Adding gas logs to your fireplace is one of the easiest ways to enjoy the warmth and ambiance of a fire without the hassle of wood-burning maintenance. Whether you're considering vented gas logs, ventless gas logs, or an upgrade for an existing fireplace, this guide will walk you through the key factors to consider when selecting the right gas fireplace logs for your home.
What Are Gas Fireplace Logs?
Gas logs for fireplaces are ceramic or refractory cement logs that simulate real wood-burning fires while being fueled by natural gas or propane. They offer a convenient, clean-burning alternative to traditional wood fires and come in two main types: vented gas logs and vent-free gas logs.
Vented vs. Ventless Gas Logs: What’s the Difference?
Vented Gas Logs
- Designed to be used with a functioning chimney or flue.
- Provide a realistic flame pattern with taller, more natural-looking flames.
- Require an open damper, which means some heat escapes up the chimney.
- Ideal for homeowners who prioritize aesthetics over maximum heat output.
Ventless Gas Logs (Vent-Free or Unvented Gas Logs)
- Do not require a chimney or venting system.
- Produce a high level of heat efficiency, as no heat is lost through a vent.
- Operate with a lower, controlled flame that burns cleanly and meets safety regulations.
- May not be allowed in some states or municipalities due to air quality regulations.
How to Choose the Right Gas Logs for Your Fireplace
1. Check Your Existing Fireplace Type
-
Existing wood-burning fireplace: Can be converted to gas fireplace logs using either vented or ventless gas logs. The fireplace must have an open front. An enclosed fireplace will cause the safety features to shut the unit off.
-
Prefabricated gas fireplace: Must use the type of gas logs specified by the manufacturer.
- Outdoor fireplaces: Require specially rated gas log fireplace sets. Read more about outdoor gas fireplaces.
2. Choose the Right Size
- Measure the fireplace width, height, and depth to ensure the gas log set fits properly.
- Allow for adequate clearance around the logs for proper airflow and safety.
3. Determine Your Fuel Type
- Natural Gas: Requires a dedicated gas line. Be sure to select units that can run on natural gas.
- Propane: Requires a propane tank and additional safety considerations. Be sure to select units that can run on propane.
4. Consider Flame and Heat Output
- Vented gas logs offer the best flame realism but moderate heat as the vent can cause heat to be lost.
- Vent-free gas logs provide high efficiency and more heat output.
5. Choose a Gas Log Style
Gas logs come in a variety of styles, including:
- Oak (classic and natural)
- Birch (light and modern)
- Driftwood (coastal and rustic)
- Split logs (detailed and textured)
Installation & Cost Considerations
How Much Does It Cost to Install Vented Gas Logs?
- Installation costs range from $500 to $1,500, depending on chimney condition and gas line availability.
- Gas fireplaces require professional installation to ensure safety and compliance.
- If you already have a gas line and existing fireplace, the cost decreases considerably.
How Much Does It Cost to Install Ventless Gas Logs?
- Costs range from $300 to $1,000 for installation, typically lower than vented options.
- No chimney modifications needed, but professional installation is still recommended.
- If you already have a fireplace and gas line, costs decrease considerably.
Maintenance & Safety Tips
- Annual inspections ensure safe and efficient operation.
- Clean burners and logs regularly to prevent soot buildup.
- Ensure proper ventilation if using ventless gas logs to avoid indoor air quality issues.
- Install carbon monoxide detectors for added safety.
FAQs About Gas Log Fireplaces
Are Ventless Gas Logs Safe?
Yes, vent-free gas logs are designed to burn cleanly and meet safety regulations. However, proper ventilation and adherence to manufacturer guidelines are essential. Read "Are Gas Fireplaces Bad for Your Health?"
Can I Install Gas Logs in My Existing Fireplace?
Yes, as long as your fireplace meets the required clearances, is open front, and has access to a gas line, you can install gas fireplace log sets.
Do Gas Logs Smell?
Newly installed gas logs may emit a slight odor due to curing. Vent-free logs can sometimes produce a faint smell when burning, especially with dust or pet hair present.
Are Gas Logs Energy-Efficient?
Ventless gas logs are highly efficient, as 99% of the heat stays in the room. Vented gas logs are less efficient but offer superior flame aesthetics.
Shop High-Quality Gas Log Fireplace Sets
Ready to upgrade your fireplace with gas logs for your fireplace? Explore our wide selection of vented and ventless gas logs at Mantels Direct and find the perfect match for your home.
Top Picks: Vented Log Sets


Empire Comfort Systems Ponderosa
Shop All Direct Vent Gas Log Sets
Top Picks: Ventless Gas Log Sets
Grand Canyon Split Oak or Red Oak