When the temperature drops, nothing beats the inviting glow of a roaring fire to keep you warm all day long!

But in the world of home heating, the choice between gas inserts and gas fireplaces sparks a fiery debate. Both options offer convenience, efficiency, and a cozy ambiance — but which one truly delivers the ultimate warmth, style, and value for your home?

In this ultimate showdown, we’ll dive deep into the differences between gas inserts and gas fireplaces, what we like and some considerations, their heating capabilities, cost, and more! Whether you’re upgrading an existing fireplace, designing a new living space, or simply craving a more efficient heat source, this guide has you covered.

So, what are you waiting for? Let’s start this HOTTEST showdown!

Quick Comparison

Category	Gas Fireplaces	Gas Inserts
Definition	A heating unit that operates on natural gas or propane, is often installed as a standalone or built-in unit.	A unit designed to fit into an existing fireplace opening, converting it into a gas-powered system.
Installation	Requires professional installation, often involving venting systems and structural modifications.	Fits into existing fireplaces, requiring less renovation and simpler installation.
Design Options and Flexibility	Available in multiple styles (linear, see-through, traditional, outdoor).	Limited to the dimensions of the existing fireplace opening.
Heat Output (BTU)	High output (5,000 - 100,000 BTUs), ideal for heating large areas.	Moderate output (8,500 - 40,000 BTUs), suitable for supplemental heating.
Area Coverage	Heats up to approximately 5,000 square feet.	Heats up to approximately 2,000 square feet.
Efficiency	Varies by type; direct vent and ventless models offer better efficiency.	Varies by type; High efficiency for ventless and less for direct vent  due to closed combustion and reduced heat loss.
Cost	Higher upfront and installation costs.	Cost-effective upgrade for existing fireplaces.
Maintenance	Requires annual cleaning and professional inspections.	Requires regular cleaning of burner and glass; annual inspections recommended.
Environmental Impact	Cleaner burning than wood; renewable gas options available for reduced emissions.	Cleaner burning than wood; renewable gas options available for reduced emissions.
Suitability	Best for new constructions, major renovations, or large spaces needing primary heat sources.	Ideal for older homes with existing fireplaces or those seeking an affordable upgrade.

Pros and Cons

Gas Fireplaces

Pictured: Empire Boulevard 48" Millivolt Control With On/Off Remote, Natural Gas Vent Free Linear Fireplace

Pros

Cons

Real Flames: Gas fireplaces provide the ambiance of a traditional fireplace with authentic flames, enhancing the coziness of a room.  High Heat Output: They are capable of quickly and efficiently heating large areas or open spaces.  Convenience: Gas fireplaces are easy to use, with features like remote controls and thermostats for hassle-free operation.  Design Flexibility: They are available in various styles, such as linear, see-through, and traditional, to match different interior designs.  Low Maintenance: Since they do not produce ash or soot, gas fireplaces require minimal cleaning compared to wood-burning fireplaces.

Higher Installation Costs: Gas fireplaces often require professional installation, venting, and potential structural modifications, increasing the overall cost.  Fuel Dependency: They rely on natural gas or propane, making them subject to availability and price fluctuations.  Venting Requirements: Direct vent models need proper venting, which may limit placement options within the home.  Air Quality Concerns: Vent-free gas fireplaces can affect indoor air quality, especially in smaller or poorly ventilated rooms.  Environmental Impact: While cleaner than wood-burning options, gas fireplaces still emit CO2, contributing to greenhouse gas emissions.

Gas Inserts

Pictured: Monessen 33" Solstice Traditional Style Vent Free Gas Insert Fireplace

Pros

Cons

Real Flames: Gas inserts provide authentic flames, making them an excellent option for creating a warm and inviting atmosphere.  Energy Efficient: With a closed combustion design, gas inserts minimize heat loss and maximize energy efficiency.  Cost-Effective Upgrade: Gas inserts are designed to fit into existing fireplaces, reducing the need for expensive renovations.  Cleaner Burning: They produce fewer emissions than wood-burning fireplaces, improving indoor air quality.  Customizable Media: Homeowners can choose from a variety of media, such as logs or glass, to match their desired aesthetic.

Size Constraints: Gas inserts must fit within the dimensions of an existing fireplace opening, which limits design flexibility.  Lower BTU Range: Gas inserts are often better suited for supplemental heating rather than providing heat for large spaces.  Fuel Dependency: They rely on natural gas or propane, making them subject to availability and price fluctuations.  Air Quality Concerns: Vent-free gas inserts can affect indoor air quality, especially in smaller or poorly ventilated rooms.  Regular Maintenance Needed: To ensure safety and efficiency, gas inserts require annual inspections and routine cleaning.

Which Gas Unit to Choose?

Chose Gas Fireplaces If…

Pictured: Napoleon Riverside 36 Clean Face Outdoor Gas Fireplace

• You are building a new home or planning on making major renovations.

• You need a primary heating source for large spaces.

• You value design versatility and the ability to make a bold style statement.

• You are okay with a higher upfront cost for installation.

Choose Gas Inserts If…

Pictured: Empire Loft 30" Millivolt Control With On/Off Switch, Natural Gas Vent Free Medium Fireplace Insert

• You own an older home with an existing fireplace opening.

• You want a cost-effective way to upgrade an old wood-burning fireplace.

• Your focus is on supplemental heating and energy efficiency.

• You have a limited budget and prefer a straightforward installation.

Starting With The Basics

What Are Gas Fireplaces?

Pictured: Majestic Vesper 36" Traditional Outdoor Vent-Free Gas Fireplace With Herringbone Refractory

A gas fireplace is a type of fireplace that doesn't need wood to burn. Instead, it uses natural gas or propane to create flames. This makes it much easier to use than traditional wood-burning fireplaces.

When activated, gas flows into the burner of the fireplace. This gas is ignited by either an electronic ignition or a pilot light system. The intensity of the flame and the heat output can then be controlled using the model's adjustable settings. To distribute the warmth evenly throughout the room, a blower system circulates the heated air.

Different Types of Gas Fireplaces

Direct Vent A direct vent fireplace uses a sealed combustion system that vents directly outdoors. It is safe and efficient as it doesn't use indoor air for combustion. This type of fireplace is ideal for maintaining indoor air quality and is often preferred for its energy efficiency and versatility in installation locations within a home.	Pictured: Napoleon Altitude™ X Series 42" Direct Vent Gas Fireplace
Ventless A ventless gas fireplace does not require external venting, making installation flexible and suitable for many indoor environments. However, concerns about indoor air quality due to emissions are significant, as it burns cleaner but still releases some combustion products into the room.	Pictured: Monessen 48" Artisan Vent Free Linear Gas Fireplace with IPI Plus Electronic Ignition
B-Vent B-vents use natural venting through a chimney or pipe to the roof. This type is less efficient because it uses indoor air for combustion and vents it outside, resulting in some heat loss. B-vent fireplaces are a traditional option that is simpler in design and often cost-effective.	Pictured: Empire Keystone 34" Millivolt Control With Flush Face, Natural Gas B-Vent Deluxe Fireplace

Design Options

Traditional Traditional gas fireplaces are made for indoor use and look like classic wood-burning fireplaces. They often have realistic logs and flames. These fireplaces can be built into a wall, a mantel, or used as inserts for old wood-burning fireplaces. They can be vented to remove smoke or vent-free for easier setup. Traditional gas fireplaces add heat and style to a home without the mess of wood.	Pictured: Empire Carol Rose Coastal 36" Stainless Steel Millivolt Control, Natural Gas Traditional Premium Outdoor Fireplace
Linear Linear fireplaces feature a slim, elongated opening with a modern aesthetic, often wall-mounted, offering a contemporary look. These fireplaces are popular in modern homes for their stylish appearance and the ability to fit into narrow spaces while providing significant visual impact.	Pictured: Empire Loft 46" Millivolt Control With On/Off Switch, Natural Gas Direct Vent Linear Fireplace
See-Through See-through fireplaces are built into walls to provide a view from both sides, enhancing the decorative appeal of spaces. They serve as a central feature in a room or between two spaces, offering warmth and visual continuity.	Pictured: Superior VRE4672 72" Linear Contemporary Outdoor Vent-Free Natural Gas Fireplace With Electronic Ignition
Outdoor Outdoor gas fireplaces are made for patios, decks, and backyards. They are built to handle the weather and provide warmth.  They use natural gas or propane and come in different styles like fire pits, built-in models, or modern linear designs. Outdoor fireplaces often include weatherproof materials and easy-start options.	Pictured: Kingsman 42" OFP42 IPI Outdoor Gas Fireplace

What Are Gas Inserts?

Pictured: Monessen Aria 36" Traditional Vent Free Liquid Propane Gas Fireplace With IPI Ignition

A gas insert is a heating unit designed to fit inside an existing fireplace, transforming it into a cleaner, more efficient, and easy-to-use heat source. Powered by natural gas or propane, these inserts offer a modern and hassle-free alternative to traditional wood-burning fireplaces.

However, unlike traditional fireplaces that often lose much of their heat through the chimney, gas inserts are closed systems that trap and circulate warmth more effectively within a room. Additionally, they produce less smoke and ash, making them a cleaner and more convenient heating option.

Different Types of Gas Fireplace Inserts

Direct Vent A direct vent fireplace uses a sealed combustion system that vents directly outdoors. It is safe and efficient as it doesn't use indoor air for combustion. This type of fireplace is ideal for maintaining indoor air quality and is often preferred for its energy efficiency and versatility in installation locations within a home.	Pictured: Majestic Trilliant Medium 30" Traditional Direct Vent Natural Gas Fireplace Insert With IntelliFire Touch Ignition System
Ventless A ventless gas fireplace does not require external venting, making installation flexible and suitable for many indoor environments. However, concerns about indoor air quality due to emissions are significant, as it burns cleaner but still releases some combustion products into the room.	Pictured: Empire Innsbrook 27" Millivolt Control With On/Off Switch, Propane Gas Vent Free Small Fireplace Insert
Other Contemporary Designs Some gas inserts come as fireboxes only, allowing you to add your own log sets or burners for a custom look. This gives you the freedom to choose a style, whether you prefer traditional logs or a modern, clean look. Firebox-only inserts are available in vented or vent-free options, so you can pick what fits your space best. The main benefit of these fireboxes is the flexibility to create a personalized fireplace while enjoying the warmth of a gas insert. Vent-free fireboxes don’t need a chimney, making them easy to install in many rooms without major renovations.	Pictured: Monessen 36" Attribute Universal Circulating Vent Free Firebox with Radiant Face and Multitonal Brown/Gray Reversible Interior Panels

Heating Capabilities and Area Coverage

Gas Fireplaces

A typical gas fireplace can produce about 5,000 - 70,000 BTUs per hour, making them ideal for open areas and large spaces. However, the BTU/hr output highly depends on the type of fireplace.

• Ventless Models: Generates around 5,000 to 40,000 BTUs per hour. The lower end of this range (around 5,000 BTUs) is suitable for supplemental heating in small rooms or apartments, while the higher end can heat larger spaces effectively.

• Direct Vent and B-Vent Models: Often produce between 20,000 and 50,000 BTUs per hour, making them adequate for heating individual rooms or moderately sized spaces. Their design allows for efficient heating with proper venting to the outside.

• Linear and See-Through Fireplaces: Gives off 20,000 to 70,000 BTUs per hour, making them powerful enough to heat larger areas or act as focal design elements in spacious environments. Their sleek design often complements modern interiors.

To learn more, check out the table below. It contains different types of fireplaces along with their estimated BTU/hr.

Type of Gas Fireplace	Approximate BTU/hr
Direct Vent Fireplaces	20,000 - 50,000
Ventless Fireplaces	5,000 - 40,000
B-vent Fireplaces	20,000 - 50,000
Linear Fireplaces	20,000 - 70,000
See-Through Fireplaces	20,000 - 70,000
Outdoor Fireplaces	18,000 - 100,000

Area Coverage

Gas fireplaces can heat an area of up to 5,000 square feet depending on their type or model. Additionally, room size and layout, insulation, and positioning can also affect how the fireplace circulates heat.

• Up to 500 Square Feet: Smaller units like stoves or ventless models, typically outputting around 5,000 to 10,000 BTUs, are enough to heat small indoor spaces.

• 500 to 1,000 Square Feet: Medium-sized fireplaces such as B-vent and smaller direct vent models, with BTU ratings ranging from 12,000 to 20,000, are recommended for warming these areas effectively.

• 1,000 to 1,800 Square Feet: Larger built-in or linear models with outputs ranging from 25,000 to 35,000 BTUs will provide enough warmth for bigger rooms.

• 1,800 to 5,000+ Square Feet: These are reserved for outdoor units that are capable of outputting up to 100,000 BTUs of heat.

The table below shows each type of gas fireplace along with its approximate area of coverage measured in square feet:

Type of Gas Fireplace	Area of Coverage (sq ft)
Direct Vent Fireplaces	1,000 - 2,500
Ventless Fireplaces	250 - 2,500
B-vent Fireplaces	1,000 - 1,500
Linear Fireplaces	1,000 - 3,500
See-Through Fireplaces	1,000 - 3,500
Outdoor Fireplaces	900 - 5,000

Gas Inserts

Gas inserts are an excellent way to provide warmth and ambiance to your home. With various options available, including vent-free, direct vent, and B-vent models, it’s essential to understand the differences in heating capabilities, efficiency, and installation requirements.

The table below outlines the key features of each type of gas insert to help you choose the best heating solution for your needs. Please note that the values provided are approximate and may vary based on specific models and manufacturers.

Type of Gas Insert	Fuel Type	Heating Capacity (BTUs)	Efficiency
Vent-Free	Natural Gas	14,000 - 40,000	99%+
	Propane	10,000 - 39,000
Direct Vent	Natural Gas	8,500 - 40,000	75% - 85%
	Propane	10,000 - 35,000

Area Coverage

Vent-free gas inserts are highly efficient units that operate without the need for a chimney or vent system, which ensures maximum heat retention. By eliminating venting, these units direct all produced heat into the room, allowing them to cover a wide range of areas effectively.

• 700 to 2,000 Square Feet (NG): These are ideal for large living spaces or open-concept designs. They provide steady, cost-effective heating.

• 500 to 2,000 Square Feet (LP): Propane versions are versatile and suitable for cabins, mobile homes, or areas without natural gas.
  While highly efficient, vent-free inserts may be restricted by local building codes and are not recommended for environments where air quality is a primary concern.

Direct vent gas inserts are designed with a sealed combustion system that draws air from outside for combustion and vents exhaust outdoors. This innovative system ensures excellent indoor air quality, making them a safe choice for tightly sealed homes and bedrooms. While some heat is lost through venting, these inserts provide efficient and reliable area coverage.

• 400 to 2,000 Square Feet (NG): These inserts are versatile, fitting smaller rooms or larger areas in homes with existing chimneys.

• 500 to 1,800 Square Feet (LP): These are clean and efficient options for medium-sized spaces and locations without natural gas infrastructure. Although some heat is lost through venting, direct vent models are favored for their safety, eco-friendliness, and ability to maintain a healthy indoor environment.

Below is a table summarizing the approximate area coverage each type of gas insert could heat up. Remember that the area coverage is proportional to the BTU capacity of the unit. This means that as the BTU increases, so does the area coverage.

Type of Gas Insert	Fuel Type	Area Coverage (sq. ft.)
Vent-Free	Natural Gas	700 - 2,000
	Propane	500 - 2,000
Direct Vent	Natural Gas	400 - 2,000
	Propane	500 - 1,800

Heating Capabilities and Area Coverage: Fireplaces Win!

Gas fireplaces can deliver a higher range of heat output (5,000 - 100,000 BTUs), making them more suitable for large, open spaces or primary heating needs. Additionally, they can cover up to 100,000 square feet of space, which is especially important for homes in colder climates where maintaining consistent warmth across larger areas is essential. 

Gas inserts, while efficient, typically offer moderate heat output (8,500 - 40,000 BTUs) and are better suited for supplemental heating or small-to-medium-sized spaces. They can heat up to 2,000 square feet of space, which is not a lot compared to gas fireplaces. All in all, the versatility of gas fireplaces in managing heat output across various room sizes gives them an edge in this category.

Cost

Gas Fireplaces

Initial Purchase Costs

When considering the purchase of a gas fireplace, the initial financial commitment includes several key costs. Unit prices vary widely, typically ranging from $170 to $24,000, depending on the style and features of the fireplace.

Type of Gas Fireplace	Price Range (USD)
Direct Vent Fireplaces	$1,600 - $15,200
Ventless Fireplaces	$200 - $11,800
B-vent Fireplaces	$1,500 - $23,700
Linear Fireplaces	$1,200 - $23,700
See-Through Fireplaces	$2,800 - $13,000

Note: Prices may vary depending on the brand, unit, and whether you bought the product from the manufacturer or from an authorized reseller.

Installation Costs

Installation costs also vary significantly because they are influenced by the specific style of the fireplace and the complexity of the installation, which may involve structural modifications and ventilation setup.

Cost Component	Details	Typical Range
Installation Costs	Varies by type (vented, vent-free, direct vent), complexity, structural modifications, and ventilation setup.	$2,500 - $10,000+
Ventilation Setup	Additional costs for venting materials and labor are required for vented and direct vent models.	$500 - $2,500+
Gas Line Installation	May require installing a new gas line or modifying existing ones.	$300 - $1,000+
Finishing Costs	Includes materials (e.g., mantels, stone, tile) and labor for aesthetic finishing.	$500 - $5,000+
Permits and Inspections	Local building codes may require permits and inspections, adding to the total cost.	Varies by location

Note: The prices shown above are estimated values, as costs may vary depending on where you live. 

Operating Costs

Gas fireplaces operate by burning fossil fuels such as natural gas or propane. Propane, a liquid form of petroleum gas, is derived from natural gas processing and is typically easier to store because it can be kept under lower pressure compared to natural gas, which is primarily methane and must be stored under high pressure due to its gaseous state.

Cost Component	Details	Typical Range
Annual Maintenance	Regular maintenance, including cleaning and safety inspections.	$100 - $200 per year
Fuel Costs (Natural Gas)	Based on local utility rates and fireplace usage. Typically less expensive than propane.	$0.50 - $2.00 per hour
Fuel Costs (Propane)	Depends on local propane prices and usage. Generally higher than natural gas.	$2.00 - $5.00 per hour

Note: The prices shown above are estimated values, as costs may vary depending on where you live. 

Gas fireplaces, including direct vent and linear models, typically consume between 20,000 and 60,000 British Thermal Units (BTUs) per hour. With the average price of natural gas around $0.20 per therm (100,000 BTUs equal to one therm), the operating costs are estimated to be between $0.20 and $0.60 per hour when in use.

Additionally, gas fireplaces offer operational conveniences and lower maintenance compared to traditional wood-burning fireplaces. They eliminate the need for chimney cleaning or extensive inspections and do not require the handling and storage of wood. These factors contribute to cost savings and make gas fireplaces an economically attractive option over the long term.

The average running cost of a gas fireplace highly depends on the varying prices of fuel across the US. The table below shows the estimated cost of running a fireplace per hour.

Type of Gas Fireplace	Estimated Running Cost per Hour in $ (USD)
Direct Vent	~ $0.20 - $0.40
Ventless	~ $0.05 - $0.40
B-vent	~ $0.20 - $0.30
Linear	~ $0.20 - $0.60
See-Through	~ $0.20 - $0.50

Note: The prices shown above are estimated values, as costs may vary depending on where you live. 

Gas Inserts

Initial Purchase Cost

Gas inserts come in various styles and configurations, which can significantly impact their pricing. Factors such as the type of gas used (natural gas or propane), the size of the insert, and the specific features included—like advanced technology or design aesthetics—will all influence the overall cost.

Type of Gas Insert	Price Range (USD)
Ventless Gas Inserts	$500 - $5,600
Direct Vent Gas Inserts	$2,000 - $5,000
Natural Gas Inserts	$1,800 - $5,000
Propane Gas Inserts	$1,800 - $5,000

Note: Prices may vary depending on the brand, unit, and whether you bought the product from the manufacturer or from an authorized reseller.

Installation Costs

When planning to install a gas insert, it's important to consider the installation costs. This can vary greatly depending on how complex the job is. Factors that influence these costs include the type of gas insert being installed, the existing infrastructure (such as chimneys or gas lines), and any additional modifications needed for safe and effective operation.

It is highly recommended that a professional be hired to install gas inserts to meet local codes and safety standards. Below is a table showing estimated costs for professional installation, giving you a clearer idea of what to expect.

Installation Component	Estimated Cost (USD)
Professional Installation	$500 - $2,000
Venting System (if needed)	$300 - $1,000
Gas Line Connection	$200 - $600
Additional Components (thermostats, etc.)	$100 - $300

Note: The prices shown above are estimated values, as costs may vary depending on where you live. 

Operating Costs

The operating costs of a gas insert depend on your gas consumption and the local price of gas. By understanding these factors, you can more accurately budget your heating expenses and plan for seasonal cost fluctuations. This information is essential for homeowners who want a more cost-effective and energy-efficient heating solution.

The table below illustrates estimated gas usage in gallons per month, the average cost per gallon, and the resulting estimated monthly cost. These estimates provide a straightforward view of potential expenses based on typical gas insert usage.

Gas Usage (gallons/month)	Average Cost per Gallon ($)	Estimated Monthly Cost ($)
5	3.50	17.50
10	3.50	35.00
15	3.50	52.50

Note: The prices and values shown above are estimated values, as quantity and cost may vary depending on where you live. 

Cost: Inserts Win!

Gas inserts are generally more affordable both in terms of initial purchase and installation costs. With prices starting as low as $500 for vent-free models and installation costs ranging from $500-$2,000, they offer a cost-effective solution for upgrading old wood-burning fireplaces.

Gas fireplaces, on the other hand, can cost $1,600-$24,000 depending on the style and require installation costs that often exceed $2,500 due to structural modifications and venting. For budget-conscious homeowners or those seeking a simple upgrade without major renovation expenses, gas inserts are the clear winner.

Installation Overview

Gas Fireplaces

All gas fireplaces need a connection to a gas line or a propane supply. Additionally, before installing gas fireplaces, it's essential to familiarize yourself with the local regulations in your area. For example, ventless gas fireplaces are banned in California and are subject to specific restrictions in New York City.

Before anything else, make sure to always put your safety first by hiring a certified gas professional to install your gas units, lines, and venting systems. Make sure to have enough clearance before igniting the fireplace, especially if you are using a ventless unit, as they could catch fire easily.

Make your licensed professional also install a carbon monoxide detector to protect you and your family from CO poisoning. Remember, Carbon Monoxide is a colorless, odorless gas that can accumulate if the fireplace is improperly vented or if there’s a gas leak, so placing a detector in the same room as the fireplace provides an early warning of dangerous levels.

Lastly, always adhere to the specific installation instructions provided by the manufacturer. This will not only ensure your safety but also keep your warranty intact. 

Now that you know the basics, here are the specific installation steps for different types of gas fireplaces.

Ventless Gas Fireplaces Ventless, or vent-free, gas fireplaces don’t require chimneys or flues, which makes them easy to install. While great for almost any room, these units aren’t very compatible with newly built houses, as these buildings are tight and lack enough airflow. As such, it’s safer to put these units in open areas with lots of ventilation. An oxygen depletion sensor (ODS) is also needed to automatically shut off the unit if oxygen levels drop too low. Additionally, some units require an outlet for features like blowers or remote controls.	Pictured: Superior VRT4542 42" Traditional Vent-Free Gas Fireplace With White Stacked Refractory Panels
Direct Vent Gas Fireplaces Direct vent gas fireplaces need a sealed two-pipe venting system that expels exhaust and draws in fresh air through an exterior wall or roof. A nearby outlet may also be necessary for fans, ignition systems, or remotes.	Pictured: Napoleon B46 Ascent 46" Direct Vent Gas Fireplace
B-Vent Gas Fireplaces B-Vent gas fireplaces require a vertical flue that vents exhaust through the roof, relying on indoor air for combustion. Additionally, the room where the fireplace is built should have adequate air circulation.	Pictured: Malm Zircon 34" Matte Black Freestanding B-Vent Gas Fireplace
Outdoor Gas Fireplaces For outdoor gas fireplaces, ventless models are common, but direct vent or open vent designs are also available. Before installing and using these units, check if they are rated for outdoor use.	Pictured: Majestic 48" Lanai Contemporary Outdoor Linear Vent Free Gas Fireplace with IntelliFire Plus Ignition System

Gas Inserts

Just like gas fireplaces, gas inserts also need either a natural gas or propane line. Call your local certified gas professional to install these for you. Take note that some units may also require a regulator to manage gas pressure. Additionally, it's essential to familiarize yourself with the local regulations in your area. For example, ventless gas fireplaces are banned in California and are subject to specific restrictions in New York City.

A very important thing to do before you install a gas insert is to call a certified professional gas technician and NEVER EVER do it yourself. 

Since you're not installing it yourself, here is a quick summary of what your licensed technician would do: First, they will thoroughly inspect the existing fireplace, including the chimney or flue, to ensure it is clear of any obstructions. A properly sized flue liner is usually required to safely and efficiently vent exhaust, as it connects the insert to the chimney.

Second, they will also keep in mind that inserts with fans, remote controls, or electronic ignition require a nearby power outlet. Additionally, some models offer battery backup for operation during power outages. Third, they will maintain proper clearances from combustible materials like walls and mantels, and check if the insert fits securely within the fireplace opening.

Fourth, the technician will install a carbon monoxide detector in the room for safety, and tightly seal all venting connections to prevent exhaust leaks. Lastly, add decorative surround panels or trim, and seal all edges and connections to improve efficiency and prevent drafts for a polished appearance.

Ventless Gas Fireplaces Ventless gas fireplaces are easy to install since they don’t need chimneys or flues. However, they rely on the room’s ventilation to operate, so using them in airtight and newly built homes isn’t a good idea because of limited airflow. Additionally, these fireplaces need an oxygen depletion sensor (ODS) to shut them off if oxygen levels get too low. Some models also need an outlet for blowers or remote controls.

Pictured: Monessen Exacta 42" Vent Free Circulating Clean Face Firebox

Direct Vent Gas Fireplaces Direct vent gas fireplaces use a sealed two-pipe system to vent exhaust and pull in fresh air through a wall or roof. Some models may also need a nearby outlet for fans, ignition, or remotes.

Pictured: Napoleon 34" Oakville X4 Direct Vent Gas Fireplace Insert

Installation: Inserts Win!

Gas inserts are easier and less invasive to install, as they are designed to fit into existing fireplace openings, minimizing structural modifications. They often require only a gas line connection and possibly a flue liner for venting, making them a cost-effective choice.

Gas fireplaces, however, often necessitate professional installation, significant structural work, and the addition of venting systems, which can drive up costs and complexity. This makes gas inserts more practical for homeowners looking for straightforward upgrades with less disruption to their homes.

Note: Both gas units require a certified gas professional to be installed.

Cleaning and Maintenance

Gas Fireplaces

Cleaning

If this is your first time cleaning your gas fireplace, you might want to consider calling a professional first to avoid potential problems like misaligning the thermocouple due to rough handling. Hiring a certified technician also makes the cleaning and inspection process smoother.

If you’re confident enough with your skills, start off by reading the owner’s manual. Pay close attention to the safety warnings and always make sure that the pilot light is off, the gas valve is closed, and the fireplace has completely cooled.

When you’re ready to clean, begin by taking a photo before disassembly so that you’ll have a guide when it’s time to reassemble. Next, carefully pick apart the fireplace as outlined in the manual. Remove the glass panel and, if necessary, use a screwdriver to take out decorative logs. Place these components on a protective surface like a drop cloth or towel to prevent damage. 

For cleaning the glass panel, lay it on old newspapers or a plastic sheet to protect the work surface. Use a soft cloth and household window cleaner for general cleaning. A ceramic cooktop cleaner works well for stubborn soot marks. Wipe away any residue with a damp cloth, then dry thoroughly to prevent streaks. Reattach the panel only after ensuring all cleaners have evaporated. Wait at least 30 minutes before using.

To clean the fireplace interior, use the wand attachment of your vacuum cleaner to remove dust and debris. If your fireplace has small lava rocks, cover the vacuum wand with cheesecloth or an old stocking to prevent them from being sucked up. This makeshift filter allows you to clean safely without losing the rocks.

If you have vented gas logs, gently brush off soot with a soft-bristled brush, like a paintbrush, after removing them according to the manual. Avoid washing or damp-wiping the logs, as moisture can damage their finish. For vent-free logs, refrain from cleaning them yourself; only a qualified technician should handle maintenance to avoid safety risks.

Routine battery replacement is also important. Replace the batteries in your fireplace remotes twice a year, much like with smoke and carbon monoxide detectors, to ensure safety in emergencies. 

Lastly, don’t forget to use the picture that you took at the start as a guide to piece your unit back together.

Maintenance

Inspect your fireplace regularly for signs of wear, such as discoloration, cracks in faux logs or rocks, or excess moisture around the unit. Replace damaged components as needed. If you notice structural issues, moisture buildup, or cracked paint, contact a professional for assistance. Always ensure a working carbon monoxide detector is installed nearby for added safety.

For thorough maintenance, hire a professional technician or certified chimney sweeper annually, ideally before the heating season. Professionals will inspect for issues like rust, corrosion, bird nests in vents, or leaks in connections and supports. They will also examine outdoor chimneys for damage caused by weather, such as excessive condensation or structural wear. Keeping your fireplace well-maintained and inspected ensures it remains safe, efficient, and ready for use year-round.

Gas Inserts

Cleaning

If this is your first time cleaning your gas fireplace insert, you might want to consider calling a professional first to avoid potential problems like misaligning the thermocouple due to rough handling. Hiring a certified technician also makes the cleaning and inspection process smoother.

If you’re confident enough with your skills, start by reading the owner’s manual. Make sure that the gas insert is turned off and completely cooled before beginning any maintenance. Next, take a picture of the unit before disassembling it so that you have a guide when it’s time to put the parts back together.

Once all the parts have been removed, use a vacuum cleaner with a brush attachment to gently remove dust and debris from the interior. Focus on the areas around the burner and ignition components.

For cleaning the glass, use a fireplace glass cleaner and a microfiber cloth to wipe away soot and residue. Let the cleaner sit briefly for tougher stains. Use a separate cloth for polishing. This ensures a streak-free finish. A soft-bristle brush is perfect for dusting the burner, decorative media, and other interior components to remove buildup.

If you have vented gas logs, gently brush off soot with a soft-bristled brush, like a paintbrush, after removing them according to the manual. Avoid washing or damp-wiping the logs, as moisture can damage their finish. For vent-free logs, refrain from cleaning them yourself; only a qualified technician should handle maintenance to avoid safety risks.

Routine battery replacement is also important. Replace the batteries in your fireplace remotes twice a year, much like with smoke and carbon monoxide detectors, to ensure safety in emergencies.

Lastly, don’t forget to use the picture that you took at the start as a guide to piece your unit back together.

Maintenance

Inspect gas connections and seals with a flashlight to check for cracks, wear, or leaks, and consult a professional if you spot any issues. If accessible, check the venting system for obstructions or debris and ensure the vents are secure.

Additionally, look for signs of discoloration, corrosion, or damage around the insert, and contact a technician if needed. Once all cleaning and inspections are complete, reassemble the components carefully and test the insert to ensure it is working properly, observing the flames for any irregularities.

Annual professional servicing is equally important to maintain the gas insert’s safety and performance. During this inspection, a qualified technician will examine key components like the gas connections, pilot assembly, and burner, addressing potential issues before they become serious problems. By combining regular cleaning with professional servicing, you can ensure your gas insert operates safely and efficiently throughout its lifespan.

Cleaning and Maintenance: It’s a Tie!

Both gas fireplaces and gas inserts require regular maintenance to ensure safe and efficient operation. This includes cleaning the glass, burner, and decorative components, as well as scheduling annual professional inspections to check for gas leaks, venting issues, or wear and tear.

While gas fireplaces may have more components to inspect (especially with complex designs like see-through or outdoor models), gas inserts can require additional attention to ensure their venting and closed combustion systems remain effective. Both options require similar levels of care to maintain safety and performance.

Sustainability

Gas Fireplaces

Gas fireplaces burn cleaner than wood fireplaces, producing fewer particulates, carbon monoxide, and other emissions. However, they still release some nitrogen oxides and carbon dioxide, which contribute to air pollution and greenhouse gas emissions. While they are a cleaner option compared to wood-burning fireplaces, they are not entirely emission-free like electric fireplaces.

Despite this, gas fireplaces offer efficient and sustainable operations in several ways. They provide fast heating, capable of quickly warming large spaces and open floor plans thanks to the high heat energy produced by propane or natural gas fuels. They also create a cozy ambiance, enhancing the comfort of a room and making it an inviting space for hosting guests, relaxing, or spending time with loved ones. Additionally, gas fireplaces serve as a focal piece in gatherings, acting as a centerpiece that draws people together and contributes to a warm and welcoming environment during social events.

Gas Inserts

Gas inserts offer significant environmental benefits compared to traditional wood fireplaces, mainly because they produce lower emissions and burn more cleanly. Unlike wood-burning units that release a lot of smoke and harmful pollutants, gas inserts operate more efficiently, which means they create less pollution. This cleaner burning not only improves local air quality, benefiting everyone’s health, but also meets strict environmental regulations aimed at reducing pollution and protecting nature.

Additionally, many of these inserts can use renewable gas sources like biogas or synthetic natural gas. These renewable fuels come from organic materials and waste, making them sustainable choices for heating. By using renewable gas, homeowners can reduce their dependence on fossil fuels, which contribute to climate change. This switch helps lower the environmental impact associated with traditional energy sources and supports a circular economy, where waste is transformed into valuable energy.

Sustainability: It’s a Tie!

Both gas fireplaces and gas inserts require regular maintenance to ensure safe and efficient operation. This includes cleaning the glass, burner, and decorative components, as well as scheduling annual professional inspections to check for gas leaks, venting issues, or wear and tear.

While gas fireplaces may have more components to inspect (especially with complex designs like see-through or outdoor models), gas inserts can require additional attention to ensure their venting and closed combustion systems remain effective. Both options require similar levels of care to maintain safety and performance.

Key Factors to Consider Before Buying

Space and Location

Choose a fireplace that fits the size of your room. Larger rooms need more heat output (higher BTUs), while smaller spaces need less. Think about where you’ll place it—on an inside or outside wall—as this affects venting options. Direct vent fireplaces send gases outside and are good for sealed spaces, while vent-free fireplaces are easier to install but need good airflow in the room.

Purpose

Decide if the fireplace will be your main heat source or just add extra warmth. For main heating, pick a high-efficiency model with enough power to heat the entire room. For supplemental heating, a smaller unit works well. Some fireplaces also let you focus heat in specific areas, saving energy.

Aesthetic Preferences

Pick a style that matches your home’s design. Modern linear fireplaces have a sleek look with glass media or LED lighting, while traditional inserts look like classic wood fireplaces with realistic logs and brick-style interiors. You can also customize features like flame colors, media, and decorative fronts to suit your taste.

Budget

Think about the full cost, not just the price of the fireplace. Installation costs, like venting and labor, can add up, especially for direct vent models. Vent-free units are cheaper to install. Fuel type matters too—natural gas is usually cheaper than propane. Don’t forget ongoing maintenance, like cleaning and inspections, to keep the fireplace safe and efficient.

FAQs

What’s the difference between a gas fireplace and a gas insert?

Gas fireplaces are built-in or standalone units that can be installed anywhere in a home, whether or not there is an existing fireplace. Gas inserts, on the other hand, are made to fit inside old wood-burning fireplaces, turning them into efficient gas-powered systems without needing a complete remodel.

Which is more efficient: gas fireplaces or inserts?

Both gas fireplaces and inserts are efficient, but ventless models are the most efficient because they keep all the heat inside the room. Gas inserts are usually sealed and lose very little heat, while some gas fireplaces with vents might lose a bit of warmth through their venting system.

Do I need a chimney for either option?

You don’t need a chimney for ventless models, as they don’t release gases outside. However, vented models, like direct vent fireplaces or inserts, require a vent that can go through a wall or roof, but this doesn’t have to be a traditional chimney.

Which is better for heating large spaces?

Gas fireplaces are better for heating large areas since they produce more heat, with some models reaching up to 70,000 BTUs. Gas inserts are better for smaller or medium spaces, as they generally produce between 8,500 and 40,000 BTUs, which is enough for supplemental heating.

Which option is more cost-effective?

If you already have a fireplace, gas inserts are more cost-effective because they fit into the existing structure and don’t need major modifications. Gas fireplaces can be more expensive to install because they often require additional venting or structural changes, but they offer more flexibility in terms of design and placement.

Do both need professional installation?

Yes, both gas fireplaces and gas inserts should be installed by a professional. This ensures the unit is safe, properly vented, and meets local building codes. Gas fireplaces usually need more work for venting systems, while gas inserts are simpler because they use the existing fireplace structure.

How often do they need maintenance?

Both gas fireplaces and gas inserts need yearly professional inspections to make sure they are working safely. Regular cleaning of the glass and burner is also necessary to keep the unit running efficiently and looking good.

Are ventless models safe?

Ventless models are safe as long as they are installed in rooms with good ventilation. They include safety features like oxygen depletion sensors, but they release combustion byproducts into the room, which is why they aren’t allowed in some areas due to air quality concerns.

Can I customize the look?

Yes, both gas fireplaces and gas inserts allow for customization. Gas fireplaces come in a wider range of styles, including modern linear designs, see-through models, and outdoor options. Gas inserts are limited by the size of the existing fireplace opening but still offer choices for decorative logs, glass media, and finish options.

Are they environmentally friendly?

Both are more environmentally friendly than wood-burning fireplaces because they burn cleaner and produce fewer pollutants. Some models can even use renewable gas, like biogas, to further reduce their environmental impact, making them a greener choice for home heating.

The Verdict

The choice between gas inserts and gas fireplaces depends on your needs, budget, and home setup. Gas fireplaces are great if you want more style options, higher heat output, or a primary heat source. They work well in new builds or when making big home changes. Gas inserts are a smart and budget-friendly option for updating old wood-burning fireplaces, providing good heat and easy installation.

Both options are cleaner and easier to use than wood-burning fireplaces, adding warmth and a cozy feel to your home. Think about the size of your space, how much heat you need, and the style you like to decide which one is right for you. Either way, both can make your home more comfortable and welcoming.

Popular Models

Gas Fireplaces

Empire Comfort Systems

Pictured: Empire Rushmore 40" TruFlame Clean Face, Natural Gas Direct Vent Fireplace

Empire Comfort Systems offers durable and stylish gas fireplaces with options like direct vent, vent-free, and B-vent models. Their fireplaces are designed for efficiency and come with customizable features, making them a good fit for both modern and traditional homes.

Majestic Fireplaces

Pictured: Majestic Courtyard 36" Traditional Outdoor Vent Free Natural Gas Fireplace With Traditional Stacked Concrete Refractory and IntelliFire Ignition System

Majestic Fireplaces combines classic and modern styles with advanced features like smart controls and heat distribution systems. Their fireplaces range from sleek linear designs to traditional models, offering high efficiency and reliable performance.

Napoleon

Pictured: Napoleon 45" Elevation X Series 42 Direct Vent Gas Fireplace

Napoleon is known for innovative gas fireplaces with features like adjustable flames, heat management systems, and efficient burners. Their models include linear, see-through, and traditional styles, making them a popular choice for homeowners and designers.

Gas Inserts

Monessen

Pictured: Monessen 36" Lo-Rider LCUF Clean Face Vent Free Gas Firebox with Interior Panels

Monessen gas inserts are designed to easily fit into existing fireplaces, providing realistic flames and efficient heating. They offer options like vent-free or direct vent and come with customizable media and finishes, making them a practical and stylish upgrade. Some models are offered as firebox-only, providing the flexibility to customize the interior with your choice of log sets, burners, and other design elements.

Superior Fireplaces

Pictured: Superior DRI2032 32" Traditional Direct Vent Natural Gas Fireplace Insert

Superior gas inserts offer efficient heating and modern designs for older fireplaces. With vent-free and direct vent options, they are easy to install and include features like remote controls and adjustable flames for added convenience.

Real Fyre

Pictured: Real Fyre 25" mSeries Direct Vent Gas Inserts (Millivolt) Traditional Style

Real Fyre is known for manufacturing realistic gas logs. Their gas inserts are ideal for converting wood-burning fireplaces into efficient heating units. They combine advanced burners with beautifully crafted log sets for a natural look and reliable warmth.

Where To Buy?

When buying a gas fireplace or insert, check out local stores where you can see the product and ask questions, or shop online for more options and better prices. Read customer reviews to find trusted retailers and contractors. Ask friends, family, or neighbors for recommendations. Make sure the installer you choose is certified and knows local rules to ensure safe and proper installation.

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