Unsure if you need a chimney liner for your wood burner? HETAS-approved installer Wes Dodd explains when a flue liner is required for safe, efficient stove installations in Poole, Bournemouth & Dorset.
By Wes Dodd — WD Wood Burner Installations, Poole, Bournemouth & Dorset
One of the most frequent questions I get asked when installing stoves across Poole, Bournemouth and Dorset is:
“Do I need a chimney liner for my wood burner, or can I use the existing chimney?”
In many cases, the answer is yes — a liner is strongly recommended, and in some situations it is legally required. Here’s a simple, expert guide to help you understand why.
What is a Chimney Liner?
A chimney liner (or flue liner) is a continuous stainless-steel tube installed inside your existing chimney. Its purpose is to safely channel smoke and gases out of your home.
When You MUST Have a Chimney Liner
You will need a liner if:
- Your existing chimney is damaged, cracked or leaking
- The chimney is too large for a modern, efficient stove
- Your chimney is in an older property (e.g. Victorian terraces in Poole or Parkstone)
- The chimney fails a smoke pressure test
- The stove manufacturer requires a liner for warranty and safety
As a HETAS installer, I will inspect your chimney and advise during the site survey.
Why Installing a Liner is Recommended Even if Not Mandatory
Even if your chimney could work without a liner, there are big benefits to fitting one:
✅ Improved Safety
Prevents gases such as carbon monoxide leaking into rooms or loft spaces.
✅ Better Performance & Heat Output
A properly sized liner improves draw, giving a hotter, cleaner, more efficient burn.
✅ Cleaner Chimney & Less Soot
Unlined chimneys often cause tar and creosote buildup, raising fire risk.
✅ Protects Your Property
Moisture and acidic gases from wood smoke can rot brickwork or stain walls if not lined.
Lined vs Unlined – Performance Comparison
| Factor | Lined Chimney | Unlined Chimney |
|---|---|---|
| Smoke extraction | Strong, consistent draw | Variable, can backdraft |
| Heat efficiency | Higher, burns wood more cleanly | Lower efficiency |
| Safety | Reduces leak and fire risks | Higher risk of gas leakage |
| Maintenance | Less soot build-up | More sweeping required |
| Legal/insurance | Meets regulations | May cause compliance issues |
FAQ About Chimney Liners
Do all wood burners legally require a liner?
No — but most modern installations do in order to meet manufacturer and safety requirements.
How long does a liner last?
Typically 10–20 years if swept and maintained properly.
Can I install a liner myself?
No — liners must be installed and signed off by a competent person such as a HETAS-registered installer.
Will my insurance be affected without one?
Yes — many insurers expect proof of compliant installation for fire-related claims.
Final Thoughts from Wes
Fitting a flue liner is not just about regulation — it’s about safety, performance, and protecting your home. In most installations I complete across Poole, Bournemouth, Christchurch, Wimborne, Swanage, Wareham and Dorset, a chimney liner is either required or strongly advised.
👉 For HETAS-approved surveys, installation and chimney advice, contact WD Wood Burner Installations today.
