Gelco Flue Liner Replacement Nationwide

Gelco Flue Liner Replacement: The Newark Owner’s Guide

We stock and install Gelco-compatible flue liners in Newark, with most residential replacements running $1,800 to $3,400 installed depending on flue height, access, and whether the old liner can be pulled without scaffolding. If you call before noon, we can usually get a camera down the flue the same day and have the liner swapped within 48 hours once we confirm measurements. Most Newark homeowners discover the problem the same way: rust flakes in the firebox, a metallic smell after rain, or a sweep who pulled out a section of liner that looked like lace.

Call (862) 245-4309

The camera doesn’t negotiate, it just shows what’s there. And what it typically shows us in Newark row houses and colonials built before 1980 is a Gelco liner that outlived its factory rating but is now delaminating from the inside out. The good news is the liner itself is usually the failure point, not the chimney structure behind it.

Which Gelco Models This Applies To

Gelco liners come in two primary lines: the standard 316L stainless series for wood and gas, and the 304 series for oil-fired systems. The replacement part depends on what’s behind your fireplace. Newark homes with natural gas furnaces or boilers venting through the chimney almost always need the 316L version, while older oil-heat conversions in the Ironbound and Forest Hill still run on 304 alloy.

To identify your liner, we measure the flue diameter with a laser while the camera is down the flue. Gelco liners are stamped with their size at the top cap connection, but that stamp is often corroded or buried under soot. The real compatibility check is cross-referencing your appliance BTU rating against the flue’s internal diameter. A 6-inch liner handles most gas appliances up to about 120,000 BTU. Oil furnaces often need 7 inches. If someone quotes you a liner without measuring the flue first, get a second opinion. We’re happy to provide one against any written estimate, per our standard practice.

One Newark-specific note: many of the older clay-lined chimneys in the North Ward were built with 8×8 flue tiles. A new Gelco liner inside those flues usually drops to 6 inches, and that’s fine for gas, but it changes the draft characteristics in ways that matter for wood burning. We’ll tell you plainly what fits and what doesn’t before you spend a dime. We are an independent service provider, not affiliated with Gelco, and we’ll recommend the right liner for the job rather than the brand we have on the truck that day. We stock Gelco, DuraFlex, and HeatShield, and we’ll match the liner to your existing setup.

Signs Your Gelco Flue Liner Replacement Is Failing

• Rust flakes or metal chunks in the firebox or at the base of the chimney. This is usually the liner’s inner wall separating. The outer wall can look fine while the inside is quietly falling apart.
• A metallic, acrid smell when the furnace or water heater runs. When the liner corrodes, flue gases escape into the chimney cavity and then back into the living space. This is also a carbon monoxide concern and should be checked immediately.
• Soot stains on the chimney exterior or above the fireplace opening. Flue gas is finding a path around the liner, not through it. In Newark’s older brick chimneys, the mortar joints are often porous enough to let that gas migrate outward.
• Water in the firebox after heavy rain. The liner’s top connection is typically the first thing to fail. Once the top cap connection loosens, rain runs straight down the inside of the flue and carries rust particles with it.
• The draft feels weak or reversed. A delaminated liner creates turbulence instead of a clean pull. You’ll notice smoke backing into the room on windy days or when the furnace kicks on.

Before

After

Replacement Cost & What’s Included

For Newark, the installed price for a Gelco-compatible flue liner replacement breaks down like this:

• Single-story, straight flue, 6-inch liner: $1,800 to $2,400
• Two-story or steep-roof access, 6 or 7-inch liner: $2,400 to $3,100
• Gas furnace and water heater sharing one liner (dual appliance): $2,600 to $3,400
• Top cap, rain collar, and crown sealing included: standard on every liner job, never an add-on
• Camera inspection before and after install: included, with photos you keep

What drives the range is flue height, roof pitch, and how much of the old liner needs to be cut into sections to extract. We write the exact price on the same page as the camera images and measurements, before any work begins, under Haven Standard Clause 1. Our 365-Day Done Right Promise applies to the installation. If the liner isn’t drafting properly after we leave, we’re back to make it right, at no charge.

DIY or Call Us?

Here’s the honest split. You can safely check for rust flakes in the firebox, look for water stains around the chimney ceiling, and note whether you smell anything metallic when the heat comes on. What you shouldn’t do is pull the liner yourself. A flue liner on the second or third story of a Newark rowhouse means ladder work on a steep pitch, often with the old liner under tension or wedged against crumbling tile. That’s not a weekend project. It’s how people end up in the ER with a fall or a carbon monoxide leak they didn’t know they created.

If you want a look before you commit, call (862) 245-4309 and ask for a camera scan. We’ll show you exactly what the flue looks like on the screen, point to the seams and the corrosion line, and hand you a written price based on what the camera shows. That’s Clause 4 of the Haven Standard: a photo record on every visit, since 2009.

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