Can Your Fireplace Get TOO HOT?

When temperatures plummet in New England, there’s nothing like a warm fire to take the chill off. But can your fireplace get too hot? Yes. This is called over-firing, and it can damage your fireplace or even cause a chimney fire. Here are the causes and signs of over-firing, along with how to prevent it.

Causes of over-firing:

1. Too much fuel: You don’t need to fill every square inch of your firebox with wood. Most standard fireplaces accommodate 2 to 3 logs measuring 3 to 6 inches in diameter and 16 to 18 inches in length. Once you have a good fire going, add one log at a time to maintain steady heat. 

   
   

2. Too much oxygen:  While oxygen is essential for a strong, efficient fire, too much air can cause it to burn too quickly, reducing heat output and increasing wear on your fireplace and chimney. 

   NOTE: Air-pumping bellows should only be used with a stagnant fire.

3. Burning the wrong materials: Use only seasoned hardwood (oak, maple, ash, or birch) with a 15-20% moisture content, as it burns more predictably and at a safer temperature.

>Related Reading: 8 Things You Should Never Burn in Your Fireplace

Signs that your fireplace is too hot:

Recognizing the signs of over-firing can help prevent damage and keep your home and family safe:

• Loud roaring sounds similar to a blowtorch or a freight train

• Flaking, cracked, or broken firebricks

• Strong metallic burning odors

• Glowing red dampers, grates, or doors

• Warping or deformed metal parts

• Sparks or embers shooting up the flue

Preventing over-firing:

• Only burn seasoned hardwood.

• Follow the manufacturer's guidelines regarding airflow settings and the recommended size and amount of wood.

• Install a heat shield or hood to direct heat away from TVs or mantels.

• Use a hearth thermometer to ensure the area surrounding your fireplace remains below 150°F. (For specific temperature recommendations, read the manufacturer’s guidelines.

A Note About Fireplace & Chimney Maintenance: To ensure your fireplace and chimney function safely and efficiently, schedule an annual cleaning and inspection with our CSIA-certified team.

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