Do You Need to Line Your Chimney for a Wood Burning Stove in Devon?
As wood burning stoves continue to be an increasingly popular way to heat homes in Devon, one question comes up again and again:
“Do I need to line my chimney when converting an open fire to a wood burning stove?”
The short answer is:
Not always legally required — but in most cases, lining your chimney is strongly recommended for safety, stove performance, and long-term chimney health.
Many homeowners are told by friends or online forums that “you don’t need a liner.” While this can sometimes be technically true, it depends entirely on the condition and suitability of your chimney.
When Is a Chimney Liner Not Required?
Under UK Building Regulations, you may not need to install a chimney liner if all of the following apply:
- Your existing chimney is proven to be structurally sound
- The chimney diameter is suitable for the stove being installed
- The stove can be connected safely and compliantly
- The flue draws correctly within the stove manufacturer’s requirements
- The chimney can be properly swept and maintained
- All relevant Building Regulations are fully met
If your chimney satisfies every one of these conditions, a liner may not be legally necessary.
However, this is where many homeowners get caught out.
Why Most Wood Burning Stoves Perform Better With a Chimney Liner
Wood burning stoves are designed to work with a flue size close to the manufacturer’s specification.
For example:
A stove designed for a 6-inch flue will rarely perform well when connected to an old masonry chimney with an internal diameter of 10–11 inches.
A correctly installed chimney liner helps by:
- Improving stove draw
- Keeping flue gases hotter for longer
- Reducing tar and creosote build-up
- Improving fuel efficiency
- Making lighting and refuelling easier
- Reducing smoke spillage into the room
In simple terms:
A properly lined chimney helps your stove burn cleaner, safer, and more efficiently.
What Happens If You Don’t Line Your Chimney?
Choosing not to fit a chimney liner can create several serious issues.
1. Carbon Monoxide and Smoke Leaks
If your chimney has cracks, gaps, or hidden defects, smoke and carbon monoxide can leak into:
- Your home
- Roof voids
- Adjacent properties (including next door)
Carbon monoxide is colourless, odourless, and potentially fatal.
This is one of the biggest safety reasons chimney liners are recommended.
2. Poor Stove Performance and Smoke Problems
Smoke rises because it is hot.
Large, cold, unlined chimneys cool smoke rapidly, especially when:
- Chimney walls are rough
- The flue is oversized
- There are voids stealing heat
As smoke cools, it slows down and deposits:
- Tar
- Creosote
- Condensation
This can lead to:
- Poor stove draw
- Difficult lighting
- Smoke spilling when doors are opened
- Smells and staining
- Damp issues inside the chimney
3. Increased Risk of Chimney Fires
Unlined chimneys are more likely to suffer chimney fires because tar and creosote deposits build up faster.
A properly installed stainless steel liner:
- Reduces tar accumulation
- Improves sweeping access
- Helps contain chimney fires should one occur
Why Open Fires Often “Worked Fine” Without a Liner
A common question is:
“I’ve had an open fire in this chimney for years with no problems — why does a stove need a liner?”
The reason is simple.
Open fires are highly inefficient.
Typically:
- 70% or more of the heat from an open fire goes straight up the chimney
This creates a very hot, fast-moving column of air that helps carry smoke out before it cools.
Modern wood burning stoves are far more efficient.
Typically:
- 75%+ of heat stays in the room
- 25% or less goes up the flue
This is great for heating your home, but it means flue gases are cooler and need more help staying hot enough to rise effectively.
That is why stove installations often benefit from:
- Chimney liners
- Insulated liners
- Correct flue sizing
Should You Install a Stove Without a Chimney Liner?
Technically, sometimes yes.
Practically, often no.
While every property is different, most older Devon homes benefit significantly from fitting a chimney liner when converting an open fire to a wood burner.
The decision should always be based on:
- Chimney condition
- Flue size
- Stove type
- Intended fuel
- Installation design
Need Advice Before Installing a Wood Burner in Devon?
At ProSweep, we do not install stoves — we specialise in chimney sweeping and chimney safety inspections.
That means we have no financial incentive to sell you a liner or push an installation.
Our only priority is ensuring the chimneys we sweep are safe, compliant, and working correctly.
If you’re considering installing a wood burning stove in Devon and want honest advice about whether your chimney should be lined, get in touch with ProSweep before making a decision.