Adjustable | Twin Wall Flue External System | Single Storey | 4.5m

Create a fully HETAS-compliant external flue system with this pre-configured 4.5 metre twin wall kit, designed for safe and reliable installations on properties requiring an external stove flue.

Featuring four bends and a telescopic section, this system provides excellent flexibility during installation, while also allowing easy access for cleaning and ongoing maintenance. It is the ideal solution where offsets or clearances are needed around roof overhangs, fascia boards, or gutters.

What’s Included in the Kit

1. TWPro MB – Flat Adaptor – Ø 125 (Qty: 1)

• Connects your stove outlet to the twin wall system

• Black-coated 304 stainless steel outer, 316L stainless inner

• 25 mm compressed rock wool insulation

• CE marked & HETAS approved

• 50 mm clearance from combustibles

2. TWPro MB – Pipe 1000 mm – Ø 125 (Qty: 2)

• Twin wall insulated flue pipes (effective length ~965 mm each)

• 25 mm injected insulation, 190 kg/m³ density

• Fully welded with integral locking band

• EN1856-1 certified

3. TWPro MB – Rain Cap – Ø 125 (Qty: 1)

• Prevents rain ingress while maintaining efficient exhaust flow

• Cone-top design, corrosion resistant

4. TWPro MB – 45° Bend – Ø 125 (Qty: 3)

• Enables offsets to navigate obstructions

• Maintains insulation and certification integrity

• Supplied with locking bands

5. TWPro MB – 135° Tee – Ø 125 (Qty: 1)

• Provides cleaning access at the base of external runs

• EN1856-1 certified & HETAS approved

• Includes locking band

6. TWPro MB – Tee Cap – Ø 125 (Qty: 1)

• Seals the base of the 135° Tee

• Threaded condensate drain outlet

7. TWPro MB – Wall Support 50–80 mm – Ø 125 (Qty: 2)

• Adjustable mounting brackets (50–80 mm standoff)

• Black finish to match flue system

• Suitable for internal or external mounting

8. TWPro MB – Retro Fit Base Support – Ø 125 (Qty: 1)

• Provides foundational support to the flue stack

• Anchors securely to wall or slab

• Supplied with locking band

9. TWPro MB – Pipe 500 mm – Ø 125 (Qty: 1)

• Shorter rigid section for height adjustment

• Same construction and certification as full-length pipes

10. TWPro MB – Adjustable Pipe 350–500 mm – Ø 125 (Qty: 1)

• Telescopic section for flexible final height adjustment

• Supplied with insulation wrap and locking band

Certification & Standards

• CE Marked and HETAS Approved

• EN1856-1 T600 N1 W V2 L50040 G50

• Safe 50 mm clearance to combustibles

• 25-Year manufacturer warranty on stainless steel components (2 years on painted finish)

Suitable For

• External installations on properties without chimneys

• Bungalows, cabins, outbuildings, and extensions

• Wood-burning and multi-fuel stoves designed for Ø 125 mm twin wall systems

Delivery & Returns

• Standard UK delivery: 2–5 working days

• Free collection available from our Wickford showroom (Unit 28A, Alpha Garden Centre, London Road, Wickford, SS12 0JX)

• Returns accepted within 14 days for unused, uninstalled items in original packaging. Installed products cannot be returned unless faulty. See our [Returns Policy] for details.

Professional Support

Our technical team is here to help with installation advice or to discuss customised flue configurations. Contact us on 01268 744555 or info@essexlogburners.co.uk for expert guidance.