If you’re installing a new stove or updating your existing fireplace, you’ve probably encountered the term “chimney liner.” But what exactly is it, and do you really need one?

At Northern Flame, we ensure every installation complies with UK safety standards and performs at its best. This guide will walk you through when a liner is needed, the types available, and the benefits they offer.

What Is a Chimney Liner?

A chimney liner is a protective channel inside your chimney that safely carries smoke and gases out of your home. It shields the chimney structure from heat and corrosion while helping your stove or fire burn more efficiently.

There are three common types:

  • Flexible stainless steel liners (most common for stove installations)

  • Rigid stainless steel liners

  • Clay or concrete liners (typically found in older builds)

When Is a Chimney Liner Required?

You must install a chimney liner if:

  • You’re fitting a new wood-burning or multi-fuel stove

  • Your existing flue is damaged, leaking, or unlined

  • You’ve changed the appliance and it’s no longer compatible with the existing flue

  • You’re lining an old chimney to meet HETAS regulations

Even if it’s not strictly required, a liner is often strongly recommended for safety, performance, and efficiency.

✅ Benefits of a Chimney Liner

1. Improved Safety
Old or damaged flues can leak carbon monoxide or allow heat transfer to surrounding structures. A liner ensures combustion gases exit safely.

2. Better Stove Performance
A properly sized liner improves draw, reduces condensation, and helps your stove burn fuel more efficiently.

3. Easier Maintenance
A smooth liner surface makes chimney sweeping quicker and more effective, reducing soot build-up and fire risk.

4. Protects the Chimney
It prevents acids and moisture from deteriorating brickwork and mortar, prolonging the life of your chimney.

5. Legal Compliance
A liner helps meet Building Regulations (Part J) and ensures your installation can be HETAS-certified.

❌ What Happens Without One?

Skipping a liner can result in:

  • Poor draft and smoke blow-back

  • Creosote build-up and fire risk

  • Heat and gas leaks into your property

  • Failed inspection and invalid insurance

️ Northern Flame’s Chimney Liner Installation

We supply and install high-grade flexible liners tailored to your stove’s output. Every job includes:

  • Full chimney inspection

  • Stainless steel liner and cowl

  • Stove connection, sealing, and testing

  • HETAS certification

Book a Survey for Your Chimney

Not sure if your chimney needs lining? Let us check it for you.
Schedule a free site survey and get expert advice with no pressure.