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Yes, you can install a liner in an old chimney that is in good working condition. In fact, it's often necessary for safety and efficiency. Older chimneys may lack liners or have deteriorated ones, leading to heat damage, gas leaks, or reduced performance. Installing a stainless steel, clay tile, or cast-in-place liner improves safety, protects the chimney’s structure, and boosts energy efficiency. This upgrade can extend the life span of an old chimney while meeting modern safety standards.

No, there are no ventless pellet stoves. Because pellet stoves burn wood pellets, they produce wood smoke—which contains carbon monoxide. This harmful substance needs to be vented out of your living area. That said, there are vent-free and ventless fireplaces that run on natural gas and propane. These offer the heating and ambiance of a fireplace without the need to vent thick and hazardous wood smoke.

Although no heating appliance can be entirely risk-free, a fireplace insert is considered a safer alternative to a traditional open fireplace, thanks to their enclosed design. With a sealed combustion chamber, a fireplace insert effectively reduces the risk of sparks and embers escaping into the room, minimizing the chance of an accidental fire.

Additionally, an insert comes equipped with various safety features, such as tempered glass doors that create a barrier between the flames and the surrounding space. This enhances both safety and energy efficiency by preventing heat loss. As an added bonus, many inserts are designed to meet strict safety standards that ensure proper ventilation and combustion.

Minor cleaning and maintenance are DIY-friendly, but professionals should handle structural or electrical repairs.