Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Denton Owner’s Guide

A Gelco flue liner replacement in Denton typically runs $2,800-$4,200 installed for a standard single-flue chimney, with most jobs completed in one day. We stock Gelco-compatible stainless steel liner sections and connection kits through our Haven buying network, and we carry the common diameters from 5 to 8 inches on every service truck. Most Denton homeowners discover the problem during a sweep when the camera finds gaps, corrosion scaling, or separation at the collar joint where the liner meets the appliance adapter.

Call (940) 373-6912

Which Gelco Models This Applies To

Gelco manufactured flue liners under several series names over the years, and the part you need depends on when your system was installed. The Gelco UltraPro and Gelco Pro series are the two most common in Denton homes built between 1995 and 2015, identifiable by the stamped model tag on the top termination cap or the collar band just above the fireplace damper. The UltraPro used .006-inch 316Ti stainless for oil and gas; the Pro series ran .005-inch 304 stainless, which corrodes faster in Texas flues that see mixed wood and gas firing.

We don’t need the original paperwork. Our techs measure the flue diameter at the thimble, check the appliance BTU rating, and match the collar type - slip-fit, clamp-lock, or gasket-seal - to spec the right replacement section. OEM Gelco parts are available but often carry a 3-week lead time; we source equivalent 316Ti stainless through Olympia Chimney and DuraFlex with identical gauge and warranty terms, usually at lower landed cost. Emberly Chimney Cleaners Denton is an independent service provider, not affiliated with Gelco.

Signs Your Gelco Flue Liner Replacement Is Failing

• White or orange powder on the liner walls. This is oxidation scaling, and on Gelco 304 stainless it starts at the waterline where condensation pools. In Denton’s clay-heavy soils, foundation shift can tilt the liner just enough to trap moisture at the low side.
• Smoke smell in upper rooms when the fireplace is cold. A separated collar joint or cracked liner section lets downdraft carry combustion gases into the chase. The camera finds it at the transition where Gelco’s clamp-lock collars were hand-tightened instead of torqued.
• Chunks of clay tile in the firebox. If your chimney was relined with a Gelco insert but the original clay wasn’t fully removed, spalling tile can puncture the stainless from the outside. We see this in Denton’s pre-1980 ranch homes near Scripture Street and the neighborhoods north of UNT.
• Discolored or warped metal at the chimney top. The Gelco termination cap is supposed to keep rain out and let exhaust spiral. When the cap corrodes or blows off, Texas wind drives water directly down the flue.
• Your sweep flagged “liner integrity compromised” without showing you where. This is the symptom we hear about most. Ask for the timestamp on the camera footage. If they can’t produce it, call us for a second opinion - free, with Clause 4 documentation included.

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Replacement Cost & What’s Included

The installed price for a Gelco-compatible flue liner replacement in Denton breaks down as follows:

What drives the range: flue height, diameter, whether the existing liner pulls out clean or fragments inside the chase, and if the smoke chamber needs parging to meet clearance. We deliver a written scope, written price, and written warranty before any work starts - Haven Standard Clause 1. The 365-Day Done Right Promise covers the installation. Materials are sourced through our Haven buying network from Gelco, Olympia Chimney, DuraFlex, and HeatShield specifically to keep customer prices honest.

DIY or Call Us?

There’s a safe middle ground here, and then there’s the point where it stops being safe. You can verify the model tag location, measure your flue diameter with a tape, and check the termination cap for visible corrosion - all useful information that speeds up our quote. What you cannot safely do is drop a liner down a two-story chimney without proper rigging, torque the collar joints to spec, or pressure-test the completed assembly for draft and leakage.

The camera doesn’t guess - and neither do I. Corrine Halstead and our crews have replaced Gelco liners in Denton homes where the homeowner started the job, got the old liner stuck at the smoke chamber shoulder, and called us to finish. That costs more than calling first. If you want to know what you’re dealing with, we’ll run the camera, show you the footage, and write the price before you decide. Call (940) 373-6912.

FAQs