September 16, 2025

Carbon Monoxide & Log Burners: Everything You Need to Know

Few things beat the warmth and atmosphere of a real log burner. As the evenings draw in, lighting the fire becomes part of the routine for many households across the UK.

Like any heating appliance, however, a log burner needs to be installed, maintained and used correctly. One of the most important reasons for this is carbon monoxide (CO).

The good news is that carbon monoxide poisoning is largely preventable. With the right installation, regular maintenance and a working carbon monoxide alarm, you can enjoy your stove with confidence.

What is carbon monoxide?

Carbon monoxide (CO) is a colourless, odourless and tasteless gas produced whenever fuels such as wood, coal, gas or oil burn.

Normally, a properly installed and well-maintained stove allows these gases to leave your home safely through the flue.

Problems arise when combustion is incomplete or the gases cannot escape as intended.

Because carbon monoxide cannot be detected by human senses, every home with a solid fuel appliance should have a suitable carbon monoxide alarm.

Can log burners produce carbon monoxide?

Yes.
Like any appliance that burns fuel, a log burner can produce carbon monoxide if combustion is incomplete.

A correctly installed and properly maintained stove safely removes combustion gases through the chimney or flue. Carbon monoxide only becomes dangerous when those gases are prevented from escaping and begin to build up inside the home.

What causes carbon monoxide to build up?

There are several common causes.

A blocked chimney or flue

Soot, creosote and even bird nests can restrict the flue, preventing combustion gases from leaving the property efficiently.

Burning unsuitable fuel

Wet or unseasoned logs burn less efficiently, producing more smoke and increasing creosote deposits within the flue.

Poor maintenance

Worn door seals, damaged components or neglected servicing can affect the stove's performance and airflow.

Incorrect installation

An incorrectly installed appliance or flue system may not provide the ventilation required for safe operation.

Five simple ways to stay safe

Fortunately, reducing the risk is straightforward.

1. Install a carbon monoxide alarm

Every room containing a solid fuel appliance should have a carbon monoxide alarm installed in accordance with the manufacturer's guidance.

Test the alarm regularly and replace it when recommended.

2. Have your chimney swept regularly

Regular chimney sweeping removes soot, creosote and other obstructions, helping your stove operate safely and efficiently.

For most households, this should form part of your annual maintenance routine before the heating season begins.

3. Burn the right fuel

Always use properly seasoned or kiln-dried logs with a moisture content below 20%.

Dry wood burns hotter, produces fewer emissions and helps reduce creosote build-up.

4. Keep your stove maintained

Inspect door seals, glass and air controls regularly, and arrange professional servicing whenever recommended by the manufacturer.

5. Never block ventilation

Your stove requires a supply of fresh air to burn efficiently.

Never cover or block permanent air vents that have been installed for your appliance.

Recognising the symptoms of carbon monoxide poisoning

Early symptoms can include:

Headaches
Dizziness
Nausea
Fatigue
Confusion

These symptoms are often mistaken for flu because they develop gradually.

If several members of the household begin feeling unwell at the same time—or symptoms improve when you leave the property—carbon monoxide could be the cause.

If you suspect carbon monoxide:

Open doors and windows.
Extinguish the fire if it is safe to do so.
Leave the property.
Seek medical advice immediately.
Do not use the appliance again until it has been inspected.

Enjoy your stove with confidence

A log burner should provide warmth, comfort and enjoyment—not cause concern.

With a correctly installed appliance, regular chimney sweeping, suitable fuel and a working carbon monoxide alarm, the risks associated with carbon monoxide are significantly reduced.

A few simple checks each year will help keep your stove operating safely, efficiently and reliably throughout the heating season.

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