What are Gas Logs? All About Gas Logs for your Fireplace

If you’ve always wanted that cozy glow of a fire without the hassle of a wood-burning fireplace, then a gas log fireplace may be just what you need. Gas logs offer all the ambience and warmth of a real, wood-burning fire without the consequent mess and maintenance involved. 

In this guide we explain how gas logs work. We also cover the two types of gas log sets to help you choose the right one for your needs.

What are Gas Logs?

Gas logs are artificial logs that sit inside a gas fireplace. Unlike traditional wooden logs, which require actual wood to be burned, gas logs are used with natural gas or propane to create flames that mimic the appearance of a wood-burning fire.

In terms of appearance, gas logs can be fashioned to look like virtually any kind of wood, from handsome oak to rustic sassafras to beachy driftwood.

Most vented gas logs are designed to make gas fireplaces more aesthetic, rather than being built for warmth. While gas logs do emit a bit of heat, it is not on the same level as a built-in gas fireplace or gas insert. Just like their real wood counterparts, much of the heat generated from a gas log set goes out the chimney. However, compared to built-in gas fireplaces or gas inserts, gas logs are considerably cheaper, and may be a more attractive option for those on smaller budgets. Ventless logs on the other hand do provide heat, but with much smaller and less realistic looking flames.

Advantages of Using Gas Logs

There are many benefits of using a gas log fireplace as opposed to a real wood-burning fireplace. These include:

• Less maintenance and mess – With gas logs, there’s no need to hire a chimney sweep to keep your chimney clean. You also don’t have to worry about keeping the hearth free of dust and soot, and perhaps best of all? There’s no need to chop wood!
• Safer – Because there is no uncontrolled flame, gas fireplaces are much safer to operate than their wood-burning counterparts. This makes them safer, especially for homes with small children or pets.
• Better for delicate lungs – Real wood tends to emit smoke byproducts that can irritate lungs. Gas logs have less byproducts, making them more suitable for young kids and elderly folks, or those suffering from asthma or respiratory ailments, thus dispensing the need for a separate air cleaner.
• Warmer – Gas fireplace logs produce more heat than standard fireplaces while retaining more heat, making them more efficient than standard wood-burning fireplaces.

For more information on gas log safety, check out our related entry: Are Gas Logs Safe & Efficient?

The 2 Types of Gas Logs

There are two different styles of gas logs: vented and ventless. The type of logs you’ll need depends on several factors, including appearance, efficiency and whether or not you have an existing fireplace.

Vented gas logs

When it comes to a realistic looking fire, vented gas logs are your best bet. They deliver large, yellow flames that resemble exactly what you’d see in a wood-burning fireplace without all the hassle and mess. Additionally, vented gas logs can be installed in an existing fireplace, making it easy for those who want to make the switch from a traditional, burning wood.

Just like a wood-burning fireplace, vented gas logs create carbon monoxide — therefore, they must operate with an open chimney or flue damper to properly exhaust the fumes. The downside of this is that most of the heat escapes, making these types of gas fireplace logs not as efficient as their ventless counterparts. In addition, vented gas logs require more fuel to operate than vent-free gas logs, so if you’re looking to save energy, they may not be the best option for you.

Pros: Vented gas logs look more realistic than ventless logs, making them ideal for those who value ambience.

Cons: Vented gas logs are less efficient than ventless logs and require more fuel to operate.

Ventless gas logs

While ventless gas logs are typically more expensive than vented gas logs, they distribute heat more efficiently throughout the room. Because they do not rely on vents to operate, vent-free logs are much better at keeping heat where it belongs: Inside your home. They also don’t use as much fuel as vented gas logs.

Ventless gas logs do not require a functioning chimney for installation, making them ideal for that old firebox you’re not sure what to do with or newly constructed homes. All you need is a gas line and you’re good to go.

The downside of ventless gas logs? They don’t look as pretty as vented logs, but this may not be an issue if you value efficiency over appearance. Also, if your room is well-sealed and insulated, moisture can build up and create condensation — although a little bit of humidity may be ideal if you live in a dry area!

The last thing to keep in mind about ventless gas logs is that they cannot be installed in a bedroom unless they’re 10,000 BTUs or less. Speciality log sets that meet these requirements have very small flames that are not clearly visible when burning.

Pros: Ventless gas logs are more efficient than vented gas logs and use less fuel. They also do not require a functioning chimney to operate.

Cons: Ventless gas logs do not look as good as vented gas logs when burning.

For more comparison details, check out: Vented or Vent Free Gas Logs: Which Do You Need?

Gas Log Styles

Since gas logs are mainly designed for aesthetic purposes, they come in a wide variety of styles. Popular ones include:

• Oak (natural red or aged)
• Sassafras
• Timber (natural or weathered)
• Driftwood
• Birch

Gas logs also come in virgin (newly chopped) or charred options, while others come in whole or split designs.

For more on gas log styles, check out our prior entry here.

How to Choose a Gas Log Set

Choosing the right gas log set for your home involves considering several factors, including fuel type, venting options, size, style, and overall functionality.

1. Determine the fuel type

If you have an existing supply line for natural gas, then a natural gas log set is for you. These are also typically cheaper to operate over time.

Otherwise, a propane gas log set is used for homes without natural gas service. Note that the fireplace requires a large propane tank.

2. Venting

Vented gas logs are used for gas fireplaces with a chimney or venting system. While they provide a more realistic flame, they are less efficient at heating since much of the heat goes out through the chimney.

Ventless or vent-free gas logs are used in fireplaces without a venting system. While the flames are not as realistic as vented logs, they provide more heat, and cheaper, and are easier to install.

Note that ventless gas logs may not be suitable for some areas due to building codes and regulations. Ventless logs also produce moisture and combustion byproducts, which may not be ideal for some families.

3. Measure the fireplace

Because fireplaces come in different sizes, you must first determine the dimensions of your fireplace to know the proper gas log size needed. Measure:

Width: Both front width and back width

Depth: The distance from the front glass to the back wall

Height: The distance from the base to the top of the fireplace opening

4. Sizing

With your fireplaces measurements in hand, you can categorize it into one of the following:

Small fireplace: 18 to 24 inches log sets

Medium: 24 to 30 inches log sets

Large: 30 inches and above log sets

5. Heat output

Heat output is measured in British Thermal Units (BTUs). The higher the BTU rating, the more heat is produced by the gas log set.

In general, ventless logs carry lowerBTUs than their vented counterparts,but put out more heat because it is not lost up the chimney.. They are also not available in all jurisdictions.

6. Appearance

Gas log sets are available in different styles. Some mimic the traditional appearance of wood, such as oak, pine or birch. They also differ in details, with more expensive log sets being hand-painted or featuring ember beds for a more realistic look.

Gas log sets are also available in less traditional styles like stone or glass. Some “logs” even have geometric shapes instead of the conventional log appearance, for a contemporary or avant garde look!

How to Install Gas Logs

To install gas logs, a gas fireplace system must be set up by a qualified gas equipment professional. Once that’s complete, you can install your gas logs yourself by following the included step-by-step instructions. Make sure you wear gloves while handling the logs, as they can cause skin irritation.

After reading the manual and donning protective equipment:

Step 1: Locate gas supply

Find the gas supply stub, usually located on the side of the firebox. Most log sets place the gas supply at the rear right of the burner system.

Step 2: Connect the gas line

If the system uses a pilot safety kit, install it between the burner and gas supply. Make sure the connections are tight and secure to withstand seasons of use.

Step 3: Seal the connections

Use a pipe dope or tape to seal all non-flared fittings. When in doubt, it’s better to use more tape than too little.

Step 4: Test for leaks

If you don’t have a leak detector, a low-tech solution can be soapy water spread around the gas line and connections. If there are no bubbles, then the gas line is properly sealed.

Step 5: Position logs

Follow the placement chart included with the log set for optimum performance. 

For more detailed instructions, check out How to Set Up and Install Gas Log Sets.

Our Recommended Gas Logs for 2024

Vented:

RH Peterson Real-Fyre Golden Oak Log Set (For Smaller Fireplaces) – Choice of Vented Burner and Valve Kit

Like all RH Peterson log sets, the Golden Oak log set is modeled from real oak log samples. The authentic look of Golden Oak is meticulously detailed in the hand painted art work of these logs. They are realistically designed including knots and hollows, to reflect a natural wood burning stack in your gas fireplace. 

To ensure durability, reinforced steel rods are carefully inserted into each log. The attention to detail in the log making and finishing process guarantees less chipping and breaking.

It is available in 12″ (R12) and 16″ (R16). Each set includes 6 refractory ceramic logs. Note that the G45 burner is not offered in the 12 inch size.

Ventless:

Everwarm Palmetto Oak Log Set – with Choice of Vent Free Burner

The Palmetto Oak log set is a refractory cement log set. Refractory concrete is a durable, long lasting material which will give you a beautiful focal point in your vent free firebox for years to come. The 18″ (EWPO18R) set includes 5 log pieces, the 24″ (EWPO24R) set includes 6 log pieces and the 30″ (EWPO30R) includes 7 pieces.

All Everwarm Log Sets fit on the same burner, but the size of the firebox required is based on the log set size. Everwarm offers Manual and Millivolt vent free burners in both Liquid Propane and Natural Gas.

Premium ventless log set:

Monessen MJ22 22″ Mojo Vent Free Log Set with Hi/Lo Thermostat Remote and Burner

In addition to the beauty of Monessen’s hand painted logs, this log set features the brand’s Natural Blaze Technology, an innovative burn system that provides taller and more lively flames for a more authentic looking fire. This allows your fire to dance instantly with bright yellow, flickering flames. Additionally, these logs are constructed with Burncrete technology to provide exceptional detail and strength for long lasting artistry.

The Luxury Series Mojo log set is a great choice for fireboxes that feature taller openings and viewing areas. Minimum fireplace opening requirements are 27″ front width x 20″ rear width with a 20″h x 14″d. The 22″ Mojo Log Set will add supplemental heat for up to 1900 sq. ft. with up to 29,000 / 28,000 BTUs (NG / LP).

Premium vented log set:

RH Peterson Real-Fyre Charred Angel Split Oak Log Set – G31 Vented Burner – Choice of Valve and Size

Modeled from real wood log samples, the Charred Angel Split Oak log set, is hand painted for that unique, realistic look you are looking for when buying a gas log set. The Charred Angel Split Oak Log Set is made from refractory ceramics to ensure the logs last and retain their strength at high temperatures.

Real-Fyre gas logs are environmentally friendly, drastically reducing pollutants being released into the air. They are the cleanest, most economical and most convenient alternative to burning real wood. In addition to showcasing your log set on 3 tiers, these eco-friendly logs produce beautiful, high, robust flames while using fewer BTUs than other vented burner systems.

The complete configured package will include the 6 or 8 piece Charred Angel Split Oak Log Set (choice of size), G31 Burner (choice of size and fuel type), Burner Valve (choice), Glowing Embers, Vermiculite (LP) or Sand (NG) and all other required hardware for installation.

Gas Logs FAQ

Gas Logs vs Wooden Logs: What’s the Difference?

Fuel Source

• Gas Logs: Use natural gas or propane as a fuel source.
• Wooden Logs: Burn actual wood.

Usage

• Gas Logs: Used in a gas fireplace or a modified wood-burning fireplace equipped with a gas line.
• Wooden Logs: Used in a wood-burning fireplace or stove.

Maintenance

• Gas Logs: Require minimal maintenance. No ash or soot needs to be cleaned out regularly.
• Wooden Logs: Produce ash and soot that need to be cleaned frequently. Chimneys also require periodic cleaning to remove creosote buildup.

Convenience

• Gas Logs: Can be turned on and off easily with a switch, remote control, or thermostat. There’s no need to chop or buy wood.
• Wooden Logs: Require manual lighting and stoking. Wood needs to be chopped, stored, and transported.

Environmental Impact

• Gas Logs: Produce fewer pollutants compared to burning wood. They don’t emit particulate matter or creosote.
• Wooden Logs: Burning wood releases smoke, particulate matter, and other pollutants into the air.

Appearance and Ambiance

• Gas Logs: Designed to look like real wood logs and can produce a realistic flame. However, some people feel they lack the authentic crackling sound and aroma of a wood fire.
• Wooden Logs: Provide a traditional fire experience with natural flames, crackling sounds, and the smell of burning wood.

Heat Output

• Gas Logs: Provide consistent and controllable heat. Some gas fireplaces can be very efficient in heating a room.
• Wooden Logs: Can produce a lot of heat, but are harder to control and can be less efficient, with some heat lost up the chimney.

Cost

• Gas Logs: Initial installation can be more expensive due to the need for a gas line and potentially a gas fireplace unit. Operating costs depend on gas prices.
• Wooden Logs: Typically cheaper upfront, especially if wood is sourced freely. However, purchasing wood can add up over time.

Gas Logs: Propane vs Natural Gas

Propane gas logs and natural gas gas logs are both designed to simulate the look and feel of a wood-burning fire, but they differ in the type of fuel they use and some other characteristics. Here are the main differences:

Fuel Source

• Propane Gas Logs: Use propane (liquefied petroleum gas or LPG) as the fuel source. Propane is stored in a tank and delivered to the gas logs through a regulated flow.
• Natural Gas Gas Logs: Use natural gas, which is typically supplied through a municipal gas line directly to the home.

Fuel Availability and Storage

• Propane Gas Logs: Require a propane tank for fuel storage, which can be refilled as needed. This makes them suitable for areas without natural gas service.
• Natural Gas Gas Logs: Connected directly to the home’s natural gas supply, offering a continuous and often more convenient source of fuel.

Efficiency and BTU Output

• Propane Gas Logs: Propane burns hotter than natural gas, meaning it can produce more BTUs (British Thermal Units) per unit of fuel. This can result in higher heat output.
• Natural Gas Gas Logs: Generally, natural gas burns cleaner but produces fewer BTUs per unit compared to propane. However, it is usually more cost-effective.

Installation Requirements

• Propane Gas Logs: Require a propane tank, which  to be installed outside the home, and a safe method of connecting the tank to the fireplace. Ventilation must be carefully managed to avoid propane buildup.
• Natural Gas Gas Logs: Need a connection to the home’s natural gas line. Installation can be simpler if natural gas service is already available in the home.

Cost

• Propane Gas Logs: Propane is typically more expensive per unit of energy compared to natural gas. However, the initial cost may vary based on tank installation and fuel delivery fees.
• Natural Gas Gas Logs: Generally, natural gas is cheaper than propane over the long term, especially if the home already has a natural gas connection.

Environmental Impact

• Propane Gas Logs: Propane is a clean-burning fuel, producing fewer emissions compared to burning wood. However, it is a fossil fuel and still contributes to carbon emissions.
• Natural Gas Gas Logs: Natural gas is also a cleaner alternative to wood, emitting fewer pollutants and greenhouse gasses. It is considered more environmentally friendly compared to propane.

Safety Considerations

• Propane Gas Logs: Propane is heavier than air and can accumulate at lower levels, posing a risk of explosion if there is a leak. Proper ventilation and leak detection are crucial.
• Natural Gas Gas Logs: Natural gas is lighter than air and disperses more easily, which can be safer in terms of leak management. However, it is still flammable and requires proper installation and maintenance.

Convenience

• Propane Gas Logs: Can be used in areas without natural gas infrastructure, making them versatile. However, the need to monitor and refill the propane tank can be less convenient.
• Natural Gas Gas Logs: Provide a continuous fuel supply with minimal maintenance, making them highly convenient for regular use.

Applications

• Propane Gas Logs: Ideal for rural or off-grid locations where natural gas is not available.
• Natural Gas Gas Logs: Suitable for urban and suburban areas with access to natural gas lines.

Both types of gas logs offer advantages depending on the specific needs and circumstances of the homeowner. Choosing between propane and natural gas logs will depend on factors such as fuel availability, installation costs, and long-term operating expenses.

How long do gas logs last?

The life of a gas log set is dictated by two factors:

Material

Gas logs are usually made of ceramic, which allows them to withstand very hot temperatures. Log sets that use cement logs will fade in appearance over time. Depending on use, they can begin to lose their appearance in 2-3 years.

Type

A well-maintained ceramic vented log set can last a very long time, in some cases 10 or more years. A well-maintained ventless log set of the same material can also last a long time, but, if heavily used, will begin to wear in 3-5 years.

For more information, read How Long Do Gas Logs Last & Gas Log Replacement.

Your Trusted Source for Gas Logs

All of the gas logs we carry here at Total Home Supply come with their own specific set of instructions. Be sure to follow all instructions carefully to keep yourself and your home safe. 

If you have any questions regarding our gas logs or other heating products, don’t hesitate to contact us. We’re ready to help put you on the path to a warmer, cozier home.