Choosing the right heating solution can transform both comfort and efficiency in your home. Ventless gas fireplace inserts with thermostat control are designed to deliver consistent warmth without the need for a chimney or complex installation.
These modern inserts provide clean, reliable heat while allowing you to maintain your preferred temperature automatically. Ideal for living rooms, bedrooms, or compact spaces, they combine powerful performance with stylish design.
In this guide to the Top 9 Best Ventless Gas Fireplace Inserts with Thermostat Control, you will discover options that balance safety, energy efficiency, and visual appeal, helping you find the perfect insert to enhance your home’s atmosphere and year-round comfort.
9. Americangaslogs 18Inch Natural Gas Fireplace Logs
Experience the warmth of a real fire without the hassle of venting or a chimney. The Americangaslogs 18‑24 inch ventless fireplace log set is engineered exclusively for natural‑gas installations, delivering up to 36,000 BTU with an impressive 99.9 % efficiency.
Designed for compact fireboxes as small as 14” H × 20” W × 13” D, this all‑in‑one kit includes ceramic logs, volcanic rock, glowing embers, a burner, and a remote‑control system for effortless operation.
A built‑in Oxygen Depletion Sensor (ODS) and battery‑assisted ignition automatically shut off the unit if unsafe conditions arise, giving you peace of mind.
The included remote lets you ignite, extinguish, or fine‑tune the flame height with a single press, while the manual adjustment knob offers personalized heat output.
With enough power to comfortably heat up to 1,000 sq ft, you’ll enjoy cozy evenings without sacrificing floor space or aesthetic appeal.
Pros
- Powerful 36,000 BTU heat output
- 99.9 % combustion efficiency saves energy
- Remote control for instant on/off and flame control
- Compact fit for small fireboxes and tight spaces
- Built‑in ODS safety shuts off automatically
Cons
- Only compatible with natural‑gas connections
- Requires professional installation for ventless setup
- Remote batteries need periodic replacement
8. Duluth Forge DLS-30R-1 Dual Fuel Logs
The Duluth Forge DLS‑30R‑1 Dual‑Fuel Ventless Fireplace Logs Set delivers authentic, wood‑burning ambiance without the hassle of a chimney.
Patented dual‑fuel technology lets you choose natural gas or liquid propane, while the 33,000 BTU vent‑free burner operates at 99.9 % efficiency, heating your room quickly and cleanly.
Nine hand‑painted split red‑oak logs are crafted from high‑grade refractory ceramics for a realistic look and long lifespan, and they arrive with an iron grate, U‑burner chassis, and a bag of embers that create lively, glowing flames.
The included remote control and receiver box let you start, stop, and switch between manual or thermostat operation from anywhere in the room, and the battery‑assisted piezo ignition features an oxygen‑depletion sensor (ODS) that shuts the system down if unsafe conditions arise.
A damper clamp adds an extra layer of safety. All necessary hardware, AA & AAA batteries, and a clear instruction set are packaged for easy installation in any firebox that meets the minimum size requirement.
Pros
- Dual‑fuel flexibility for gas or propane
- 99.9 % efficient vent‑free heating performance
- Realistic hand‑painted red oak logs with embers
- Remote control with manual and thermostat modes
- Built‑in ODS safety shuts down on low oxygen
Cons
- Requires compatible firebox size
- No vermiculite bag included
- Remote batteries must be replaced periodically
7. Duluth Forge DF300L Gas Fireplace
The Duluth Forge DF300L delivers powerful, flexible heating without the hassle of a chimney. Its patented vent‑less dual‑fuel technology lets you choose natural gas or liquid propane, producing 26,000 BTU at 99.9 % efficiency—enough to comfortably warm up to 1,400 sq ft.
A built‑in thermostat automatically cycles the unit on and off, keeping your room at the temperature you set while maximizing energy savings. The insert showcases hand‑painted ceramic‑fiber faux logs and a sleek mesh screen, giving a realistic fireplace look that lasts for years.
Measuring just 7.84″ H × 18.05″ W × 27.95″ D, it fits neatly into most wall spaces, but be sure the ceiling clearance is at least 36″.
Safety is front‑and‑center with battery‑assisted piezo ignition, an oxygen‑depletion sensor that shuts down the flame if carbon monoxide or low oxygen is detected, and a reliable push‑button start. The package includes ceramic logs, an iron grate, and a AAA battery for immediate installation.
Pros
- Dual‑fuel flexibility for gas or propane
- 99.9 % efficient, heats large spaces easily
- Thermostat maintains consistent room temperature
- Realistic hand‑painted logs enhance décor
- Built‑in safety sensors protect against CO
Cons
- Requires 36″ ceiling clearance
- No built‑in remote control option
- Battery needed for ignition backup
6. Duluth Forge Dual Fuel Fireplace Insert
The Duluth Forge Dual Fuel Ventless Gas Fireplace Insert delivers powerful, efficient heating without the hassle of a chimney. Patented dual‑fuel technology lets you choose natural gas or liquid propane, providing up to 32,000 BTU and comfortably warming spaces as large as 1,500 sq ft.
Its 99.9 % efficiency means more heat and lower utility costs. The sleek black design features six hand‑painted ceramic‑fiber logs, mesh double doors, and a sprayed‑brick liner for an authentic, upscale look.
Installation is straightforward: a zero‑clearance firebox fits directly against or recessed into any wall with a gas line, while the compact dimensions (15.6″ H × 29.1″ W × 29.5″ D) keep it suitable for most rooms.
Control the flame from anywhere with the included LCD remote, which works with a standing pilot and offers manual flame adjustment. Safety is built‑in with a push‑button piezo ignition and clear clearance guidelines (minimum 42″ from ceiling).
The package comes complete with six ceramic logs, an iron grate, a AAA battery, remote, and receiver, all weighing just 69.5 lb.
Pros
- Dual‑fuel flexibility for gas or propane
- 32,000 BTU ventless heat, 99.9 % efficient
- Remote control with LCD screen and manual adjustment
- Realistic hand‑painted logs and mesh double doors
- Zero‑clearance installation fits tight spaces
Cons
- Requires 42″ ceiling clearance
- Remote needs occasional battery replacement
- Not suitable for homes without gas line access
5. Duluth Forge 26K Ventless Gas Fireplace Insert
The Duluth Forge Ventless 26,000 BTU gas fireplace insert delivers powerful, room‑filling heat without the need for a chimney or exterior vent. Its dual‑fuel capability lets you run on either liquid propane or natural gas, while the piezo‑ignition and included AAA battery make lighting a breeze.
Hand‑painted concrete logs, modeled after real wood, provide a high‑end, realistic look, and the superior refractory ceramics ensure durability for years of use.
A built‑in Oxygen Depletion Sensor monitors air quality, automatically shutting off the unit if carbon monoxide or low oxygen levels are detected, delivering peace of mind.
The remote control lets you fine‑tune temperature from anywhere in the room, and the 99.9 % efficiency rating means you get maximum warmth with minimal waste—perfect for heating up to 1,350 sq ft efficiently.
Pros
- Heats up to 1,350 sq ft efficiently
- Dual‑fuel flexibility for propane or natural gas
- Realistic hand‑painted logs enhance décor
- Remote control provides convenient temperature adjustments
- O.D.S. safety sensor automatically shuts off
Cons
- Requires adequate room ventilation for ventless operation
- Remote control batteries need periodic replacement
- Installation may need professional assistance for gas hookup
4. Duluth Forge DLS-24R-1 Ventless Fireplace Logs
The Duluth Forge DLS‑24R‑1 Dual‑Fuel Ventless Fireplace Logs Set delivers a full‑size, realistic fire experience without the hassle of a chimney.
Patented dual‑fuel technology lets you switch effortlessly between natural gas and liquid propane, while the 33,000 BTU burner operates at 99.9 % efficiency, heating your room quickly and cleanly.
Eight hand‑painted Berkshire Split Oak ceramic logs, an iron grate, and a bag of embers create authentic flames and a warm glow that lasts for years.
A remote control and receiver box let you turn the fire on or off, choose manual or thermostat mode, and set your preferred temperature from anywhere in the room.
Safety is built in with battery‑assisted piezo ignition, an oxygen depletion sensor that shuts down the unit if CO or low oxygen is detected, and an included damper clamp for added peace of mind.
The set fits a 24‑inch firebox and comes with all necessary hardware, AA/AAA batteries, and a sturdy u‑burner chassis for easy installation.
Pros
- Dual‑fuel flexibility for gas or propane
- 99.9 % efficient vent‑free heating
- Realistic hand‑painted oak logs and embers
- Remote control with manual/thermostat modes
- Built‑in oxygen depletion safety sensor
Cons
- Requires compatible 24‑inch firebox
- No vermiculite included for insulation
- Batteries needed for remote operation
3. Duluth Forge Dual Fuel Fireplace Insert
The Duluth Forge Dual Fuel Ventless Gas Fireplace Insert delivers powerful, efficient heating without the hassle of a chimney. Thanks to patented dual‑fuel technology, you can switch between natural gas and liquid propane, giving you flexibility for any home setup.
At 32,000 BTU, this 99.9 % efficient unit can comfortably warm up to 1,500 sq ft., making it ideal for living rooms, basements, or open‑plan spaces. The sleek black finish is complemented by nine hand‑painted ceramic‑fiber logs and a mesh screen, creating a realistic flame that adds warmth and ambiance.
Control is effortless with the included LCD remote; a standing pilot lets you start or stop the burner, and a manual flame‑adjust knob lets you set the perfect glow.
Installation is straightforward—no exterior venting required—thanks to the zero‑clearance firebox, which can be placed against or recessed into any wall with a gas line.
The package comes with an iron grate, 9 ceramic logs, a AAA battery, remote, and receiver, all within a compact 18.38″ H × 33.27″ W × 36.38″ D frame that weighs 88.2 lb.
Pros
- Dual‑fuel flexibility for gas or propane use
- Vent‑free design eliminates chimney installation
- Remote control with LCD screen for easy operation
- Realistic hand‑painted logs enhance visual appeal
- High efficiency heats large spaces quickly
Cons
- Requires 42″ clearance to ceiling
- Remote battery must be replaced periodically
- Not suitable for homes without gas line access
2. Duluth Forge DLS-18R Dual Fuel Fireplace Logs
The Duluth Forge DLS‑18R‑2 Dual‑Fuel Ventless Fireplace Logs set brings the look and feel of a real wood‑burning hearth to any indoor space without the hassle of a chimney.
Hand‑painted, concrete‑cast logs mimic stacked red oak, while a powder‑coated U‑Burner chassis delivers two rows of vivid flames for a truly authentic glow.
Thanks to the built‑in Oxygen Depletion Sensor, the unit automatically shuts off if carbon monoxide or low‑oxygen conditions are detected, keeping your family safe.
The economical 99.9 % efficiency rating means you get maximum heat from every BTU, and the 30,000 BTU output can comfortably warm up to 1,100 sq ft—comparable to central heating.
Choose natural gas or liquid propane, ignite with the convenient piezo button, and fine‑tune temperature from anywhere in the room using the included remote control.
Installation requires a masonry or agency‑approved firebox, and a small amount of assembly is needed, but once set up the ventless design eliminates the need for external ductwork.
Pros
- Real‑wood appearance with hand‑painted detail
- Dual‑fuel flexibility for gas or propane
- Remote control for effortless temperature adjustments
- Built‑in O.D.S. safety shut‑off system
- 99.9 % efficiency with no chimney required
Cons
- Requires approved masonry firebox installation
- Small assembly required before use
- Not suitable for outdoor or unvented spaces
1. Duluth Forge Dual Fuel Fireplace Insert
The Duluth Forge Dual‑Fuel Ventless Gas Fireplace Insert delivers powerful, efficient heat without the hassle of a chimney.
Its patented dual‑fuel system lets you switch seamlessly between natural gas and liquid propane, providing up to 26,000 BTU—enough to comfortably warm spaces as large as 1,350 sq ft. The unit operates at 99.9 % efficiency, so every BTU counts toward keeping your room cozy.
A built‑in thermostat automatically cycles the fire on and off, maintaining your chosen temperature with minimal effort.
The realistic, hand‑painted ceramic fiber logs and mesh screen create an authentic fireplace look, while the zero‑clearance firebox can be installed directly against a wall, saving precious space.
At 13.9″ H × 23.9″ W × 29.1″ D and weighing 47.6 lb, it fits most standard openings. Installation is straightforward with a push‑button piezo ignition, iron grate, and a single AAA battery included.
Pros
- Dual‑fuel flexibility for gas or propane
- 99.9 % efficiency, no vent required
- Thermostat maintains consistent room temperature
- Realistic ceramic logs add visual appeal
- Zero‑clearance design saves installation space
Cons
- Requires 48″ clearance to ceiling
- Not suitable for rooms lacking gas line
- Battery‑powered thermostat may need occasional replacement
Frequently Asked Questions
What is a ventless gas fireplace insert with thermostat control, and how does it work?
A ventless gas fireplace insert is a self‑contained heating unit that fits into an existing fireplace opening and burns clean‑burning propane or natural‑gas fuel without the need for a chimney or vent.
The built‑in thermostat continuously monitors the room temperature and automatically adjusts the flame output, maintaining your desired comfort level while conserving fuel.
Are ventless inserts safe, and what certifications should I look for?
Yes, modern ventless inserts are safe when installed and used correctly. Look for the following certifications and features:
- CSA/UL Listing – ensures the unit meets North American safety standards.
- EPA “Clean‑Burn” Certification – guarantees low emissions (≤ 4 g/hr CO).
- Oxygen Depletion Sensor (ODS) – automatically shuts off the burner if indoor oxygen drops below safe levels.
- Tip‑over and Overheat Protection – additional safeguards against accidental ignition.
Always have a licensed professional handle gas line connections and follow the manufacturer’s clearance requirements.
Conclusion
Choosing a ventless gas fireplace insert with thermostat control transforms a room into a cozy, energy‑efficient haven without the hassle of ductwork or extensive installation.
The right unit delivers consistent, adjustable heat, blends seamlessly with any décor, and operates safely thanks to built‑in oxygen depletion sensors and flame‑failure safeguards.
By prioritizing features such as BTU output, programmable settings, and low‑maintenance designs, homeowners can enjoy year‑round comfort while reducing reliance on central heating.
Ultimately, the best inserts balance performance, style, and safety, ensuring that the warmth they provide is both reliable and effortlessly tailored to your lifestyle.
