Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Ellicott City Owner’s Guide

We stock Gelco-compatible flue liner replacement parts on our trucks and install them throughout Ellicott City for $2,200 to $4,800, depending on flue height, liner diameter, and access. Most Gelco liner replacements are completed in a single day once we’ve measured your existing flue and confirmed the diameter. The typical call starts the same way: a homeowner notices flaking metal at the cleanout, a rust line on the chimney exterior, or their sweep flags the liner during an annual inspection. A Gelco flue liner usually fails from the inside out, and by the time you see it, the liner walls have already thinned enough to matter.

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Which Gelco Models This Applies To

Gelco’s flue liner line spans a few distinct series, and matching the replacement to what’s already in the chimney matters more than most people expect. We work with Gelco’s 316L and 316Ti alloy liners, which cover the bulk of installations in Howard County homes built or relined between 1990 and 2015. The common sizes we replace are 5.5-inch, 6-inch, and 8-inch diameters, with 6-inch being the workhorse for oil and gas appliances in Ellicott City. To identify your liner, check the manufacturer’s tag at the appliance connection point, or measure the interior diameter at the cleanout door. The model number is often stamped near the top termination cap, though Maryland weather has a habit of wearing those stamps smooth. If you’re not sure what you have, one camera scan tells us the diameter, the alloy, and the condition in about twenty minutes.

One thing we hear often: homeowners assume any stainless liner will do. That’s not the case with Gelco. Their 316Ti alloy was designed specifically for higher-temperature oil exhaust and performs differently than the 304-grade liners other manufacturers sell as an economy option. If you’re burning oil, the 316Ti liner is worth the difference. If you’ve converted to gas, a standard 316L replacement usually does the job. We also stock equivalent liners from DuraFlex and HeatShield, so if the Gelco lead time runs long or the model has been discontinued, we can match the spec without making you wait.

Signs Your Gelco Flue Liner Replacement Is Failing

• Flaking metal at the cleanout door or in the firebox. Stainless liners don’t rust the way steel does, but the alloy can spall when the protective oxide layer breaks down. Flakes that look like aluminum foil are the most common early sign we see in Ellicott City chimneys.
• A rust streak on the exterior masonry or ceiling near the flue. This usually means condensation is forming inside the liner and wicking through joints or cracks. Maryland’s humid summers make this worse, especially on exterior chimneys that stay damp for weeks at a time.
• Exhaust odor in the home, particularly right after startup. When a Gelco liner develops a seam separation or pinhole, flue gases exit before they reach the cap. The smell is often subtle at first, then more noticeable on cold mornings when the chimney draft is slow to establish.
• Visible gaps or separation at connection points, often spotted during an inspection. The liner sections lock together, but years of thermal cycling can loosen those joints. We see this frequently on the older stone-foundation homes near Historic Ellicott City, where slight foundation movement transfers stress into the flue.
• A failed draft test during a Level 2 camera inspection. The camera doesn’t soften what it finds, and neither do we: if the liner has collapsed internally, thinned to below 0.005 inch, or pulled apart at a seam, the photos make it obvious. That’s the finding that turns a cleaning into a replacement conversation.

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Replacement Cost & What’s Included

In Ellicott City, a Gelco flue liner replacement runs $2,200 to $4,800 installed. The spread comes down to three things: the total flue height, the liner diameter, and whether we need to remove an old liner first. A single-story home with a 6-inch liner and clean access usually lands near the low end. A two-story chimney with an 8-inch liner, a deteriorated clay tile liner that needs breaking out, and a rooftop termination cap replacement pushes toward the high end. Here’s what that price includes:

• Written scope and price before any work starts. Clause 1 of the Haven Standard: we put it in writing, every time. You won’t get a verbal estimate that changes when the truck arrives.
• Removal and disposal of the failed Gelco liner. We haul it away. No extra charge.
• New Gelco liner (or equivalent DuraFlex/HeatShield if your model is discontinued), sized to your flue. We order exactly the diameter and alloy your appliance requires, not whatever’s on sale.
• Termination cap, top plate, and rain collar as needed. The liner is only as good as the cap that keeps Maryland rain out of it.
• Camera-scan documentation before and after installation. Since 2009, every job leaves with a photo record. Clause 4 of the Haven Standard wasn’t our idea of an upsell; it’s the proof you can see with your own eyes.
• Written warranty on the liner and the workmanship. If it’s not done right, we make it right. That’s the 365-Day Done Right Promise, on paper.

If you bring us a competitor’s written quote, we’ll give you a free second opinion. We’re not the cheapest outfit in Ellicott City, and we don’t try to be. We’re the one that shows you the camera footage before asking for a dollar.

DIY or Call Us?

There’s a version of this job you can safely do yourself, and a version you absolutely should not. You can check your cleanout door, look for flaking metal, and note any rust streaks on the masonry. You can snap photos and read the tag on the liner if it’s still legible. That’s information we’ll use when you call.

What you shouldn’t do is drop a liner down a flue without the right tools and training. A flue liner replacement involves working at height, handling a stainless roll that wants to spring back open, and connecting sections inside a masonry chase where visibility is zero without a camera. Screw that connection up and you’ve created a carbon monoxide path inside your house. Corrine Halstead has worked Howard County chimneys for the better part of a decade, trained at New York City College of Technology, and still sends a camera down every flue before quoting a number. This is not a Saturday-afternoon project. Call (443) 363-5262 and let us put eyes on it first.

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