Key takeaways
- Pro: Accepts both NG and LP, future-proofing your purchase.
- Pro: Remote control with thermostat function keeps the room at a set temperature automatically.
- Con: Highest price on this list at just over $1,000.
What's inside
Most people shopping for a gas fireplace insert are dealing with one of two problems: a wood-burning insert they are tired of cleaning out every weekend, or an open masonry fireplace that pulls warm air up the chimney all winter. Either way, the goal is to stop losing heat and start producing it efficiently without the mess. Ventless and vented gas inserts solve this differently, and picking the wrong type for your room can mean a stuffy, oxygen-depleted living space or a cold corner no thermostat can warm.
What separates a good insert from a mediocre one comes down to heat output matching your square footage, the reliability of the control system (remote versus thermostat), and how convincingly the flame looks. A unit that blasts BTUs but produces a lazy, yellow flame will feel like a space heater wearing a disguise. The units below range from full inserts you drop into an existing firebox to standalone log sets you can retrofit in minutes, so the “best” choice depends entirely on your setup and fuel availability.
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Quick Picks
| Product | Best For | Price |
|---|---|---|
| Duluth Forge FDI32R | Overall best insert | $1,049.99 |
| Duluth Forge FDF400RT-ZC | Best value dual fuel insert | $947.46 |
| Duluth Forge FNF300T | Tight-budget install | $650.99 |
| Duluth Forge DLS-L18R-2 | Small firebox log set | $286.30 |
| Duluth Forge DLS-N24R-1 | Best ventless log set | $369.99 |
| Duluth Forge FLF300T | Propane homes on a budget | $650.99 |
| Real Fyre 24-Inch Live Oak | Vented traditional look | $380 |
| Duluth Forge FDF400T-ZC | Thermostat convenience | $939.49 |
How We Picked
We evaluated heat output relative to price, the practicality of the control method, flame realism and log styling, and fuel flexibility. Dual-fuel units earn a bump for buyers who may switch fuels later. We also weighted user ratings and flagged products where the control system felt like a compromise. A 3-star unit can still be a smart buy if you are replacing an eyesore in a guest room, but we made sure to say so plainly.
The 8 Best Gas Fireplace Inserts in 2026
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert (FDI32R)
If you want the most capable insert on this list and do not mind paying the highest price, this 32,000 BTU unit earns its top spot. The dual-fuel design lets you switch between natural gas and liquid propane without replacing the entire insert, a genuine hedge if you ever move to a propane-only property. Remote control operation means you can adjust the flame height and thermostat from the couch, and the stacked log set produces a realistic dancing flame that reads well even from across a large room.
- Pro: Accepts both NG and LP, future-proofing your purchase.
- Pro: Remote control with thermostat function keeps the room at a set temperature automatically.
- Con: Highest price on this list at just over $1,000.
Skip it if your firebox is small and you do not need 32,000 BTU; you would be paying for heat you cannot use.
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert (FDF400RT-ZC)
Another 32,000 BTU dual-fuel insert, this model shares the FDI32R’s heat output and fuel flexibility while trimming the price by roughly $100. That makes it the smart pick for buyers who want maximum heat per dollar in the insert category. The remote control works identically, and reviewers note a slightly lower flame height than the top pick, though it still delivers convincing visual warmth. Build quality feels a touch less solid in the glass door latch, which is the main reason it lands second rather than first.
- Pro: Same 32,000 BTU dual-fuel capability as our top pick at a lower price.
- Pro: Remote control simplifies daily use.
- Con: Glass door hardware feels less durable than the premium model.
Skip it if the $100 difference buys you better long-term hardware in your eyes.
Duluth Forge Natural Gas Ventless Gas Fireplace Insert (FNF300T)
At $650.99 and 26,000 BTU, this is the most affordable full insert here, and for a homeowner with natural gas and a modest-sized room, the math works. The T-stat control maintains a target temperature without babysitting a remote, which is genuinely convenient for bedrooms or home offices. Where it falls short is flame aesthetics and overall refinement. The log set looks sparse compared to pricier units, and the 3-star rating reflects real complaints about uneven burner ignition and a noisy thermocouple. This is a functional heater that does not pretend to be a showpiece.
- Pro: Lowest-priced complete insert on the list.
- Pro: Thermostat control handles temperature automatically.
- Con: Noticeable build and flame-quality compromises at this price.
Skip it if you want the unit to look as good as it heats.
Duluth Forge Ventless Liquid Propane Gas Log Set (DLS-L18R-2)
Not everyone needs a full insert. If your existing firebox is in decent shape and you simply want to stop burning wood, this 18-inch stacked oak log set for propane at $286.30 is the most economical path to gas heat. The 30,000 BTU output is more than enough for a mid-sized room, and the remote control adds convenience you rarely find under $300. The logs look convincing, though the shorter length means it fills smaller fireboxes best.
- Pro: Under $300 and still includes a remote control.
- Pro: 30,000 BTU is generous for an 18-inch set.
- Con: Propane-only; no fuel switching.
Skip it if your firebox is wide enough that 18-inch logs look lost.
Duluth Forge Ventless Natural Gas Log Set (DLS-N24R-1)
The highest-rated product on this entire list at 4.6 out of 5, and it is a relatively simple 24-inch ventless log set. The 33,000 BTU burner pushes serious heat, the split oak styling looks natural at full flame, and the remote is intuitive. At $369.99 it undercuts most full inserts while giving you most of the same convenience if your existing fireplace is already framed and clean. This is the pick for anyone whose priority is value and performance over the enclosed-box aesthetic.
- Pro: Top-rated unit on the list with 4.6 out of 5 stars.
- Pro: 33,000 BTU output at well under $400 is exceptional heat-per-dollar.
- Con: Open-front look does not hide the firebox, so it needs a clean surround.
Skip it if your existing firebox is damaged, stained, or aesthetically rough.
Duluth Forge Liquid Propane Ventless Gas Fireplace Insert (FLF300T)
Essentially the propane counterpart to the FNF300T above, this 26,000 BTU insert with T-stat control costs the same at $650.99. For rural propane users, it is the budget insert that does the job. Heat output is adequate for rooms in the 400-800 square foot range, and the thermostat keeps things comfortable without manual adjustment. It carries no published user rating, which limits our confidence, but the internal components mirror the rated FNF300T, so expect similar compromises in flame realism and long-term reliability.
- Pro: Same low $650.99 price as the natural gas version.
- Pro: Built-in thermostat for set-and-forget operation.
- Con: No user rating available, making quality assurance harder.
Skip it if you have access to natural gas and want better-documented reliability.
Real Fyre 24-Inch Live Oak Vented Gas Log Set
This is the only vented option on our list, and that distinction matters enormously. If your local code prohibits ventless units, or if you simply want the traditional wood-burning aesthetic with a roaring open flame and zero indoor emissions concern, this is your best path. The 90,000 BTU output dwarfs every other product here, which means it throws tremendous radiant heat but also wastes a lot up the chimney. The match-lit ignition is a deliberate step back from remote controls, but it produces a satisfying whoosh of flame. At $380 for natural gas, it is fair value.
- Pro: 90,000 BTU delivers an unmistakable open-flame visual and heat experience.
- Pro: Live oak logs look authentic even at a distance.
- Con: Vented design means significant heat escapes up the chimney.
Skip it if energy efficiency and low fuel bills are your top priorities.
Duluth Forge Dual Fuel Ventless Gas Fireplace Insert (FDF400T-ZC)
Twin to the FDF400RT-ZC above but swapped for T-stat control instead of a standalone remote. At $939.49 with 32,000 BTU and dual-fuel flexibility, it is a strong mid-range pick for anyone who prefers a hands-off thermostat. The 4.1 rating is solid, and the flame presentation matches its remote-control sibling. The only practical difference is that you cannot adjust flame height from across the room without walking to the unit, which is a minor annoyance rather than a dealbreaker.
- Pro: Dual-fuel capability at under $940 with a built-in thermostat.
- Pro: 32,000 BTU handles large living areas comfortably.
- Con: No remote means manual adjustment for flame changes.
Skip it if you value the ability to adjust flame height without leaving your seat.
Buying Guide
Vented versus Ventless
Ventless units return all produced heat into the room, making them dramatically more efficient, but they add moisture and combustion byproducts to your indoor air. Local building codes and some HOA rules restrict ventless installations, especially in bedrooms and small enclosed spaces. Vented units, like the Real Fyre option above, send exhaust up the chimney, which eliminates air-quality concerns but wastes a meaningful share of the heat. If you have an existing chimney and prioritize the traditional flame, go vented. If your goal is maximum warmth per BTU, go ventless.
Control Type: Remote versus Thermostat
A remote gives you on-the-fly flame adjustment from the couch, which most people prefer for living rooms. A built-in thermostat, labeled T-stat on these products, lets you set a target temperature and forget it, ideal for bedrooms, basements, or anyone who finds themselves adjusting the flame multiple times a day. Some units offer both. If a model only has one, pick based on whether you will want to change flame height frequently or maintain a constant temperature.
BTU Output and Room Size
As a general rule, roughly 20 to 25 BTU per square foot covers a moderately insulated room. A 32,000 BTU insert handles spaces up to about 1,500 square feet, while the 26,000 BTU FNF300T is better suited to rooms in the 1,000-1,200 square foot range. Oversizing a unit does not waste much money if it runs on a thermostat, but it does mean the flame may look lazy on low settings. Undersizing means the burner runs at full capacity constantly, shortening its lifespan.
Our Verdict
For the majority of buyers replacing an old wood insert or upgrading a functional firebox, the Duluth Forge FDI32R is the best gas fireplace insert in 2026. It balances the highest heat output in the ventless insert category, dual-fuel flexibility, and a remote control in a single package. If you are on a strict budget, the Duluth Forge DLS-N24R-1 log set at $369.99 delivers the top user rating on this list and more BTU than any other product under $400. And if your code prohibits ventless units or you want the open-flame drama of a real fire, the Real Fyre 90,000 BTU vented set wins by default with no meaningful competition in this roundup.
FAQ
Do ventless gas fireplace inserts need a chimney?
No. Ventless inserts operate as a sealed combustion system that releases heat and byproducts directly into the room. They require adequate air circulation and may need an oxygen depletion sensor, but no chimney or flue is necessary.
Can I switch between natural gas and propane on a dual-fuel insert?
Yes, the dual-fuel models from Duluth Forge on this list allow fuel switching, typically through a conversion kit or simple valve adjustment. Confirm with the manufacturer which method your specific model uses before relying on this flexibility.
Are gas log sets easier to install than full inserts?
Generally yes. A gas log set drops into an existing firebox and connects to a gas line, often completed in under an hour by a DIYer with basic plumbing skills. A full insert must fit precise dimensions and may require a gas line upgrade and electrical work for the blower.
How much heat will I actually get from a 32,000 BTU insert?
In a well-insulated space, a 32,000 BTU ventless insert can comfortably heat an area up to roughly 1,500 square feet. Actual performance depends on insulation quality, ceiling height, climate, and how open your floor plan is relative to the installation room.
