Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Austin Owner’s Guide

A Gelco flue liner replacement in Austin typically runs $2,200 to $4,600 installed, depending on liner diameter, length, and how much of the old liner has deteriorated. We stock Gelco-compatible stainless steel liners on the truck and can usually complete the swap in a single visit. Most homeowners discover the problem during a chimney sweep when the camera scope shows rust-through, separated seams, or a liner that’s started to collapse inward.

Call (361) 603-5116

If you’re here, odds are someone already put a camera up your flue and showed you something you didn’t want to see. Or you found rust flakes in the firebox and started asking questions. Either way, you’re in the right place. This page covers what a Gelco liner actually is, why it fails, what replacement costs in the Austin market, and what to expect from the swap itself. We’ll also tell you plainly when you can hold off and when you shouldn’t.

Which Gelco Models This Applies To

Gelco manufactures flexible stainless steel chimney liners in diameters from 4 inches up to 12 inches, with the 6-inch and 8-inch sizes being the most common in Austin homes. The liner’s UL listing is stamped along the outer wall every few feet, so if a section is still accessible, you can read the diameter and alloy grade directly off the metal. We look for the 316Ti or 316L designation. That alloy matters. The Ti and L variants resist the acidic condensate that forms when a gas appliance vents through a chimney, and Austin’s humidity accelerates that corrosion cycle in liners that were originally built to a lower spec.

If the stamp is gone or the liner has crumbled too far to read, we measure the ID and match from there. One compatibility gotcha we see regularly: older Gelco liners were often installed with a tee snout at the bottom that doesn’t align with modern appliance connectors. When that happens, a straight liner-to-appliance adapter swap solves the mismatch without re-running the whole liner. On the OEM-versus-aftermarket question for Gelco specifically: Gelco’s factory liners are solid, but quality aftermarket 316Ti equivalents from Olympia or DuraFlex meet the same UL 1777 standard and typically save $300 to $600 on materials. We’ll quote both and tell you the difference before you commit.

Signs Your Gelco Flue Liner Replacement Is Failing

• Rust flakes or metallic grit in the firebox. This is the big one. When the inner wall of a stainless liner starts to oxidize, small flakes break loose and land where you can see them. If you see rust-colored debris that wasn’t there last season, the liner is actively shedding material.
• A sour, acrid smell when lighting the fire. That odor is acidic condensate and creosote trapped between a failing liner wall and the original masonry flue. It means combustion byproducts are no longer making a clean exit.
• Visible discoloration or warping at the liner’s lower section. The bottom 18 to 24 inches of the liner take the worst beating. That’s where heat, moisture, and acidic runoff concentrate. If the tee or connector looks brownish, blistered, or misshapen, the liner above is usually worse.
• Water staining on the ceiling or wall near the chimney chase. A liner that’s compromised lets warm, moist exhaust gas into the chase cavity. Over time, that moisture condenses on framing and shows up as stains inside the house.
• You can see daylight or a tear when shining a flashlight up the flue. Easy check. Open the damper, aim a light up, and look. If you see pinholes of light coming through the liner wall, or a visible split at a seam, it’s done.

Replacement Cost & What’s Included

In Austin, an installed Gelco-compatible flue liner replacement runs $2,200 to $4,600. The range comes down to three things: liner diameter (6-inch costs less than 8-inch, and going from an unlined or partially lined flue to a full liner adds cost), total height from appliance to chimney crown (longer runs need more liner sections and more time), and access difficulty (two-story houses with steep roof pitches cost more than single-story runs).

Here’s what that price includes when Hadley Chimney Austin does the work: the liner kit sized to your flue, the tee and connector at the appliance end, the top plate and rain cap at the crown, removal and disposal of the old liner, and a camera re-inspection after installation so you can see the new liner from top to bottom. Every replacement carries a 365-Day Done Right Promise: if it’s not done right, we make it right, backed by a written guarantee on every repair and a free second visit if the repair fails. You get the written price before we touch anything, and the invoice comes to your phone as a digital link.

Typical Gelco Liner Replacement Costs in Austin

• 6-inch liner, single-story, 15 to 20 foot run: $2,200 to $2,800
• 6-inch liner, two-story or steep access: $2,800 to $3,400
• 8-inch liner, single-story: $2,800 to $3,600
• 8-inch liner, two-story or steep access: $3,400 to $4,200
• 12-inch liner or custom flue sizing: $3,800 to $4,600

These are installed prices, not parts-only. We don’t quote a liner without looking at the flue first, because the flue’s condition determines whether you need just a liner or also a top plate repair, crown work, or a masonry patch where the old liner was supported.

DIY or Call Us?

There are two honest answers here. First answer: you can safely check for the visible signs above, and you should. Pull the damper open, shine a light up, look at the firebox for rust flakes. That’s free and useful. Second answer: replacing a flue liner is not a weekend project. You’re working at height on a roof, you’re pulling a corrugated stainless tube through a masonry chase that may have offsets and rough spots, and if you get the tee connection wrong at the appliance, you’ve created a carbon monoxide pathway into the house. A botched liner job is worse than the old liner. For anyone who isn’t a trained chimney professional, we recommend calling us at (361) 603-5116 and getting a camera-documented quote instead.

Cory Mitchell’s rule on this one is simple. “I’ll show you the photo first. Then we’ll talk.” We scope the flue, show you exactly what the liner looks like on camera, and give you the written price. If the liner can safely wait, we’ll say so. If it can’t, at least you’re deciding with your own eyes on the evidence.

FAQs

Get Your Gelco Liner Scoped and Quoted

If your Gelco flue liner is showing any of the signs above, or someone already told you it needs replacement, call Hadley Chimney Austin at (361) 603-5116. We’ll schedule a camera inspection, show you exactly what the liner looks like, and give you a written price before any work starts. Every replacement carries our 365-Day Done Right Promise, a written guarantee, and before-and-after photo documentation. Calls are answered by a live person 24/7, and the tech who shows up will be background-checked, uniformed, and tracking to your door in real time.

Written by Cory Mitchell, Owner, Hadley Chimney Austin at Hadley Chimney Austin, serving Austin and nearby areas.