4 Best Propane Fireplace Inserts in 2027

I picked four vent-free Duluth Forge inserts for buyers who want propane heat without adding a chimney or exterior vent. My best overall choice is the 32,000-BTU dual-fuel remote model, because it offers the most heat in this group and can run on propane or natural gas. For a more straightforward propane-only setup, the 26,000-BTU thermostat model has room-temperature control and a smaller, lighter body. If you prefer a remote, its companion model adds one; if you may switch fuel sources, the thermostat-controlled dual-fuel insert offers the same higher output without remote operation.

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The main tradeoff is between fuel flexibility, heating capacity, and control style. The 32,000-BTU inserts cover up to 1,500 square feet on paper, compared with 1,350 square feet for the 26,000-BTU pair, but they are heavier and require at least 42 inches of clearance above the fireplace. The 26,000-BTU options are propane-only, yet their thermostat or remote controls may suit a simpler room-heating plan. I also flag a shared consideration: each model is vent-free, and each has a blower sold separately or not listed as included, so buyers should check local rules and installation requirements before choosing.

Key Takeaways

• The FDF400RT-ZC is my best overall pick for buyers who want 32,000 BTU, remote control, and the option to use either propane or natural gas.
• The FLF300T is the simpler propane-only choice, with thermostat control and a lighter 47.6-pound body than the 32,000-BTU models.
• The FLF300R adds remote on/off and temperature control to the same 26,000-BTU propane platform, but it needs four AA batteries.
• The FDF400T-ZC combines 32,000 BTU and dual-fuel operation with thermostat control instead of a remote.
• All four are vent-free and include an oxygen depletion sensor with automatic shut-off; local rules, room suitability, and clearances still need checking.

Our Top Best Propane Fireplace Inserts Picks

Duluth Forge Dual Fuel Vent-Free Gas Fireplace Insert, 32,000 BTU, Remote Control, Model FDF400RT-ZC		Best Overall — the strongest mix of heat, fuel flexibility, and remote operation	Fuel: Natural gas or liquid propane	Maximum heat output: 32,000 BTU	Listed heating coverage: Up to 1,500 sq. ft.	VIEW LATEST PRICE	See Our Full Breakdown
Duluth Forge Dual Fuel Vent-Free Fireplace Insert, 32,000 BTU, Thermostat Control, Model FDF400T-ZC		Best for Automatic Temperature Control — dual-fuel heat without a remote-first setup	Fuel: Natural gas or liquid propane	Maximum heat output: 32,000 BTU	Listed heating coverage: Up to 1,500 sq. ft.	VIEW LATEST PRICE	See Our Full Breakdown
Duluth Forge Ventless Liquid Propane Fireplace Insert, 26,000 BTU, Thermostat Control (FLF300T)		Best Propane-Only Fit — thermostat control in the lighter, lower-output model	Fuel: Liquid propane	Maximum heat output: 26,000 BTU	Listed heating coverage: Up to 1,350 sq. ft.	VIEW LATEST PRICE	See Our Full Breakdown
Duluth Forge Ventless Liquid Propane Fireplace Insert, 26,000 BTU, Remote Control, Model FLF300R		Best Remote-Controlled Compact Pick — handheld operation on the 26,000-BTU propane platform	Fuel: Liquid propane	Maximum heat output: 26,000 BTU	Listed heating coverage: Up to 1,350 sq. ft.	VIEW LATEST PRICE	See Our Full Breakdown

More Details on Our Top Picks

1. Duluth Forge Dual Fuel Vent-Free Gas Fireplace Insert, 32,000 BTU, Remote Control, Model FDF400RT-ZC

   

   Best Overall — the strongest mix of heat, fuel flexibility, and remote operation

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   I rank the FDF400RT-ZC first because it delivers the broadest set of practical choices in this lineup. Its 32,000-BTU maximum output is the highest listed here, and its dual-fuel design accepts either liquid propane or natural gas. That gives buyers more flexibility than the propane-only FLF300T and FLF300R, especially if a home’s available gas supply changes or the insert needs to suit a property with an existing natural-gas connection. Its stated coverage reaches 1,500 square feet, 150 square feet more than the 26,000-BTU models.

   The included remote control puts operation within reach from across the room, while six hand-painted ceramic fiber logs and an iron grate give it a fuller firebox presentation than the five-log 26,000-BTU pair. It also includes an oxygen depletion sensor with automatic shut-off. Those conveniences help explain why I place it ahead of the thermostat-controlled FDF400T-ZC: this model brings the same listed heat capacity and dual-fuel capability, but adds remote operation for buyers who prefer not to adjust the unit at the firebox.

   That advantage comes with real fit requirements. At 69.5 pounds, it is substantially heavier than either 26,000-BTU insert, and its 15.6-inch depth calls for careful measurement. The product information also specifies at least 42 inches of clearance from the fireplace top to the ceiling. The blower is sold separately, so the included remote does not mean every comfort accessory comes in the box. As a vent-free appliance, it also needs a careful local-code and room-suitability check before purchase; the absence of a chimney requirement is not permission to install it anywhere.

   I would choose this over the FDF400T-ZC if handheld control is a priority, or over the FLF300R if the extra output and fuel choice justify a larger unit. Buyers who know they only need propane heat in a smaller area may find the lighter FLF300T more fitting, with no need to pay in space or weight for capacity they do not expect to use.

   Pros:

   • Dual-fuel operation supports liquid propane or natural gas.
   • 32,000-BTU output and stated coverage up to 1,500 square feet exceed the 26,000-BTU models.
   • Remote control is included, along with six ceramic fiber logs and an iron grate.
   • Oxygen depletion sensor and automatic shut-off are included.

   Cons:

   • At 69.5 pounds, it is heavier than the two 26,000-BTU options.
   • Requires at least 42 inches of clearance above the fireplace.
   • Blower is sold separately, and vent-free installation may not suit every location.

   Best for: Buyers who want the highest listed output in this group, need propane-or-natural-gas flexibility, and prefer remote operation.

   Not ideal for: Shoppers with limited overhead clearance, a small installation area, or no need for dual-fuel operation or 32,000 BTU.

   • Fuel:Natural gas or liquid propane
   • Maximum heat output:32,000 BTU
   • Listed heating coverage:Up to 1,500 sq. ft.
   • Ventilation:Vent-free; no outside duct or chimney required
   • Controls:Remote control included
   • Logs and grate:Six ceramic fiber logs and iron grate
   • Safety:Oxygen depletion sensor with automatic shut-off
   • Dimensions and weight:29.1 in. W × 29.5 in. H × 15.6 in. D; 69.5 lbs
   • Clearance and blower:At least 42 in. above fireplace; blower sold separately
   Our verdict

   “I recommend the FDF400RT-ZC as the most flexible all-round pick when its higher output, clearance needs, and vent-free installation conditions fit the room.”

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2. Duluth Forge Dual Fuel Vent-Free Fireplace Insert, 32,000 BTU, Thermostat Control, Model FDF400T-ZC

   

   Best for Automatic Temperature Control — dual-fuel heat without a remote-first setup

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   The FDF400T-ZC earns its place as the best thermostat-controlled option for buyers who want the higher-capacity platform but do not need a remote. Like the FDF400RT-ZC, it runs on either liquid propane or natural gas, reaches a listed 32,000 BTU, and is rated for spaces up to 1,500 square feet. Its thermostat automatically cycles the insert to maintain the selected temperature, a useful distinction from choosing a model based mainly on remote convenience.

   Compared with the remote-controlled FDF400RT-ZC, this model swaps handheld operation for thermostat cycling. That can be a better fit if the goal is to set a room temperature and let the unit regulate its operation, rather than use a remote to manage the appliance. It also has six hand-painted ceramic fiber logs and an oxygen depletion sensor with automatic shut-off. In heat output, fuel choice, and stated coverage, it matches the remote version rather than exceeding it.

   The tradeoffs are much like those of its remote sibling: this is a 69.5-pound, vent-free insert with a listed 42-inch minimum clearance above the fireplace. The supplied details do not list a remote as included, so buyers seeking remote on/off and temperature adjustments should choose the FDF400RT-ZC instead. The listing also does not state blower inclusion, so I would confirm the accessory package rather than assume forced-air circulation is part of the purchase. Neither the larger output nor thermostat feature removes the need to check local restrictions and the manufacturer’s installation requirements.

   I place it below the FDF400RT-ZC because the remote model offers the same dual-fuel capability and output while adding a control method some buyers value. But if automatic room-temperature cycling is the feature you actually want, the FDF400T-ZC is the more direct match. Compared with the FLF300T, it offers more listed heat and the option of natural gas, but it is larger, heavier, and subject to the same substantial overhead-clearance requirement as the other 32,000-BTU insert.

   Pros:

   • Runs on either liquid propane or natural gas.
   • Thermostat automatically cycles the insert to maintain the desired temperature.
   • 32,000-BTU output is rated for spaces up to 1,500 square feet.
   • Includes six hand-painted ceramic fiber logs and an oxygen depletion sensor with automatic shut-off.

   Cons:

   • Weighs 69.5 pounds, more than either 26,000-BTU option.
   • Requires at least 42 inches of clearance above the fireplace.
   • Remote and blower inclusion are not specified in the supplied details.

   Best for: Buyers who want 32,000-BTU dual-fuel operation and prefer thermostat-controlled cycling over remote operation.

   Not ideal for: People who need a lighter insert, have less than 42 inches of overhead clearance, or want an included remote.

   • Fuel:Natural gas or liquid propane
   • Maximum heat output:32,000 BTU
   • Listed heating coverage:Up to 1,500 sq. ft.
   • Efficiency:99.9%
   • Ventilation:Vent-free
   • Control:Thermostat control with automatic cycling
   • Logs:Six hand-painted ceramic fiber logs
   • Dimensions and weight:29.1 in. W × 29.5 in. H × 15.6 in. D; 69.5 lbs
   • Safety and clearance:Oxygen depletion sensor with automatic shut-off; at least 42 in. above fireplace
   Our verdict

   “Choose the FDF400T-ZC over its remote sibling when thermostat cycling matters more than handheld control and the larger installation footprint fits.”

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3. Duluth Forge Ventless Liquid Propane Fireplace Insert, 26,000 BTU, Thermostat Control (FLF300T)

   

   Best Propane-Only Fit — thermostat control in the lighter, lower-output model

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   I rank the FLF300T as the best straightforward propane-only choice because it pairs a 26,000-BTU output with thermostat control in a body that weighs 47.6 pounds. Its stated heating coverage is up to 1,350 square feet, which is less than the 1,500-square-foot rating of the 32,000-BTU dual-fuel models. That lower capacity may be a sensible match for buyers who do not need the larger units’ extra output or natural-gas option.

   The thermostat is its main advantage over the FLF300R. Both 26,000-BTU inserts use liquid propane, share the same stated coverage, and include five hand-painted ceramic fiber logs and an oxygen depletion sensor with automatic shut-off. The FLF300T’s thermostat control automatically cycles to maintain room temperature, while the FLF300R adds remote on/off and temperature control. I would choose this one when maintaining a set temperature matters more than adjusting the insert from across the room.

   Its zero-clearance design supports recessing it into a wall or pairing it with a mantel, and the product information says no chimney or outside duct is required. The battery-assisted piezo ignition is included, but the blower is sold separately. The lighter weight is an advantage over the 69.5-pound dual-fuel models, though it does not remove the need to confirm dimensions, installation clearances, fuel supply, and local approval. Vent-free appliances are not suitable for every home or jurisdiction, so I would check these points before selecting it.

   There are clear reasons to step up to another model. The FLF300R is more convenient if remote temperature adjustment is the deciding feature, while the FDF400T-ZC supplies more listed heat and can use natural gas as well as propane. The FLF300T makes more sense when propane-only operation and thermostat control are enough, and the buyer prefers a lighter insert over the greater capacity and flexibility of the 32,000-BTU models.

   Pros:

   • Thermostat automatically cycles to maintain room temperature.
   • 26,000-BTU output is rated for spaces up to 1,350 square feet.
   • Zero-clearance design supports recessed or mantel installation.
   • Includes an oxygen depletion sensor with automatic shut-off.

   Cons:

   • Operates on liquid propane only.
   • Blower is sold separately.
   • No remote control is listed as included.

   Best for: Propane users who want a thermostat-controlled insert rated for up to 1,350 square feet and value lower weight than the 32,000-BTU models.

   Not ideal for: Buyers who want a remote, need the highest listed heat output, or may want to switch between propane and natural gas.

   • Fuel:Liquid propane
   • Maximum heat output:26,000 BTU
   • Listed heating coverage:Up to 1,350 sq. ft.
   • Efficiency:99.9%
   • Ventilation:Vent-free; no chimney or outside duct required
   • Control:Thermostat control
   • Logs and ignition:Five ceramic fiber logs; battery-assisted piezo ignition
   • Safety:Oxygen depletion sensor with automatic shut-off
   • Dimensions and weight:29.1 in. W × 23.9 in. H × 13.9 in. D; 47.6 lbs
   Our verdict

   “The FLF300T is my pick for propane-only buyers who want thermostat control and a lighter alternative to the larger dual-fuel inserts.”

   → See it on Amazon →

4. Duluth Forge Ventless Liquid Propane Fireplace Insert, 26,000 BTU, Remote Control, Model FLF300R

   

   Best Remote-Controlled Compact Pick — handheld operation on the 26,000-BTU propane platform

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   The FLF300R is the right pick for buyers who want a remote without moving up to the heavier, higher-output dual-fuel models. It shares the FLF300T’s 26,000-BTU rating, 1,350-square-foot stated coverage, propane-only fuel, zero-clearance design, and 47.6-pound weight. Its defining difference is the included remote, which offers on/off and temperature control so basic adjustments can be made from the room.

   Compared with the FLF300T, this model gives up the explicitly described thermostat control in favor of a remote with temperature adjustment. The product information lists remote temperature control but does not describe the same automatic cycling feature in the FLF300T’s terms, so buyers who specifically want the insert to cycle itself to maintain a room temperature may prefer the thermostat model. The FDF400RT-ZC is a stronger choice if you want a remote plus more output and natural-gas compatibility, but it weighs 21.9 pounds more and has the 42-inch overhead-clearance requirement.

   The FLF300R includes five hand-painted ceramic fiber logs and an oxygen depletion sensor with automatic shut-off. It needs four AA batteries, an ongoing small but easy-to-miss requirement, and the blower is sold separately. The unit’s vent-free format means buyers must confirm local rules and whether this type of appliance is permitted and appropriate for their room. “No chimney required” is a feature of the design, not a reason to skip professional guidance or the specified installation instructions.

   I place it fourth because the remote is a helpful convenience, but it does not add output or fuel flexibility over the less expensive-to-operate-in-specification comparison partner FLF300T; I cannot judge actual running costs from these details. Choose it when remote access is worth the battery requirement and you are comfortable with propane-only operation. If temperature cycling is your priority, the FLF300T is the better match; if broader fuel choice and capacity matter more, look to either 32,000-BTU model.

   Pros:

   • Remote provides on/off and temperature control.
   • Rated for up to 1,350 square feet with 26,000 BTU of maximum output.
   • Zero-clearance design allows recessed or mantel installation.
   • Includes five ceramic fiber logs and an oxygen depletion sensor with automatic shut-off.

   Cons:

   • Requires four AA batteries for the remote.
   • Blower is sold separately.
   • Uses liquid propane only and has less listed output than the dual-fuel models.

   Best for: Propane-only buyers who want remote on/off and temperature control in a lighter 26,000-BTU insert.

   Not ideal for: People who prefer thermostat-driven cycling, do not want to manage AA batteries, or need natural-gas compatibility or more listed capacity.

   • Fuel:Liquid propane
   • Maximum heat output:26,000 BTU
   • Listed heating coverage:Up to 1,350 sq. ft.
   • Efficiency:99.9%
   • Ventilation and installation:Vent-free; zero-clearance design for wall recessing or mantel use
   • Remote:Included; on/off and temperature control
   • Batteries:Four AA required
   • Logs and safety:Five ceramic fiber logs; oxygen depletion sensor with automatic shut-off
   • Dimensions and weight:29.1 in. W × 23.9 in. H × 13.9 in. D; 47.6 lbs
   Our verdict

   “Choose the FLF300R when remote convenience matters more than the FLF300T’s thermostat emphasis or the larger dual-fuel models’ extra capacity.”

   → See it on Amazon →

How We Picked

I compared these four inserts as propane fireplace options, not as general-purpose space heaters. The lineup has two distinct size and fuel groups: a 26,000-BTU propane-only pair rated for spaces up to 1,350 square feet, and a 32,000-BTU dual-fuel pair rated for up to 1,500 square feet. That difference matters more to a buyer’s decision than the small visual variations in their ceramic logs.

My ranking gives weight to useful heat capacity, fuel choice, control convenience, and installation fit. I give the remote-controlled dual-fuel model the lead because it combines the greatest listed output with the ability to use either liquid propane or natural gas, then distinguish its thermostat-controlled sibling for buyers who want automatic temperature cycling without a remote. The two 26,000-BTU models follow as more compact propane-only alternatives, with the thermostat version ahead for direct room-temperature control and the remote version suited to people who value handheld operation.

I also counted the limitations rather than treating feature lists as a scorecard. All four are vent-free, so their suitability depends on local regulations, room conditions, and the manufacturer’s installation instructions. The 32,000-BTU models weigh 69.5 pounds and list a 42-inch minimum top clearance; the 26,000-BTU models weigh 47.6 pounds. Blowers are sold separately where specified, and the propane-only models cannot switch to natural gas. These are product comparisons, not a substitute for professional installation advice or local code checks.

Factors to Consider When Choosing Best Propane Fireplace Inserts

I would narrow this group by answering four practical questions before comparing controls: Is vent-free allowed where the insert will go? Which fuel can you use? How much heat do you need? Will the body and required clearances fit? Once those are settled, choosing between remote operation and thermostat control becomes much easier.

Check vent-free rules and room suitability first

All four models are vent-free, meaning the listed design does not require a chimney or outside duct. That can open up installation options, but it does not make every room or location suitable. Local codes may restrict vent-free appliances, and a manufacturer’s instructions can specify conditions that are not obvious from the headline product details. I would check local requirements and consult a qualified installer before ordering.

Each product lists an oxygen depletion sensor with automatic shut-off. That safety feature is useful, but it should not be treated as a substitute for following installation and operating instructions, or as a guarantee that any space is appropriate. If vent-free appliances are restricted where you live, these four models may not fit your project, regardless of their heat output or controls.

Choose propane-only or dual-fuel operation

The FLF300T and FLF300R run on liquid propane only. That keeps the choice simple if propane is the fuel you plan to use, but those models do not offer a path to natural gas. The FDF400RT-ZC and FDF400T-ZC accept either natural gas or liquid propane. I would favor one of them if the home already has a natural-gas connection, or if having two fuel options matters for a longer-term installation.

Dual-fuel does not mean the insert changes fuel sources by itself. You still need a compatible supply and an installation set up for the fuel being used. Confirm the product instructions and installer’s guidance before selecting or converting a fuel configuration. If you only need propane, the simpler fuel specification of the 26,000-BTU models may be sufficient.

Match the output rating to the room, not just the biggest number

The two 26,000-BTU models are listed for spaces up to 1,350 square feet; the 32,000-BTU pair is listed for up to 1,500 square feet. Those are useful comparison points, not a promise that every home with that floor area will heat evenly. Room layout, ceiling height, insulation, climate, and how much of the home is open to the fireplace can all affect results.

I would not select the 32,000-BTU model automatically just because it has the largest rating. The FLF300T or FLF300R may fit a smaller heating task, and both are lighter than the larger inserts. Choose the FDF400RT-ZC or FDF400T-ZC when the additional listed output and dual-fuel capability match the room and supply—not simply as a general upgrade.

Compare remote convenience with thermostat control

The FLF300T and FDF400T-ZC are the thermostat-control choices. The supplied descriptions say their thermostats cycle the insert to maintain the chosen room temperature. That is the clearest match for buyers who want temperature regulation rather than repeatedly adjusting settings by hand.

The FLF300R and FDF400RT-ZC include remotes. The FLF300R remote provides on/off and temperature control, while the FDF400RT-ZC is listed with remote control. The FLF300R requires four AA batteries. If you care more about remote access than automatic thermostat cycling, select the corresponding remote model; if maintaining a selected temperature is the main priority, compare the thermostat versions.

Measure the opening, depth, weight, and overhead clearance

The propane-only models measure about 29.1 inches wide, 23.9 inches high, and 13.9 inches deep, and weigh 47.6 pounds. The 32,000-BTU models are about 29 inches wide and 29.5 inches high, with 15.6 inches of depth, and weigh 69.5 pounds. Check the actual installation manual and measure the fireplace opening, depth, surrounding structure, and route into the room before buying.

The dual-fuel models list a minimum 42-inch clearance above the fireplace. That overhead requirement can rule them out even when the firebox dimensions appear to fit. The FLF300T and FLF300R are lighter and have a shorter listed height, but buyers still need to verify their required clearances and installation method using the model-specific instructions.

Account for accessories and the fireplace’s role

The FLF300T and FLF300R list a blower sold separately; the FDF400RT-ZC does as well. The supplied details do not establish that a blower is included with the FDF400T-ZC, so I would verify the package contents before assuming it comes with one. A separate blower affects both the final setup and how heat moves around the room, so decide whether natural convection alone suits your use.

Also decide whether you want the insert mainly for supplemental room heat, the appearance of a gas fire, or both. All four include ceramic fiber logs; the 26,000-BTU models have five, while the 32,000-BTU models have six. These shared presentation details should come after fuel, fit, local approval, and control style in your decision—not replace them.

Frequently Asked Questions

Can I install any of these propane fireplace inserts without a chimney?

All four are described as vent-free, and their listings say they do not require a chimney or outside duct. That does not mean every installation is permitted or suitable. I would check local codes, the specific model’s installation manual, and a qualified installer’s advice before purchase. The listed safety sensor does not replace those checks.

Which models can use natural gas as well as propane?

The FDF400RT-ZC and FDF400T-ZC are dual-fuel models for natural gas or liquid propane. The FLF300T and FLF300R are listed for liquid propane only. Confirm the intended fuel supply and approved setup with the installer and model instructions; dual-fuel capability does not mean an appliance can be switched without the correct configuration.

Which insert should I choose if I want the unit to maintain a room temperature?

The FLF300T and FDF400T-ZC are the models explicitly described with thermostat control that automatically cycles to maintain a selected temperature. The FLF300R remote includes temperature control, but its description does not state the same thermostat-cycling behavior. The FDF400RT-ZC includes a remote, making it a better fit if handheld operation is your priority.

Do any of these inserts include a blower?

The supplied details say the blower is sold separately for the FLF300T, FLF300R, and FDF400RT-ZC. The FDF400T-ZC details do not specify blower inclusion, so I would check the exact package contents with the seller before ordering. Do not assume a blower is included based on the appearance or output rating of the insert.

What clearance should I plan for above the 32,000-BTU models?

The FDF400RT-ZC and FDF400T-ZC listings specify at least 42 inches of clearance from the fireplace top to the ceiling. Verify that measurement against the current installation manual and all other required clearances before deciding the unit fits. The 26,000-BTU models have different dimensions, but their required clearances should also be checked in their own manuals.

Conclusion

For most buyers who want a balance of high output, fuel flexibility, and remote operation, I would start with the FDF400RT-ZC—provided the 42-inch overhead clearance, heavier body, and vent-free installation requirements work for the room. Choose the FDF400T-ZC instead if you want the same 32,000-BTU dual-fuel platform with thermostat cycling rather than a remote-first setup.

If propane is your only planned fuel, the FLF300T is my pick for thermostat control in a lighter 26,000-BTU insert. Choose the FLF300R when remote temperature and on/off control matter more than the thermostat model’s explicit automatic-cycling description, and keep its four-AA-battery requirement in mind. Before committing to any of them, I would check local vent-free rules, confirm the fuel setup, measure the installation area and clearances, and establish whether a separate blower is needed.