Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Marietta Owner’s Guide

We stock and install stainless steel flue liners that fit Gelco systems for $1,850 to $3,600 installed in Marietta, depending on liner diameter, length, and whether your existing Gelco top plate and cap can be reused. Most replacements take four to six hours, and we carry common 5.5-inch, 6-inch, and 7-inch liner sections on the truck. The way Marietta homeowners usually discover a failed Gelco liner is not dramatic. It starts with a musty smell near the fireplace, bits of flaky material in the firebox, or an inspector flagging the liner as failed during a Level 2 video inspection before a home sale.

Call (478) 796-8742

Which Gelco Models This Applies To

Gelco liners were commonly installed in prefabricated and masonry fireplaces throughout Cobb County from the 1980s through the early 2000s. The liner itself is the stainless steel tube running from your appliance or firebox up through the chimney chase. Gelco built their systems around 5.5-inch, 6-inch, and 7-inch inner diameters, and that inner diameter is the measurement that matters most for matching a replacement. You can find it stamped on the metal tag riveted to the firebox, or on a label behind the lower access panel on the fireplace face. We recommend measuring across the top of the existing liner cap opening if the tag is gone. One compatibility gotcha: some older Gelco models used a 5.5-inch liner with a flared top that does not accept a standard 6-inch replacement without a new top plate, so we always verify before ordering. For the Gelco system specifically, we usually recommend an OEM-spec liner rather than a generic aftermarket sleeve, because the top plate bolt pattern and collar height are not universal.

Signs Your Gelco Flue Liner Replacement Is Failing

• Visible rust streaks or holes on the exposed liner section. Gelco liners of a certain era used a lower-grade alloy than what we install today, and after 20-plus years of Marietta’s humid summers followed by dry winter burn seasons, pinholes form at weld seams first.
• Water or brown staining in the firebox. A cracked or separated liner joint lets rain track down inside the chase, which you’ll see as rust-colored streaks on the back wall of the firebox.
• Musty or smoke-smell in the room after a fire. When the liner wall is compromised, combustion gases can seep into the chase instead of drafting out the top, and that smell pressurizes back into the living space.
• Flakes of stainless or glazed material in the firebox. Older Gelco liners with a ceramic coating will spall over time, and those bits land right where you can see them.
• Soot buildup that returns fast after a sweep. A rough or perforated liner wall catches creosote much faster than a smooth intact liner, and a sweep that holds a year on a healthy liner will only hold a few months on a failed one.

Replacement Cost & What’s Included

In Marietta, expect $1,850 to $2,600 for a straight 6-inch Gelco-compatible liner replacement in a single-story fireplace, and $2,800 to $3,600 when the run is longer or the top plate, cap, and chase cover need replacing at the same time. The spread comes down to three things: liner diameter and length, how much of the existing Gelco hardware is reusable, and whether access requires removing sections of vinyl or brick chase. Every quote includes the liner section, top plate adapter, new cap, and labor. We give you a written price before any work starts, and the Kingswell Guarantee covers the repair for 365 days. If the liner cracks or separates inside that window, we return and correct it at no charge.

DIY or Call Us?

Homeowners can safely check the visible liner section with a flashlight, look for rust streaks in the firebox, and snap a photo of the model tag for us. That’s useful and we’re glad to walk you through it. Where DIY goes wrong is the actual replacement. A flue liner carries hot exhaust gases and creosote up through the frame of your house. A bad joint, an undersized liner, or a top plate that does not seal against the Gelco collar means carbon monoxide can find its way into the chimney chase instead of outside. That is not a repair you take a weekend on. If you’re in Marietta and the liner is showing any of the signs above, call (478) 796-8742 and we’ll put eyes on it.

FAQs