Twin-Wall Flue Systems vs Flexible Chimney Liners: UK Parts & Kit Cost Guide
Sale prices for twin-wall parts and flexible liners. Twin-wall: Median £63 (IQR £58, from £10 to £195, n=284, 13 outliers removed). Liners: Median £28 (IQR £11, from £12 to £89, n=6, 2 outliers removed).
Twin-wall insulated flue
- Median
- £63.50
- IQR
- £58
- Lower quartile
- £39.99
- Upper quartile
- £97.99
Twin-wall parts in this catalogue are insulated flue components: lengths, adapters, tees and supports sold with a was/now price.
Median £63 (IQR £58, from £10 to £195, n=284, 13 outliers removed).
These are component prices, not a finished system. A full external run needs several lengths plus supports, a terminal and flashings. Add those part prices rather than treating one length as the job.
Flexible chimney liners
- Median
- £28.49
- IQR
- £11.28
- Lower quartile
- £22.50
- Upper quartile
- £33.78
Flexible liners are the stainless kits and lengths used inside an existing chimney.
Median £28 (IQR £11, from £12 to £89, n=6, 2 outliers removed).
A liner price and a twin-wall price are not substitutes. One suits an existing chimney; the other is the usual route where there is no usable chimney. A registered installer should confirm which one applies.
How to compare the two
Compare like for like: diameter (often 125mm or 150mm), length, and whether the price includes VAT.
A stove-and-liner bundle is listed with the stove when the product is a stove. The liner-only lines stay in stove supplies.