5-Inch Twin Wall Flue

5-inch twin wall flue is the most popular size on offer at StovesAreUs, so we have a variety of options to choose from here. Twin wall flue systems are designed to allow the installation of a wood burner in almost any situation and are insulated to keep flue gases warm. Explore the full collection below for free UK delivery over £100.
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Items 1 - 20 of 61

Items 1 - 20 of 61

Black Powder Coated 1m Twin Wall Flue
From £85.00
  • Dimensions: 1m length, 5" (125mm) diameter twin wall flue
  • CE & HETAS approved for domestic heating
  • Welded 316 stainless steel inner with rockwool insulation
  • 60mm clearance from combustibles
  • Easy installation with free locking band included

In Stock

HETAS Approved

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

45 Degree Bend Twin Wall Flue - Black
From £59.00
  • 45° twin wall flue bend for changing flue direction
  • 60mm safe clearance from combustibles
  • Fully welded, rockwool insulated design
  • CE and HETAS approved
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Single Storey Extension/Outhouse Flue Kit - 5" Twinwall Flue (125mm)
From £499.00
  • Complete 5" (125mm) twin wall flue kit for single-storey installations
  • Ideal for extensions, outhouses and garden rooms
  • High-density rockwool insulation with 60mm clearance to combustibles
  • Includes roof support, flashing, storm collar, rain cap and wall support
  • CE & HETAS approved with a 25-year warranty

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Round Finishing Plate - 5" Twinwall Flue (125mm)
£25.00
  • Internal dimensions: 175mm; external trim width: 75mm
  • Provides a neat finish for flues exiting at 45° or 90° angles
  • Suitable for 5" twin wall flue systems (7" external diameter)
  • Quick and easy to install with screws and silicone
  • CE and HETAS approved with 10-year warranty

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Square 45 Degree 5" Finishing Plate - Black
£29.00
  • Dimensions: 365mm (W) external, 175mm internal diameter
  • Provides a neat wall finish for 5" twin wall flues
  • Suitable for 45° or 90° flue wall penetrations
  • CE & HETAS approved for compliance
  • 10-year warranty for peace of mind after purchase

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Structural Locking Band - 5" Twinwall Flue (125mm)
From £29.00
  • Supports twin wall flue up to 2.5m height
  • Connects two twin wall flue components securely
  • Quick and easy to install
  • CE and HETAS approved for compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Powder Coated Black Wall Bracket
From £20.00
  • Adjustable from 50mm to 80mm for flexible wall support
  • Suitable for 5" twin wall flue with 125mm internal diameter
  • Made from durable 316 grade stainless steel
  • Approved for use with solid fuel, gas, and oil appliances
  • CE and Hetas certified for safety and compliance

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Anti-Wind Cowl - 5" Twinwall Flue (125mm), Matt Black
From £69.00
  • Requires only 60mm clearance from combustibles
  • Compatible with oil or solid fuel installations
  • Comes with a 10-year warranty
  • CE and HETAS approved for compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Matt Black 500mm Twin Wall Length
From £69.00
  • 0.5m twin wall flue, 316/304 stainless steel
  • Rockwool insulated (128kg/m³)
  • 60mm clearance from combustibles
  • CE & HETAS approved
  • Stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Rain Cap with Mesh - 5" Twinwall Flue (125mm)
From £59.00
  • Protects flue from rain and birds
  • Works with oil and solid fuel systems
  • 60mm clearance from combustibles
  • Includes free locking band
  • Stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

No 2 Tile Black EPDM Roof Flashing - 5" - 8" Twinwall Flue (125-200mm)
£50.00
  • Dimensions: 760mm (L) x 660mm (W) base size
  • Fits internal flue diameters from 125mm to 275mm (5"-8")
  • Suitable for roof pitches between 20-45°
  • Withstands temperatures up to 135°C
  • Durable, cuttable EPDM design for long-lasting performance

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Flat Appliance Adaptor Powder Coated Black
From £30.00
  • Suitable for wood, gas, and oil appliances
  • Needs 60mm clearance from combustibles
  • Welded and insulated with rockwool
  • CE and HETAS approved
  • 5"–5" or 4"–5" adaptor in steel or black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Roof Brace Kit - 5" Twinwall Flue (125mm), Stainless Steel
£69.00
  • Roof brace for chimneys over 1.5m
  • Adjustable arms 1.5m–2.3m
  • 60mm clearance to combustibles
  • CE & HETAS approved, 10-year warranty
  • High-density rockwool insulation

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

45 Degree Adjustable Wall Sleeve - 5" Twinwall Flue (125mm)
£35.00
  • Adjustable length from 280mm to 500mm
  • Precut to 45 degrees for easy installation
  • Designed for use inside wall cavities
  • Gap can be filled with rockwool for insulation
  • CE and HETAS approved for safety and compliance

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Roof Support - 5" Twinwall Flue (125mm), Stainless Steel
From £29.00
  • Provides lateral stability where flue exits the roof
  • Requires only 60mm clearance from combustibles
  • Quick and easy to install for roof applications
  • CE and HETAS approved for safety compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Black Single Wall to Twin Wall Increaser 4" - 5"
£25.00
  • Connects enamel flue to twinwall system
  • For solid fuel, gas, or oil use
  • 60mm clearance to combustibles
  • CE & HETAS approved, fully insulated
  • Available in stainless or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

135 Degree Long Tee & Cap 5" - Black
From £319.00
  • 565mm extension with 135° tee and removable cap
  • 60mm clearance from combustibles
  • Fully welded, rockwool insulated
  • CE & HETAS approved
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Adjustable  80mm-130mm Twin Wall Bracket - Black
From £59.00
  • Adjustable bracket fits gaps from 80mm to 130mm
  • Made from 316 grade stainless steel
  • Compatible with solid fuel, gas and oil appliances
  • Hetas and CE approved
  • Suitable for internal or external wall mounting

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Storm Collar - 5" Twinwall Flue (125mm), Steel
From £25.00
  • Prevents water ingress around roof flashing for weatherproof seal
  • 10-year warranty for long-lasting protection
  • CE & HETAS approved for safety and compliance
  • Quick to install with individually boxed components
  • Available in stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

5" Base Support - Black
From £139.00
  • Supports up to 20m of twin wall flue for tall installations
  • Adjustable from 50mm-80mm for flexible positioning
  • Suitable for solid fuel, gas, and oil appliances
  • CE & HETAS approved for safety and compliance
  • Available in stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Twin Wall 5-Inch Flue

A 5-inch twin wall flue kit from this range can be used when there is no constructed chimney available. They are often used in period or new build properties without chimneys, as well as in conversions and renovations where the chimney stack has been removed or the stoves desired position is not where the chimney is located.

In this range, you’ll find a choice of 5-inch twin wall flue pipes in black, the perfect versatile colour for completing your set up. On top of this, there are twin wall insulated flue components to suit most requirements in this range, whether it be long, short, or adjustable lengths, or 15-, 30- or 45-degree angled bends.

Frequently Asked Questions

What is the distance to combustible material for a 5" twin wall flue?

Every piece of twin wall flue in our collection has been tested rigorously and can be installed within 60mm of non-combustible material. This is a great advantage when fitting a flue system in a loft space or past ceiling joists as it means your system can be positioned relatively close to the timber work.

What is the outside diameter of a 5" twin wall flue pipe?

The outside diameter of a 5" twin wall flue system measures 7" (175mm). The inner and outer steel skin of our twin wall flue pipe is packed with high-quality insulation which keeps the flue gases warm for a great draught and also ensures the flue can be installed within 60mm of combustible materials.

Can I install a twin wall flue system myself?

Installing a twin wall flue system is a considerable task and may involve equipment like tall ladders or scaffolding if access to your roof is required. Connecting sections of twin wall flue pipe is technically very straightforward and specialist skills are not required, you'll still need to ensure that you follow building regulations for your own safety.

Buy a 5-inch twin wall flue pipe or kit from StovesAreUs today. And make sure to browse our wider range of chimney essentials for flexible flue liners, chimney cowls, and more.

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