Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Houston Owner’s Guide

We stock and install Gelco-compatible flue liner replacements across Houston, with most installed jobs running between $1,800 and $3,400 depending on flue height and access. A full flue liner swap on a single-story home typically takes one day, and we carry the common Gelco sizes on the truck so we’re not sending you back to a supply house. Most Houston homeowners discover they need a liner replacement the way you probably just did: an inspection photo shows cracks or spalling in the clay tiles, or a Gelco stainless liner has corroded through at the seams after years of Gulf Coast humidity working on it.

Call (903) 961-6496

If your chimney sweep or inspector handed you a camera photo with an arrow pointing at a crack, you’re in the right place. We’ll walk through what that photo actually means, what a replacement costs, and what your options are before anyone touches a tool.

Key takeaways:

• Gelco liner replacement in Houston runs $1,800 – $3,400 installed, with the liner itself accounting for roughly half that cost.
• Most single-story replacements take one day; two-story flues with roof access issues may run into a second morning.
• We stock common Gelco 316L stainless liner sizes (5.5″, 6″, and 7″ diameters) and can source odd sizes within a few days.
• Every quote is written before work starts, and the repair carries our 365-Day Done Right Promise in writing.

Which Gelco Models This Applies To

Gelco has made a few different liner lines over the years, and the replacement path depends on which one you have. The most common in Houston homes is the Gelco 316L flexible stainless liner, usually paired with a clay tile flue that cracked or shifted. If you have the older Gelco aluminized steel liner, that’s typically a gas-only application, and it corrodes faster in our humidity. Gelco also made a smooth-wall rigid liner for straight flues, which is easier to measure but harder to work through offset chimneys.

Identifying what you have matters. Look at the top of your chimney or the appliance connector at the bottom: 316L stainless carries a dull silver finish, aluminized steel is lighter with a slightly mottled look. And here’s the gotcha most people miss: Gelco liners are sized by inside diameter, not outside. A liner marked “6 inch” has a 6-inch interior bore, which means the outside dimension is larger and may not fit through your existing clay tiles without removal of the old liner first. We measure the actual flue bore before we quote anything, because guessing wrong means a liner that won’t seat and a second trip to fix it.

We install genuine Gelco liners when the spec calls for it, and we also stock DuraFlex and HeatShield equivalents that meet the same UL 1777 standard. For most Houston fireplaces, a quality aftermarket 316L liner does the same job as the Gelco original at roughly 15-20% less for the part. We’ll show you the price difference in the written quote and let you decide.

Signs Your Gelco Flue Liner Replacement Is Failing

• Rust flakes or metallic debris at the base of the flue. Water from Houston storms gets in, sits on the liner, and starts eating through the steel. This is the earliest sign and the cheapest to fix before it spreads.
• Visible corrosion or pinholes on the liner surface. A camera inspection will show this clearly. Pinholes are where carbon monoxide starts leaking into the chimney cavity instead of venting out the top.
• A sudden drop in draft or a smoky fireplace. When liner segments separate or collapse, the flue can’t pull properly. You’ll notice smoke backing up into the room on a windy day.
• White or gray staining on the exterior chimney brick. Condensation is escaping through a breached liner and leaching through the masonry. In Houston’s humidity, this is a year-round problem, not just a winter one.
• Gas appliance odor you can’t place. If the liner serving your furnace or water heater is compromised, combustion gases aren’t venting fully. This one is an immediate call, not a “watch it for a while” situation.

Replacement Cost & What’s Included

You’re seeing numbers now, not later. A Gelco flue liner replacement in Houston runs $1,800 to $3,400 installed, and the spread comes down to three things: flue height, whether the old liner needs to be cut out first, and access to the crown (single-story is simpler than a steep two-story roof we can’t safely stand on without staging). The liner material itself is $40 – $60 per foot for 316L stainless, so a 25-foot flue accounts for $1,000 – $1,500 in material before labor.

Every quote includes the full scope in writing: what we replace, what we inspect, and what the guarantee covers. If a covered repair fails inside the guarantee period, we return at no charge. That’s the 365-Day Done Right Promise, and it’s not an add-on or a line item. It’s how we’ve worked since 2002.

DIY or Call Us?

Here’s the honest split. You can safely check the easy stuff: look for rust at the base of the flue, check the chimney cap for missing sections, and if you have a straight flue with a flashlight and a mirror, you might see obvious damage. What you should not do is pull a liner out or try to route a new one down from the roof. Liners are heavy, they get stuck in offset flues, and working on a Houston roof in the summer without safety gear is how people end up in an emergency room.

Installing a liner means sizing it to the UL 1777 standard, connecting it to the right appliance adapter, and sealing the top and bottom correctly so condensation doesn’t sit on the liner and start the corrosion cycle all over again. If it’s wrong, you don’t find out until the carbon monoxide detector goes off or the chimney fails inspection. That’s not a gamble worth taking. Nathan Corliss and the Ashby Chimney Houston crew do this work weekly. Call (903) 961-6496 and we’ll give you a written price before anything moves.

How Long Does a Gelco Flue Liner Last in Houston?

In Houston’s climate, expect 12 to 20 years from a 316L stainless liner. The humidity and the salt air that drifts in from the Gulf accelerate corrosion, which is why we replace more liners here than you’d see in a drier market like Dallas or Austin.

Can My Gelco Liner Be Repaired Instead of Replaced?

Small pinholes can sometimes be patched if the surrounding steel is solid. But patching is a temporary fix, and we’ll tell you that plainly. If the liner has separated at the seams or shows corrosion across more than about 10% of its surface, replacement is the honest fix. We’ll show you the camera footage and let you decide.

How Long Does the Replacement Take?

A single-story Gelco liner replacement takes one working day, start to finish. Two-story flues with an old liner that needs to be cut out run into a second morning. We give you a real arrival window before we start, and the price we quote is the price you pay.

Do You Stock Gelco Liners or Do I Need to Order One?

We stock the common Gelco sizes on the truck, including 5.5″, 6″, and 7″ 316L liners. Odd sizes and specialty lengths we can order from our supplier within a few days. You won’t be sent to a supply house to buy your own part and wait for us to install it. Tell you the price first, explain the work second, put it in writing third – that’s the whole system.

FAQs

How much does a Gelco flue liner replacement cost in Houston? Installed replacement runs $1,800 to $3,400 depending on flue height, access, and whether the old liner needs to be cut out first. Call (903) 961-6496 for a written quote specific to your chimney.

Is Ashby Chimney Houston affiliated with Gelco? We’re an independent Houston chimney company, not affiliated with Gelco. We install genuine Gelco liners and quality equivalents like DuraFlex and HeatShield, and we give you the price difference before you choose.

What actually happens if I skip the liner replacement? Breached liners leak combustion gases into the chimney cavity and, eventually, the home. In Houston’s humid air, moisture intrusion also accelerates masonry damage. The repair only gets more expensive the longer it waits. Call us at (903) 961-6496 and we’ll give you an honest assessment.

Written by Nathan Corliss, Owner, Ashby Chimney Houston at Ashby Chimney Houston, serving Houston and nearby areas.