Gas Fireplace Flame Too Low? Reason and Solutions

Key Points:

  • Gas fireplace’s low flame is caused for several reasons including low gas pressure, obstructed vents, low airflow, and faulty burners.
  • Fixing the fireplace’s flame isn’t difficult. You should check all vents and pipes to ensure airflow and change defective parts.

A gas fireplace is a very important element in your house, especially in the colder days. But you should be concerned if the fireplace flame is too low which indicates some issues within the internal mechanism.

A fireplace may omit low flames due to the gas line connectivity problems. It may also happen if residue builds up in the line or if the gas pressure is weak. These problems are responsible for insufficient gas which leads to low flames.

The article is concerned about the gas fireplace burner low flame problem. It provides other relevant information that helps you how to detect and solve them.

So, without further ado let’s start with the article!

Reasons Why Gas Fireplace Flame Is Too Low

If you’re facing the gas fireplace low flame problem, it should give you a headache in big terms. If the flame is too low, the fireplace generates less heat which is exactly opposite to what you want from the fireplace. In order to deal with the problem, you need to know all the reasons why your gas fireplace has a low or uneven flame.

Low Gas Pressure

One of the prime reasons for the low flame is inadequate incoming or outgoing gas pressure. In most cases, the outgoing gas pressure becomes low which causes a low or uneven flame of the gas fireplace.

The gas valve is the culprit here. If the pipe is faulty or if there’s an obstruction, you need to either clean the valve or replace it with a new one.

Obstructed Vents

If the fireplace is vented and if there’s an obstruction that is connected to the outside, the gas fireplace doesn’t get enough air. This results in weak combustion and low flames.

Clogged Burner

Your fireplace burners may get clogged due to the dirt and debris that build up in the burners. They reduce the gas flow which generates low flames.

Air Shutter

Air shutter also affects the flow of air that causes low or uneven flames. Usually, the closer the air shutter is placed, the less air it allows to flow.

So, these are the common reasons why you have to deal with gas fireplace burner low flame problems. Once you know the reasons, you should start fixing them as well.

How to Get a Bigger Flame in a Gas Fireplace?

Well, fixing the low flame of the gas fireplace isn’t a hard task to do. You need to follow a few simple steps to get a bigger flame in a gas fireplace. The steps are as follows:

Measure the Gas Pressure

Use a manometer to test whether the gas pressure in the vent is enough or not. Run the burners of the fireplace slightly before testing the air pressure. If you’re using natural gas, the optimum gas pressure should be within 5 to 7 WC.

You have to position and reposition the gas pipe until the gas pressure comes to this point. If the value doesn’t change for a while, you need to look for other possible solutions.

Open Air Vent

The position of the air vents largely affects the flame quality. If the vent is closed or nearly closed, only an insignificant amount of air enters the fireplace to generate low flames.

If you open the door of the air vent, it will allow more airflow within the fireplace. However, don’t open the air vent too much as it may result in generating red and larger fire which may cause danger.

You also should open the air shutter as it also helps more airflow to come inside the fireplace.

Check the Burner

The burner may also have defects that may cause the flame to be significantly low. That’s why you need to check if there’s any debris on the burner. If the burner is clogged with dirt, it also will generate a low flame. Clean the burner so that high gas can flow.

Again, the burner may have cracks that prevent sufficient gas flow. If your burner is cracked, you need to replace it with a new one.

Replace the Valve Motor

If the valve motor of the fireplace is defective, there’s a high chance of getting an odd-sized flame. This is because it determines how much gas will pass through.

To deal with the valve motor, I recommend calling for an expert and replacing it if needed.

So, that was all how to solve a gas fireplace low flame problem. Also, you need to clean your gas fireplace properly to get rid of the problem.

Frequently Asked Questions (FAQs):

How to increase flame on gas fireplace?

You need to make sure the fireplace is getting enough gas and air to provide large and even flame. You should turn the gas knob to the right to increase gas pressure, open the air vent, and adjust the air shutter.

What happens if the gas fireplace flame is too high?

If the flame of the gas fireplace is too high, it troubles you in some ways just the way you’re disturbed with a low flame of the fireplace. The fireplace turns so hot that it may cause an explosion in extreme conditions.
That’s why it is important to set the flame to an optimum height. The ideal flame height is 3.5 inches. You can see the ideal height reading or pressure reading as instructed in the manual.

What does it mean when a gas fireplace flame is blue?

Some people complain about their gas fireplace blue flame always on. However, it is an indication of complete combustion. The flame becomes blue when there’s no wastage and it burns fluently.


Flame is the prime part of a gas fireplace as it keeps you hot which is why it is made for. So, if the flame is faulty, there’s no reason to keep it, right?

This article tried to discuss the probable reasons for a gas fireplace burner low flame problem and their solutions. You shouldn’t have any problem fixing any of the problems.

I hope you will be able to generate a healthy flame from now out of your gas fireplace. Thank you.

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