Converting Wood Burning Fireplace to Gas Insert

Why Convert Your Wood Burning Fireplace to a Gas Insert?

If you own a traditional wood burning fireplace, you already know the charm and ambiance it brings to your home. However, you may also be familiar with the drawbacks: the constant need for firewood, the ash cleanup, the smoke, and the relatively low heating efficiency. Converting your wood burning fireplace to a gas insert is one of the most popular upgrades for homeowners who want to retain the beauty of a real flame without the hassle of wood.

A gas insert is a self-contained unit that fits into your existing firebox. It typically includes a burner, logs (often realistic ceramic logs), a heat exchanger, and a blower. Because it is sealed and vented through a dedicated liner, a gas insert operates at a much higher efficiency than an open wood fireplace. According to industry data, a traditional wood fireplace may lose up to 90% of its heat up the chimney, while a modern gas insert can deliver 70-90% efficiency.

This guide will walk you through every step of the conversion process. Whether you are motivated by convenience, energy savings, or design flexibility, this article will help you understand the requirements, the costs, and the decisions involved. For a broader overview of fireplace types and how they compare, see our types of fireplaces explained and our electric vs gas vs wood comparison.

Is It Possible to Convert Your Wood Burning Fireplace to a Gas Insert?

In most cases, yes. The existing masonry firebox and chimney of a traditional wood burning fireplace provide a solid foundation for a gas insert. However, not all fireplaces are suitable. Here are the key factors that determine feasibility:

• Firebox Condition: The firebox must be structurally sound. Cracked or deteriorating masonry may require repair before an insert can be installed.
• Chimney Integrity: A chimney in good condition can usually accommodate a stainless steel liner, which is required for venting the gas insert.
• Type of Fireplace: Masonry fireplaces are generally straightforward. Prefabricated or zero-clearance fireplaces require a gas insert specifically designed for that application. You can learn more about zero clearance wood burning fireplaces and how they differ.
• Gas Availability: A natural gas line or propane supply must be available. If not, you will need to run a gas line, which adds to the cost. For scenarios without an existing gas line, see our guide on gas fireplace without a gas line.
• Local Codes and Permits: Most jurisdictions require a permit for gas insert installation. Check with your local building department. Our article on fireplace permit requirements provides a helpful overview.

A professional chimney sweep or fireplace installer can perform an inspection and confirm whether your fireplace is a good candidate. If your existing fireplace is a wood burning stove, the process is different. For more on that, see installing a wood burning stove in an existing fireplace.

Planning Your Conversion: Key Decisions

Before you purchase a gas insert, you need to make several important decisions. Taking the time to plan will ensure a smooth installation and a result you are happy with for years to come.

1. Choose the Right Gas Insert

Gas inserts come in a range of sizes, BTU outputs, and styles. Consider the following:

• Heating Capacity: Match the insert's BTU output to the square footage of the room. Our heating capacity BTU guide explains how to calculate the right size. For smaller spaces, see best fireplace for small spaces.
• Venting Type: Direct vent inserts are the most common and do not require a traditional chimney. They draw combustion air from outside and vent exhaust outside, making them highly efficient and safe. B-vent inserts use a vertical chimney. Learn more about the differences in our direct vent vs B-vent comparison.
• Style and Realism: Modern gas inserts feature realistic flames, glowing embers, and ceramic logs that mimic the look of a real wood fire. Some models offer reflective glass and hand-painted logs for added realism.
• Features: Remote control, thermostat, blower, and programmable timers are common features. A fireplace thermostat guide can help you decide if you need one.

2. Determine Whether You Need a Chimney Liner

Most gas insert installations require a stainless steel chimney liner. The liner serves two purposes: it protects the chimney from the corrosive byproducts of gas combustion, and it ensures proper draft. A liner is typically required by the insert manufacturer to maintain the warranty and by local codes. The cost of the liner depends on the height and configuration of your chimney. If you are also considering other chimney-related upgrades, you may find our article on average cost of chimney sweep and inspection useful for budgeting.

3. Plan for Gas Line Installation

If your home already has a gas line near the fireplace, the connection is relatively simple. If not, a licensed plumber or gas fitter will need to run a line from your main gas supply to the fireplace. This can add significant cost, especially if the fireplace is far from the gas meter. For a detailed breakdown of costs associated with gas fireplace installation, see our cost of installing a gas fireplace in an existing home.

4. Understand the Costs Involved

The total cost of converting a wood burning fireplace to a gas insert includes several components:

• Gas Insert Unit: Entry-level models are budget-friendly, while premium and high-end models with advanced features cost more.
• Chimney Liner: A required component for most installations.
• Gas Line Installation: If a new line is needed.
• Labor: Professional installation is strongly recommended.
• Permits: Required in most areas.
• Optional Accessories: Remote controls, blowers, decorative fronts, and hearth pads.

While we do not list specific prices here, you can find our detailed cost breakdown in the article cost of converting wood burning fireplace to gas. For a broader perspective on fireplace ownership costs, see fireplace cost breakdown and hidden costs of owning a fireplace.

Step-by-Step Conversion Process

Once you have chosen your gas insert and gathered your quotes, the installation process typically follows these steps. This is a general overview; your installer may follow a slightly different procedure based on your specific fireplace and local codes.

1. Inspection and Measurement A certified technician inspects your existing fireplace, chimney, and gas line. They measure the firebox to ensure the selected insert will fit. They also check for any masonry damage or obstructions that need to be addressed.
2. Chimney Liner Installation A flexible stainless steel liner is run down the chimney and connected to the insert's vent collar. The liner is typically insulated to improve draft and efficiency. The top of the chimney is fitted with a cap and termination kit.
3. Gas Line Connection If a gas line is not already present, a licensed plumber runs a line to the fireplace. The line is connected to the insert's gas valve. All connections are tested for leaks.
4. Insert Placement and Securing The gas insert is slid into the firebox and secured. The surround (the decorative frame that covers the gap between the insert and the fireplace opening) is attached. The insert is leveled and checked for proper clearances.
5. Electrical Connection (if applicable) Many gas inserts require electricity for the blower, remote control, or ignition system. The installer connects the insert to a nearby outlet or hardwires it according to code.
6. Testing and Commissioning The installer lights the insert, checks the flame pattern, tests the blower and thermostat, and verifies that all safety systems are functioning. They also check for proper venting and carbon monoxide levels.
7. Final Inspection and Cleanup A local building inspector may need to approve the installation. The installer cleans up the work area and provides you with operating instructions and warranty information.

For a more detailed look at the installation process, see our installing gas fireplace insert in existing fireplace guide. If you are also considering other replacement options, you might be interested in replacing a wood burning fireplace with a gas insert or even converting wood burning fireplace to electric.

Wood Burning Fireplace vs Gas Insert: A Side-by-Side Comparison

To help you understand the benefits of converting, here is a comparison of key factors between a traditional wood burning fireplace and a modern gas insert.

Factor	Wood Burning Fireplace	Gas Insert
Efficiency	Low (10-20%). Most heat escapes up the chimney.	High (70-90%). Heat is circulated into the room.
Convenience	Requires buying, storing, and loading firewood; ash cleanup.	Turn on with a switch or remote; no ash or mess.
Ambiance	Authentic crackling fire and smell.	Realistic flames, glowing embers, and ceramic logs.
Maintenance	Frequent chimney cleaning, ash removal, and creosote management.	Annual inspection and occasional glass cleaning.
Safety	Sparks, smoke, and creosote buildup risks.	Sealed combustion chamber; no sparks or smoke in the room.
Environmental Impact	Emits smoke and particulate matter.	Burns cleaner; natural gas is efficient.
Installation Complexity	Already installed.	Requires professional installation, liner, and gas line.
Best For	Those who value the traditional experience and have access to firewood.	Homeowners seeking convenience, efficiency, and clean operation.

For a broader comparison of gas vs electric vs wood, see our electric vs gas vs wood fireplace comparison. If you are also considering electric as an alternative, you may want to read about cost of converting wood fireplace to electric and replacing wood burning fireplace with electric.

Pros and Cons of Converting to a Gas Insert

Pros

• Significantly Higher Efficiency: A gas insert can heat your home far more effectively than an open wood fireplace.
• Convenience: No more chopping wood, hauling logs, or cleaning ashes. Start a fire with the push of a button.
• Cleaner Indoor Air: Because the combustion chamber is sealed, no smoke or particulates enter your living space.
• Consistent Heat: Many models include a thermostat and blower to distribute heat evenly.
• Design Flexibility: Gas inserts come in a variety of styles, from traditional to modern, with options for decorative fronts and surrounds.
• Increased Home Value: A high-efficiency gas insert is an attractive feature for potential buyers. See does a fireplace add value to your home.
• Lower Maintenance: No creosote buildup, no ash disposal. Annual inspections are still recommended.

Cons

• Upfront Cost: The initial investment for the insert, liner, gas line, and labor can be substantial. However, many homeowners find the long-term savings and convenience worth it.
• Dependence on Gas Supply: If you lose gas service, the insert will not operate.
• Less Authentic Sound and Smell: While flames are realistic, you won't get the crackling sound or wood smoke smell of a real fire. Some models offer crackling sound features, but it's not the same.
• Professional Installation Required: This is not a DIY project for most homeowners. Improper installation can be dangerous.
• Potential Need for Electrical Outlet: Many inserts require electricity for the blower and ignition.

For a broader look at the pros and cons of different fireplace types, see fireplace pros and cons by type.

Maintaining Your New Gas Insert

Once your gas insert is installed, maintenance is relatively simple compared to a wood burning fireplace. Here are the key tasks:

• Annual Inspection: Have a qualified technician inspect the insert, venting system, and gas connections annually. See annual fireplace inspection guide.
• Clean the Glass: Over time, a white film may develop on the glass. Clean it with a non-abrasive fireplace glass cleaner. See how to clean fireplace glass.
• Clean the Burner: Dust and debris can accumulate on the burner. Gently clean it according to the manufacturer's instructions. See how to clean a gas fireplace burner.
• Check the Blower: If your insert has a blower, keep it clean and free of dust. See blower fan not working for troubleshooting.
• Inspect the Venting: Ensure the vent cap and liner are free of obstructions, such as bird nests or leaves.
• Seasonal Checklist: Follow a seasonal maintenance routine. See seasonal fireplace checklist and winter fireplace preparation.

For a comprehensive guide to gas fireplace maintenance, see gas fireplace maintenance guide and fireplace maintenance schedule. If you experience any issues, our fireplace troubleshooting section covers common problems like gas fireplace won't light and pilot light keeps going out.

Frequently Asked Questions