Gas Inserts
Turn your drafty old fireplace into an efficient heating machine. Gas inserts slide right into your existing masonry opening—sealed combustion, instant flames, zero ash.
Vented Gas Inserts
Direct-vent gas inserts fit inside your existing fireplace opening, converting an inefficient wood-burning fireplace into a high-efficiency gas heating source.
Good Gas Inserts
Better Gas Inserts
Best Gas Inserts
Modern Gas Inserts (Glass Burner)
Vent-Free Gas Inserts
No chimney or venting required. Vent-free inserts deliver supplemental heat and ambiance in any room with an existing fireplace opening.
Traditional Vent-Free Inserts
Modern Vent-Free Inserts (Glass)
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Browse our full catalog of gas inserts, compare models, and get your estimate—all online.
Browse All Gas InsertsOverview
Why Homeowners Switch to Gas Inserts
If you've got an existing masonry fireplace that sends more heat up the chimney than into the room, a gas insert changes everything. These units slide into the firebox opening and connect to a sealed, direct-vent liner that runs up your existing flue. The result is a closed combustion system that draws outdoor air for burning and vents exhaust back outside—keeping your indoor air clean while delivering real, measurable warmth.
Most gas inserts operate between 20,000 and 40,000 BTU, with efficiency ratings in the 75–85% range. That's a massive upgrade from a traditional open fireplace, which can actually have a negative efficiency rating once you account for all the heated room air it pulls up the chimney. Homeowners across Central New Jersey typically notice a difference in their heating bills within the first season after installation.
At Alber's, we've been converting wood-burning fireplaces to gas inserts since the technology first hit the residential market. Our NFI-certified technicians measure your firebox, inspect your chimney, and recommend the right insert and liner combination for your specific opening. We handle gas line connections, electrical work, and all required permits—so you don't have to coordinate multiple contractors.
Stop by our 8,000 sq ft showroom in Green Brook to see working gas inserts side by side. You'll feel the heat output, compare flame patterns, and get a clear picture of what the finished project will look like in your home. Our factory-trained team has been helping New Jersey families make this upgrade since 1976, and we'll walk you through every option honestly—no pressure, just straight answers.
Benefits
Why Choose a Gas Insert?
Energy Efficiency
Sealed combustion captures heat that an open fireplace wastes. Most inserts hit 75–85% efficiency ratings.
Easy Conversion
Keep your existing masonry fireplace. The insert slides in, connects to a liner, and you're done—no major construction.
Zone Heating
Heat the room you're in instead of the entire house. Lower the thermostat, run the insert, and cut your energy costs.
Low Maintenance
No ash, no creosote buildup, no chimney sweeping. An annual service call is all most gas inserts need.
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Browse by Category
Gas Fireplaces
Instant heat, realistic flames
Gas Inserts
Upgrade your existing fireplace
Gas Stoves
Freestanding warmth, classic charm
Gas Logs
Flames in your masonry fireplace
Wood Fireplaces
The authentic wood-burning experience
Wood Inserts
Convert to high-efficiency wood
Wood Stoves
Freestanding heating independence
Outdoor Fireplaces
Extend your living space outside
Electric Fireplaces
Plug in and enjoy, no gas line
Electric Inserts
Easy conversion, zero clearance
Electric Stoves
Classic look, zero installation
All Products
Explore our full catalog
Ready to See Gas Inserts in Person?
Visit our 8,000 sq ft showroom to compare working gas inserts side by side. Our NFI-certified team will measure your existing fireplace and recommend the right fit—no guesswork, no surprises.