Do I Need a Chimney Liner for My Gas or Oil Heating System?

Many homeowners assume their furnace or boiler vents safely through their chimney — but if your chimney doesn’t have a proper liner, it could be putting your home at risk.

Let’s clear up what chimney liners do, why they’re important for gas and oil heat, and what Massachusetts code requires.

What Is a Chimney Liner?

A chimney liner is a protected, sealed passage inside your chimney that vents exhaust gases from your heating system safely out of the home.

Without one, your flue may:

  • Leak carbon monoxide into your home
  • Suffer moisture damage or brick deterioration
  • Be out of code for your heating appliance

Why Unlined Chimneys Are Dangerous

Modern gas and oil appliances are more efficient — but that means they release cooler, more acidic gases. These gases create condensation that eats away at masonry and mortar inside the chimney.

Unlined or oversized flues:

  • Cool too fast, creating acidic moisture
  • Don’t draft properly
  • Can damage the chimney from the inside out

What the Code Requires

In Massachusetts, any gas or oil appliance that vents into a chimney must have:

  • A properly sized liner
  • A material rated for the appliance type
  • Installation by a licensed and insured contractor

We install stainless steel liners built to handle oil and gas venting — sized perfectly for your specific heating appliance.

When Do You Need a New Liner?

  • Installing a new furnace, boiler, or water heater
  • Your current liner is cracked, unsealed, or deteriorating
  • Chimney moisture, staining, or carbon monoxide alarms go off
  • Town requires an inspection or compliance fix
  • Your heating tech says venting isn’t correct

What We Offer

  • Stainless steel liner installation for gas/oil systems
  • Chimney scan before and after install
  • Full permit and code compliance
  • Licensed installation (MA CSSL #106158)
  • Honest pricing and fast turnaround

Get Your Chimney Lined Right

Call 888-50-SWEEP or email [email protected]

We’ll inspect, explain, and install the right liner — guaranteed.

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What Our Clients Say About Us

Hands down the best experience we’ve had with a company doing work on our home. We found them through an internet search, looking for quotes for a complete chimney overhaul. From the first phone call to the day, they completed the work, everyone we talked to was professional, knowledgeable, and friendly! Yup, they were all nice people! We noticed a small issue after they were finished. Within 24 hours, the owner had been out to look at it and a technician was sent out to correct the problem. And they were, again, nice, and completely understanding about it. We couldn’t be happier with the result. We highly recommend ACS to everyone!

Jamie B.

We had to have a rebuild done on our chimney. They were very professional and worked hard. What a wonderful job they did! They took away all the old bricks and cleaned them up after they were done. Our chimney looks fantastic. The pricing was very affordable. Thank you, Affordable Chimney!

Peggy S.

Brandon, the Affordable Chimney Sweeps technician, inspected my chimney and found a dangerous problem that had been missed by another company’s inspector. As a result, I contracted to have Affordable replace the chimney liners and do other repairs to both the fireplace and heating exhaust systems. Their quoted price was 20% lower than the others. The estimated time for the work was 2.5 days. They came in on time and worked hard without breaks until the rain started late in the afternoon. They came back the next day and surprisingly finished in a couple of hours. They worked hard, they were courteous, and they answered all my questions. They cleaned up carefully. They earned their 5 stars.

Steve R.

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