Midtherm
Midtherm is a leading UK manufacturer of high-quality chimney and flue systems, known for their innovative designs and durable products.
They specialise in twin wall and flexible flue liners as well as a wide range of chimney and flue components in stainless steel and black finishes. Midtherm offers products in all diameters and lengths, ensuring solutions for every installation need.
Their components are designed for exceptional performance and reliability in both domestic and commercial applications. With a reputation for excellence, Midtherm continues to be a trusted name in the flue and chimney industry.

Showing 1–21 of 88 results
- Made in the UK
- Matt black finish
- 5" and 6" diameters
- Made in the UK
- Stainless steel chrome finish
- 5" and 6" diameters
- Durable build
- Matt black premium finish
- 5" and 6" diameters
- Push-fit stainless design
- 5" or 6" diameter
- Withstands up to 450°C
- 5″ or 6″ diameters
- Stainless steel chrome finish
- Push fit connection (Comes with 1 band)
- Durable steel construction
- 5" or 6" diameters
- 1000mm straight flue length
- Ideal for gas fires/ stoves
- Premium quality gas liner
- 316 grade stainless steel
- Suitable for wood burning stoves
- 5″ diameter flex
- Various lengths available
- Suitable for wood burning and multi fuel stoves
- 5″ diameter flex
- Various lengths available
- Ideal for gas fires/ stoves
- Premium quality gas liner
- 316 grade stainless steel
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 5" (125mm) diameter
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 5" (125mm) diameter
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 5" (125mm) diameter
- 5" or 6" diameters
- Matt black finish
- Push fit connection (Comes with 1 band)
- Push-fit stainless design
- 5" or 6" diameters
- Withstands up to 450°C
- 5" or 6" diameters
- Stainless steel chrome finish
- Push fit connection (Comes with 1 band)
- Suitable for wood burning stoves
- 6″ diameter flex
- Various lengths available
- Suitable for wood burning and multi fuel stoves
- 6″ diameter flex
- Various lengths available
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 6" (150mm) diameter
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 6" (150mm) diameter
- High quality durable construction
- 316 Stainless steel (EN 1.4401)
- 6" (150mm) diameter
Showing 1–21 of 88 results
You've viewed 21 of 88 products
Bonfire has been proudly supplying Midtherm components to customers across the UK for over 20 years.
We offer an extensive range of Midtherm twin wall and flexible flue liners, as well as their full selection of chimney and flue components.
Available in stainless steel and black finishes, and in all diameters and lengths, our inventory is designed to meet every requirement. We are committed to providing reliable, high-quality products that ensure safe and efficient installations.
As a trusted distributor, we work closely with Midtherm to maintain a seamless supply chain and competitive pricing. Our dedication to customer satisfaction has made us a go-to supplier for both public and trade clients.
Whether you’re fitting a domestic wood-burning stove or designing a complex commercial flue system, we have the expertise to help. We also offer expert advice, fast delivery, and outstanding after-sales support.
Bonfire takes pride in supporting the UK’s heating and chimney industries with the best products and service available.















