How much does it cost to run a gas fireplace?
How much does it cost to run a gas fireplace?
$1.20 – $6.30 average cost per day (3 – 6 hours of use)
$40 – $190 average cost per month
$120 – $760 average cost per winter season
Average cost to run a gas fireplace
The average cost to run a gas fireplace is $1.20 to $6.30 per day, or $40 to $190 per month when running the fireplace 3 to 6 hours a day. The cost of running a gas fireplace depends on the fuel type, home location, and the fireplace size, type, and efficiency.
| Time period | Estimated running cost (natural gas-fueled fireplace) |
Estimated running cost (propane gas-fueled fireplace) |
|---|---|---|
| Hourly | $0.40 – $0.50 per hour | $0.50 – $1.05 per hour |
| Daily (3 – 6 hours) | $1.20 – $3.00 | $1.50 – $6.30 |
| Monthly (30 days) | $40 – $90 | $50 – $190 |
| Seasonal (3 – 4 months) | $120 – $360 | $150 – $760 |
*Based on a 30,000-Btu gas fireplace and the current U.S. average propane and natural gas prices.
In comparison, the average cost to run a space heater is $2 to $3 per day or $60 to $90 per month.
What affects the cost of running a gas fireplace?
Several key elements contribute to the overall cost of operating a gas fireplace:
Room size & ceiling height: Larger spaces or those with high or vaulted ceilings require more heat, meaning higher fuel consumption and operating costs.
Home construction: Well-insulated homes retain heat better, reducing the workload on the fireplace and lowering fuel costs.
Fireplace age & efficiency: Older fireplaces may be less efficient, consuming more fuel. Investing in a newer, energy-efficient model can reduce long-term operating costs.
Local gas prices: The cost of natural gas or propane varies by location and market conditions, directly affecting the cost to run your fireplace.
Climate: The geographical location and climate significantly impact usage patterns and needs. Colder climates may require more frequent and prolonged use, increasing annual costs.
Purpose: Using the fireplace as a primary heat source will result in higher costs compared to occasional use for ambiance.
Pilot off vs. pilot on: Leaving the pilot light on continuously often adds $10 to $20+ per month to your gas bill as the pilot light alone consumes about 600 to 1,500 Btu per hour. Some people choose to leave it on during the colder months when they are using the fireplace regularly.
Maintenance: Regular maintenance is essential for a gas fireplace to run safely and efficiently. Spending $75 to $125 for an annual inspection and cleaning adds to the overall expense of running the fireplace, but it may save you money in the long run. Most gas fireplace repairs cost between $200 and $1,000.
Vented vs. ventless
The design of your gas fireplace affects its efficiency, and therefore its operating costs. Vented units cost more to run as they lose a significant amount of the heat they generate. Ventless models operate at almost 100% efficiency, but they carry potential air quality and health risks associated with the exhaust.
| Feature | Vented | Ventless |
|---|---|---|
| Operating cost | Higher cost due to heat loss | Lower operating cost due to minimal heat loss |
| Venting system | Chimney or vent pipe to expel gases outside | No external venting required |
| Heat efficiency | 70% to 80% efficient with some heat escaping through the vent | Up to 99% of heat stays in the room |
| Safety | Safer for indoor air quality | Illegal in some areas due to exhaust safety concerns |
IMPORTANT: While ventless fireplaces are more efficient and cost-effective to operate, consider local regulations and safety implications before choosing this option.
Heat output
Btu, or British thermal unit, measures the heat output of your gas fireplace. The higher the Btu rating, the more heat your fireplace produces—and the more fuel it consumes. Most residential gas fireplaces range from 20,000 to 60,000 Btus.
| Approximate room size | Fireplace Btu range | Average hourly cost* |
|---|---|---|
| Small (up to 400 square feet) | 20,000 – 30,000 | $0.28 – $0.56 |
| Medium (400 – 1,000 square feet) | 30,000 – 40,000 | $0.42 – $0.93 |
| Large (1,000 – 2,000 square feet) | 40,000 – 60,000 | $0.70 – $1.12 |
*Based on natural gas price range of $1.20 to $1.60 per therm.
Propane vs. gas
The choice between propane and natural gas may affect your operating costs. Natural gas is generally cheaper than propane but requires a connection to the municipal gas line. Propane requires an on-site storage tank and is more costly but ideal for rural areas that don't have access to piped natural gas.
While fuel costs vary by location, the table below reflects the current national average pricing for propane and natural gas.
| Type | Average cost | Details |
|---|---|---|
| Natural gas | $1.20 – $1.60 per therm* | Requires connection to a municipal gas line |
| Propane | $1.50 – $3.50 per gallon* | Often used in remote areas without natural gas lines |
*1 therm = 100,000 British thermal units (Btus), while 1 gallon of propane = nearly 100,000 Btus.
Calculating the cost to run a gas fireplace
To estimate the cost to run a gas fireplace per hour:
Determine your fireplace's Btu rating. This should be in the user's manual and may be listed directly on the fireplace itself.
Find your local gas price (per therm for natural gas or per gallon for propane).
Multiply the fireplace's Btu rating by the cost per therm (for natural gas) or the cost per gallon (for propane) for your area.
Then, divide the result by 100,000 to get your cost per hour.
Formula: (Btu rating × fuel cost per therm) ÷ 100,000 = operating cost per hour
FAQs about running a gas fireplace
How does a gas fireplace work?
Gas fireplaces use natural gas or propane to generate heat and flames. When activated, gas flows to the burner, where it's ignited by the pilot light or ignition system, producing flames that heat ceramic logs or glass beads, which radiate warmth into the room.
Vented units expel combustion gases outside, while ventless units release them into the living space.
Many models have controls to adjust the flame and heat.
Is it cheaper to run a gas or electric fireplace?
In most cases, a gas fireplace is cheaper to run than an electric one. While electric fireplaces have a lower hourly operating cost, they typically produce less heat, potentially leading to longer run times and higher overall expenses. However, the exact cost difference depends on local utility rates and the efficiency of the specific fireplace models.
Can a gas fireplace heat a house?
A gas fireplace can offer significant heat but is not designed to heat an entire house efficiently. Gas fireplaces are best suited for zone heating, warming the room they're installed in, and possibly adjacent areas. A central heating system is typically more efficient and effective for whole-house heating.
Can you run a gas fireplace all day?
Most modern, fully vented gas fireplaces are designed for extended use and can be run all day if needed. However, a more cost-effective and energy-efficient heating method is to use them in conjunction with your home's primary heating system, focusing on heating the rooms you're actively using.
Ventless gas fireplaces should only run for a maximum of 2 to 3 hours at a time and no more than 6 hours total per day. Additionally, you should have a carbon monoxide detector with an audible alarm in the same room.
Always adhere to the manufacturer's guidelines for your specific model.
Choosing a gas fireplace
Selecting the right gas fireplace for your home involves considering several factors to ensure it meets your heating needs, aesthetic preferences, and budget. Consult with a certified gas fireplace installer near you or HVAC professional who can assess your space, recommend appropriate models, and ensure proper installation.
Here are some things to keep in mind when making your choice:
Determine your primary goal:
Supplemental heat: Choose a higher Btu output for significant heating.
Ambiance: Lower Btu models may suffice if warmth is secondary to appearance.
Balanced approach: Mid-range Btu fireplaces offer both heat and visual appeal.
Vented vs. ventless:
Vented: Ideal for traditional aesthetics and homes with existing chimneys.
Ventless: More efficient but may have air quality concerns; check local regulations.
Direct vent: A good compromise, offering efficiency and safety without requiring a chimney.
Style & design:
Traditional: Log sets and classic mantels offer a conventional look.
Contemporary: Linear fireplaces or minimalist designs work well for modern interiors.
See-through: Dual-sided fireplaces heat and enhance two rooms simultaneously.
Features & controls:
Thermostat: Allows precise temperature control.
Remote control: Offers convenience for adjusting settings.
Added blower: Helps distribute heat more effectively throughout the room.
Modulating valve: Adjusts flame height and heat output for efficiency.
Installation requirements:
Existing fireplace: Consider an insert for easy retrofitting. A standard gas fireplace insert costs $3,000 to $5,000 to install, while a gas log insert costs $300 to $2,000.
New installation: Factor in costs for venting and any necessary construction. If you don't already have one, installing a gas line costs $12 to $25 per linear foot, or $360 to $740 total on average.
Energy efficiency
Look for models with high Annual Fuel Utilization Efficiency (AFUE) ratings.
Consider features like direct spark ignition instead of standing pilot lights for better efficiency.
Budget considerations
Initial costs: Include the unit, installation, and any necessary home modifications.
Operating costs: Factor in fuel prices and estimated usage.
Long-term savings: More efficient models may cost more upfront but save money over time.
Using our proprietary cost database, in-depth research, and collaboration with industry experts, we deliver accurate, up-to-date pricing and insights you can trust, every time.