Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Miami Owner’s Guide

Flint Chimney Co Miami stocks Gelco-compatible flue liners and installs them for a typical all-in price of $2,100 to $4,800 in Miami, depending on run length, access, and whether the old liner puts up a fight during removal. We carry Gelco 316L stainless steel replacement kits on the truck, so most swaps happen in a single visit, usually four to six hours. Owners usually find out their Gelco liner has failed one of two ways: a chimney inspection flags it on camera, or rust flakes and a sharp metallic smell start showing up in the firebox after a South Florida rainy season.

Call (786) 305-7861

Here’s the blunt version of what’s happening. Your Gelco flue liner is the stainless steel tube inside the chimney that carries smoke and combustion gases out of the house. When it fractures or corrodes through, those gases can leak into wall cavities, the attic, or back into the living space. In Miami, the failure pattern is predictable: coastal salt air, summer humidity that never quits, and long stretches where a chimney sits unused while moisture collects inside. That combination attacks the liner from the inside out. By the time you see rust staining on the exterior brick or smell something acrid near the fireplace, the liner has been compromised for a while. Camera inspection tells us exactly how much of the run is affected, and that image is yours to keep. Hank Delano built the company’s inspection standard around that principle: tell me what you saw, I’ll tell you what it costs.

Key takeaways:

• Gelco liner replacement in Miami typically runs $2,100 to $4,800 installed, with a written price before any work starts.
• We stock Gelco 316L stainless replacement liners and DuraFlex and HeatShield alternatives, so the part is on hand for most jobs.
• Every replacement carries the 365-Day Done Right Promise in writing, with a free return visit if a covered repair fails within one full year.
• Flint Chimney Co Miami is an independent service provider and not affiliated with Gelco. We work with their products because we have seen them hold up well when specified correctly.

Which Gelco Models This Applies To

This page covers replacement of Gelco stainless steel chimney liners, the flexible and rigid 316L alloy tube systems used in masonry chimney relines. The compatibility question we get most often: can I just replace part of the liner, or do I need the full run? In practical terms, Gelco liner sections are joined and sealed along the full length from appliance outlet to chimney crown. A failed section in the middle usually means the surrounding sections have been cooked by the same flue gas temperatures and moisture exposure, so partial patching is rarely worth the labor. The material cost difference between a short repair and a full replacement is small. The labor is the same either way, because the crew still has to rig the drop, work from the roof or through the firebox, and verify the seal. In Miami, where summer thunderstorms dump inches of rain in an afternoon, we replace the full run on nearly every Gelco liner job.

If you have a Gelco product tag or manual, look for the series code printed on the appliance plate near the firebox opening or on the liner’s top plate at the crown. The common residential sizes are 4″, 5″, 6″, and 8″ inner diameters, with 6″ covering most open hearths and 5″ serving gas inserts and many smaller wood stoves. If there is no documentation, we measure the existing liner during the inspection. That dimension plus the total chimney height from the appliance outlet to the crown determines the correct kit. We install OEM Gelco liners when they are available and specified, and we also carry DuraFlex and HeatShield equivalents for cases where a different wall thickness or flex option fits the flue path better. The decision is based on the job, not on margin, and we put the brand and spec in writing on the quote.

One compatibility gotcha worth knowing: Gelco liner kits are sized by inner diameter, but the outer diameter changes with wall thickness. A chimney that was originally relined with a single-wall 6″ kit may not accept a double-wall 6″ aftermarket equivalent without a clearance reduction. We check that on the initial camera pass before ordering parts, because guessing here is how you end up paying for a liner that does not fit. That is also why we never give a hard quote over the phone without seeing the chimney, though every job gets a written price before work begins.

Signs Your Gelco Flue Liner Replacement Is Failing

• Rust flakes or metallic debris in the firebox or smoke chamber. This is the most common first sign. The liner is corroding through from the condensing flue gases, and the rust is falling back down the flue. By the time you see flakes, the liner wall is thin enough in that spot that a camera will show pinholes or a full split.
• A sharp, acrid smell near the fireplace, especially on humid days. South Florida humidity works against you here. Moisture trapped in the flue pulls creosote and corrosion byproducts into the air. If the smell is strongest after a rain, the liner has likely breached and is letting water carry residue into the masonry.
• White or brown staining on the exterior chimney brick or interior wall near the chase. Flue gases leaking from a cracked liner condense and migrate through the masonry. The stain pattern tells us where the breach likely is, and the camera confirms it.
• Visible separation or sagging at the liner’s top plate on the crown. The top plate holds the liner in tension along the drop. Miami’s wet-dry cycling and occasional hurricane-force winds can loosen the plate, letting the liner shift or separate at a joint. If you can see daylight between the plate and the liner, water has been getting in.
• Reduced draft, slow-starting fires, or smoke pushing back into the room. A failing liner creates turbulence and blockages. If your fireplace used to draw well and now needs the damper open all the way just to keep smoke moving up instead of out, the interior flue path has changed. In older Coral Gables homes with original masonry, we see this a lot as liner joints open up and disrupt the draft.

Replacement Cost & What’s Included

In Miami, a full Gelco flue liner replacement lands between $2,100 and $4,800 installed, and the spread comes down to four things. The first is liner length: a single-story fireplace with a 15-foot run costs less in material than a two-story with a 35-foot drop. The second is access: a chimney with a full walkable roof and a straight flue drops faster than one that requires a lift or scaffolding off a tile roof. The third is old-liner removal: a liner that has corroded in place sometimes has to be cut and pulled in sections, which adds labor hours. The fourth is whether the crown or top plate needs attention to make the new liner seat properly, which we flag on the inspection before any money changes hands.

Parts are itemized on the line sheet. A Gelco 6″ stainless liner for a typical Miami single-story is usually in the $500 to $900 range, depending on alloy and wall thickness. The top plate, rain cap, and connector run another $150 to $400. Labor is the majority of the invoice because the crew is on the roof or in the firebox handling a 20 to 30-foot metal tube, pulling the old liner, feeding the new one, and sealing both ends. We give you the written price before work starts, and the number you approve is the number on the invoice. Every liner replacement carries the 365-Day Done Right Promise in writing: if a covered repair fails within one year, we return at no charge. That is the Garrison Standard, and it applies to every Gelco liner we install in Miami.

DIY or Call Us?

You can safely do two things. First, look for rust flakes in the firebox and check the top plate for gaps or sagging from the ground with binoculars. Second, pay attention to smells and stains on humid days. Taking those notes helps our inspection move faster. What you cannot safely do is pull a compromised liner yourself. A partial collapse or a liner that has corroded through mid-run can release flue gases into the walls, and a liner that comes apart during removal can damage the flue tiles or send debris down onto anyone below. This is not a weekend project. It is a roof-and-firebox job that requires a crew on both ends, a camera verification afterward, and a written guarantee. Call (786) 305-7861 and we will put a number in writing before anything leaves the truck. Tell us what you saw, we will tell you what it costs.

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