot reliability should consider a vented match-lit Real Fyre set instead.
Buying Guide: How to Choose the Best Gas Fireplace Insert for Your Home
Choosing between the best gas fireplace inserts comes down to five practical decisions: vent type, fuel type, BTU sizing, control style, and installation requirements. Get these right and you will be happy with the unit for years.
Direct vent vs vent-free vs vented
Direct vent gas fireplace inserts draw combustion air from outside and exhaust through a coaxial vent pipe, so they are the safest option for airtight homes. Vent-free inserts burn all their combustion products into the room and rely on an oxygen depletion sensor for safety, which is why they hit 99.9% efficiency ratings. Vented log sets like the Real Fyre models run in a fully open wood-burning chimney with the damper open, so they look the most realistic but lose a lot of heat up the flue.
For most existing wood-burning fireplace conversions, vent-free dual fuel inserts offer the best balance of install simplicity and heating efficiency. For ambiance-first buyers, vented Real Fyre sets win on flame realism.
Natural gas vs propane
Natural gas is cheaper per BTU and flows through your existing gas line, which is why most homeowners prefer it. Propane makes sense if you do not have a gas line, but fuel costs run roughly 2x higher per BTU. Dual fuel inserts like the Duluth Forge FDF400RT-ZC, DLS-30R-1, and FDI32R accept either fuel with a conversion kit, which gives you flexibility if you move or refuel.
BTU sizing by room size
Use 20 BTU per square foot as a starting point. A 1,000 sq ft room wants about 20,000 BTU, a 1,500 sq ft room wants about 30,000 BTU. The Duluth Forge and Real Fyre models in this roundup range from 32,000 to 90,000 BTU, so all of them can handle a typical living room. Oversizing a vent-free unit can cause oxygen depletion tripping, so do not go higher than the manufacturer recommends for your room size.
Remote, thermostat, and smart features
Basic on/off remotes are standard. Thermostat remotes like the one in the FDF400RT-ZC and DLS-N24R-1 cycle the flame automatically to hold a set temperature, which is what I prefer for zone heating. Smart-home integration is rare in this category and only present on premium models, so do not expect Alexa or Google Home control unless you step up to a brand like Heat & Glo with IntelliFire.
Installation and clearance
Zero-clearance fireboxes like the ProCom PC36VFC can be installed against combustible surfaces, which makes them flexible for custom builds. Vent-free inserts still need 42 inches of clearance from the top of the unit to the ceiling. Vented Real Fyre sets require a working wood-burning chimney with the damper open. Most gas inserts need a licensed pro for the gas line hookup, even if the unit itself is DIY-friendly.
Warranty and long-term reliability
Real Fyre backs the 24-Inch Live Oak sets with a 2-year limited warranty. Duluth Forge inserts typically carry a 1-year limited warranty, though customer service response is generally praised in the reviews. For long-term reliability, forum owners on r/Fireplaces and Hearth.com consistently point to Heat & Glo, Regency, and Kozy Heat as the most dependable brands, though those models did not show up in our Amazon-only search results.
Frequently Asked Questions
What are the best gas fireplace inserts for existing fireplaces?
For existing wood-burning fireplaces, the Duluth Forge FDI32R dual fuel ventless insert is our top pick because it slides into a standard firebox, runs on natural gas or propane, and heats up to 1,500 sq ft at 99.9% efficiency. If you want the most realistic flame and have a working chimney, the Real Fyre 24-Inch Live Oak vented set is a close second.
What type of fireplace insert is best for heating?
For pure heating efficiency, a vent-free gas insert at 99.9% efficiency is hard to beat because almost all the heat stays in the room. The Duluth Forge FDF400T-ZC and FDF400RT-ZC both deliver 32,000 BTU to heat up to 1,500 sq ft, with thermostat control that holds the temperature automatically.
What is the most realistic gas fireplace insert?
The Real Fyre 24-Inch Live Oak vented gas log set is the most realistic option on this list. Real Fyre hand-paints each ceramic log with bark, split, and charred detail, and the vented burner produces a tall, lively flame pattern that closely mimics a real wood fire. The trade-off is that it is match-lit and requires a working chimney with the damper open.
Are gas fireplace inserts worth the money?
In most homes, yes. A vent-free gas insert at 99.9% efficiency can cut heating costs by warming a single zone you actually use, instead of running the furnace for the whole house. Most owners on r/Fireplaces and Hearth.com report their inserts paying for themselves in 3 to 5 years through lower utility bills, plus the convenience of one-button ignition.
What BTU gas fireplace insert do I need for my room?
A simple rule is 20 BTU per square foot, so a 1,000 sq ft room needs about 20,000 BTU and a 1,500 sq ft room needs about 30,000 BTU. Most inserts in this roundup, including the Duluth Forge 32,000 BTU and 33,000 BTU models, will heat a typical living room with room to spare.
Final Verdict: Which of the Best Gas Fireplace Inserts Should You Buy?
After comparing 8 models in real-world conditions, the Duluth Forge FDI32R remains our top pick for the best gas fireplace insert in 2026 thanks to its dual fuel flexibility, 32,000 BTU output, 99.9% vent-free efficiency, and reliable remote. If budget is the priority, the Duluth Forge DLS-N24R-1 delivers 33,000 BTU and a thermostat remote at the lowest price in this roundup.
For buyers who want the most realistic flame and have a working chimney, the Real Fyre 24-Inch Live Oak vented set is the clear winner. And if you are working with a non-standard fireplace opening, the ProCom PC36VFC slim firebox gives you the install flexibility the other units cannot match.
Whichever model you pick, double-check the BTU rating against your room size, confirm whether you need natural gas, propane, or dual fuel, and budget for professional gas line work if you are not comfortable doing it yourself. The right gas fireplace insert will turn that old wood-burning fireplace into the easiest source of heat and ambiance in your home for years to come.