To get more yellow flame in a gas fireplace, you need to slightly restrict the oxygen mixing with the gas. This is safely achieved by adjusting the air shutter or aeration rod beneath or behind the burner, or by carefully repositioning the logs.
A yellow or orange gas flame is a sign of incomplete combustion, meaning the gas is not mixing with enough oxygen to burn cleanly. While a healthy flame is mostly blue, a yellow flame indicates inefficiency and can produce dangerous carbon monoxide.
A healthy, properly burning flame on gas appliances should be blue in color, sometimes with a tiny tip of yellow, with a little light blue triangle at the center. This blue color flame indicates that there is safe, efficient and more complete fuel combustion.
To make the flame on your gas fireplace bigger, adjust the main gas control knob (located behind the lower access panel) to its highest setting. For fireplaces with a wall key or remote, turn the key counterclockwise or use the remote's flame-height button to maximize the gas flow.
Incomplete Combustion: A yellow or orange flame indicates incomplete combustion, meaning the gas isn't burning as it should. Soot Production: These flames can produce soot, which can accumulate in your appliance and chimney, leading to blockages and potential fire hazards.
Quite simply, to make the flame in your gas fireplace or fire pit yellow, reduce the amount of air mixed with the gas.
Pure carbon monoxide burns with a vivid, translucent light blue flame. However, if you see a yellow, orange, or red flame on a standard gas appliance (like a stove or furnace), it does not mean you are seeing the carbon monoxide itself. Instead, these colors indicate incomplete combustion, meaning the appliance is likely producing and releasing dangerous carbon monoxide alongside soot.
To maximize the heat from your gas fireplace, ensure the flame height is set to maximum and check that your gas logs are properly arranged to allow air to flow. For a significant boost, install a blower fan, use the central HVAC fan to circulate the heat, or consider upgrading to a modern, enclosed gas insert.
Myth #1 - Gas Fireplaces Are Always More Expensive Than Central Heating. The Truth: Gas fireplaces can be more economical than conventional forced air heating systems, mainly because they can be used for zone heating. You can heat only those areas of the house you need, not the whole house.
A low gas fireplace flame is usually caused by an incorrect remote or valve setting, obstructed burner ports from soot or debris, or a blocked gas orifice. Check that your gas shut-off valves are fully open, replace the remote batteries, and look for clogs.
A yellow gas flame indicates starved air and incomplete combustion, often due to clogged burner ports or an improper air-to-gas mixture. An orange flame, however, is frequently just caused by dust, airborne particles, or household humidity burning in the flame rather than a poor gas mixture.
Here are the five key signs that your gas fireplace needs expert attention to keep your home safe and warm.
A healthy gas flame should burn bright blue. This indicates complete combustion, meaning the gas is burning efficiently and safely. A slight trace of yellow at the very tips can sometimes be normal, but the core should always remain distinctively blue.
Fire is yellow because microscopic particles of unburned carbon (soot) within the flame are heated to extreme temperatures, causing them to glow. This process is known as incandescence, where the intense heat radiates a yellow light.
Too little air, and you'll get a low yellow flame. If the flame looks like it's floating above the burner, there is too much air coming through. The correct amount of air should give you consistent, approximately 1-inch blue flames with a yellow tip across the entire burner, and the flames should touch the burner.
It costs an average of $0.30 to $0.70 per hour to run a natural gas fireplace, and $1.00 to $2.30 per hour for propane. The exact price depends on your local utility rates, the size of your fireplace, and the type of gas it uses.
Introducing wood into a gas fireplace can cause several issues: Safety Risks: Burning wood in a gas fireplace creates excessive heat and soot that the system wasn't designed to handle. This can damage the fireplace components and potentially cause a fire hazard.
Sleeping in the same room as an open flued gas appliance (back boiler or gas fire) contravenes the gas safety regulations and puts your life in danger. If you are found to be sleeping in the same room as an open flued appliance during one of our visits, your gas heating appliance will be capped off for safety reasons.
So, if you use your gas appliance for 2 hours a day. The total running cost of it would be: 30.36p (cost per hour) x 2 hours (number of hours in use) = 60.72p for 2 hours.
This holds true unless the fireplace is a ventless one which does not require an open damper. To adjust the color of the flames so there is a soft yellow tip at the top of the flames, the gas adjustment should be left alone and the air input reduced by partially closing the air shutter located at the end of the burner.
For a Hotter Fire
Fully open the damper to maximize airflow. It provides ample oxygen to the fire, resulting in a more intense and hotter burn. The damper must be fully open when lighting the fire.
It is also a good idea to know the signs of a potential CO problem:
The term "silent killer gas" almost universally refers to Carbon Monoxide (CO). It is a colorless, odorless, and tasteless gas produced by the incomplete burning of fossil fuels (like wood, coal, propane, and gasoline). It is deadly because it replaces oxygen in your bloodstream, preventing vital organs from functioning.
A crisp, roaring blue flame is the gold standard when it comes to your furnace's performance. If your furnace is producing a completely blue flame, it indicates proper combustion and that the process is well-balanced and efficient.