Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Paterson Owner’s Guide

We stock and install Gelco-compatible flue liner replacements throughout Paterson, with most stainless steel liner swaps running $1,800 to $3,400 installed depending on flue height, liner diameter, and access. Most Gelco liner replacements in Paterson are completed in a single visit because our trucks carry common 6-inch and 8-inch stainless liner kits plus the fittings. The typical call starts like this: a homeowner notices flaking metal inside the fireplace, or a home inspector flags the liner after the previous owner ignored it for years. In older Paterson housing stock, especially row houses near the Great Falls Historic District, a corroded Gelco liner is one of the more common findings on a Level 2 camera scan.

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Key Takeaways

• Gelco flue liner replacement in Paterson runs roughly $1,800-$3,400 installed for standard stainless steel liners.
• The liner is not a cosmetic part. A perforated liner leaks heat and combustion gases into the chimney chase or nearby framing.
• Every replacement includes a camera scan before and after, plus a written scope and photo record.
• We are an independent service provider, not affiliated with Gelco. We match their liner specs and use quality aftermarket equivalents where the original is no longer produced.

Which Gelco Models This Applies To

Gelco liners are manufactured in standard diameter increments: 5.5-inch, 6-inch, 7-inch, and 8-inch are the sizes we see most often in Paterson homes, with 6-inch and 8-inch being the most common by a wide margin. The compatibility issue that trips up most homeowners is this: a liner sized for a wood-burning fireplace is not automatically safe to reuse for a gas insert. Gas flue gasses run cooler and wetter, and a liner rated only for solid fuel will corrode faster when it sees continuous gas exhaust. If you are switching fuel type while replacing the liner, tell us before we quote.

How to identify your liner size: look for a metal tag riveted to the top of the liner at the chimney crown, or measure the inside diameter of the existing liner where visible at the top of the firebox. Most Gelco liners also carry a stamped part number beginning with a two-letter series code. If the tag is gone, we measure on site before quoting anything. For OEM versus aftermarket: Gelco still makes liners, but many of the older series numbers are discontinued. We match the discontinued series to a current equivalent from DuraFlex or HeatShield with the same diameter, wall thickness, and fuel rating. The liner itself is commodity stainless steel. What matters is the installation: proper insulation wrap, the right top plate, and a drip-free connection at the appliance collar.

Signs Your Gelco Flue Liner Replacement Is Failing

• Rust flakes or metal fragments inside the fireplace or cleanout. This means the inner wall of the liner is spalling, or shedding. The liner has usually been seeing moisture for years. Once the inner wall can flake, the liner is no longer a protective boundary.
• A sulfur or “burnt metal” smell near the chimney, even when the fireplace is cold. Combustion byproducts are leaking into the chase and finding their way into the room. That smell means gases are not fully contained.
• Visible gaps, buckling, or a seam that has opened on the liner surface. Liners expand and contract with every fire. Over ten or fifteen Paterson winters, that thermal cycling can split a seam, especially on liners that were never insulated.
• Water staining on the ceiling, wall, or the exterior chimney chase near the flue. A failed liner lets acidic condensate eat through the masonry from the inside. By the time you see water, the mortar joints have usually been softening for a while.
• Excess creosote buildup in a short period, or a chimney sweep who hesitates to certify the fireplace. A degraded liner surface holds more creosote, and no responsible sweep will sign off on a liner with visible perforation. If your sweep flagged it, take the photo record seriously.

Before

After

Replacement Cost & What’s Included

In Paterson, a standard Gelco liner replacement runs $1,800 to $3,400 installed. On the low end, that is a straight 6-inch liner in a single-story chimney with good access. On the high end, that is an 8-inch liner, a two-story run, an insulated wrap, and a new top plate and cap. The liner itself is typically $400 to $700 of the total. The rest is labor, insulation, fittings, and the time to pull the old liner without damaging the crown.

Every quote includes a written scope: liner size, insulation, fittings, the removal method, and the labor. The warranty on our liner work is five years on materials and installation under the Haven Standard. You also get the before and after camera footage, which is the only way to know the old liner is fully out and the new one is seated correctly. Clause 4 of the Haven Standard requires that photo record on every job, no exceptions. Corrine Halstead and the Paterson crew have been running a camera down flues for going on eighteen years, and the footage always tells the truth faster than a description does.

DIY or Call Us?

You can safely check a few things yourself: look inside the firebox with a flashlight, note any flaking or gaps, and check the cleanout for rust debris. What you should not do is attempt the liner replacement yourself. A flue liner is the primary barrier between combustion gases and your home. If it is not sealed correctly at the appliance collar and the top plate, you can have carbon monoxide moving into wall cavities or living space without any visible sign. The work also means working at height, either from a roof or staging, while handling stainless steel that has sharp edges. This is not a weekend project. If you want to yank the damper plate and look up the flue, fine. If you want the liner swapped, call (862) 356-5229 and we will give you a written price before anything starts.

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