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Fireplace repair costs around $600 on average, but simple repairs can total as low as $100, while more complex repairs could reach up to $2,500 or more. The specific repair will be the most significant factor. Here are some common fireplace repairs below, along with the average pricing of each:

• Firebox repair: $160–$2,500

• Gas valve repair: $150–$300

• Hearth repair: $150–$800

• Igniter repair: $100–$150

• Mantel repair: $500–$1,200

• Pilot light repair: $100–$350

• Refractory panel repair: $200–$300

• Thermocouple repair: $75–$350

• Thermopile repair: $75–$350

Yes, if your gas fireplace has a flue, you typically need to open it when using the fireplace. Although gas fireplaces don’t produce the type of smoke and soot that wood-burning ones do, they still release combustion gasses like carbon monoxide. Opening the flue ensures these gasses safely exit your home through the chimney. Not all gas fireplaces need a chimney, however. Always check the manufacturer’s instructions for your specific gas fireplace model, as some newer models may have different ventilation requirements.

The best wood for a fireplace includes hardwoods, such as ash, birch, cherry, maple, and oak. These woods ignite quickly and put out the most heat. They also produce less smoke than other types of wood. Softwoods, such as eucalyptus, poplar, and willow, are poor choices for burning in a fireplace because they create a lot of smoke and have a high moisture content that makes it challenging to light.

Like other kinds of masonry and brickwork, a properly installed chimney should have a lifespan that extends beyond multiple generations of homeowners. But there are parts of the chimney that will need to be replaced more frequently. 

• Clay tile or cast-in-place liners should be replaced every 50 years.

• Stainless steel liners will last an average of 15–20 years.

• Mortar will require replacement every 25–30 years.

• Chimney crowns have an average lifespan of 50–75 years.