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Single Wall to Twin Wall Increaser Ø 80 - Ø 100 (2-80-002)

Enhance your chimney system with the TWPro Single Wall to Twin Wall Increaser Ø 80 - Ø 100, the leading accessory for solid fuel, gas, and oil appliances. This premium increaser is engineered for a seamless connection between single wall and twin wall flue systems, offering unmatched durability, safety, and performance. Ideal for a wide range of heating solutions, it represents a robust, reliable upgrade to maximize your system’s efficiency.
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£18.49
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At a Glance

  • Manufactured with high-quality 304 and 316L stainless steel
  • Designed for a seamless single wall to twin wall transition
  • Compatible with solid fuel, gas, and oil appliances
  • Tapered design for safe, efficient installation
  • HETAS approved and CE marked

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

We Won't Be Beaten On Price

At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
  • Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
  • Operational Efficiency: We have streamlined processes to reduce overhead.

Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).

“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.

Have Questions?
Phone: 01670 206999
Email: [email protected]

Introducing the Single Wall to Twin Wall Increaser Ø 80 - Ø 100 mm, your perfect solution for connecting various heating appliances to TWPro flue systems. This increaser is crafted for compatibility with solid fuel, gas, and oil appliances including wood stoves, gas coal effect fires, and oil/gas boilers. Constructed with top-notch 304-grade stainless steel for the outer skin and reinforced by a 316-grade stainless steel inner skin, both 0.4mm thick, it ensures superior durability.

The insulation comprises high-density, compressed rockwool at 200kg/m3 for optimal heat resistance. Fully welded parts and a tapered design provide a seamless transition from single wall to twin wall. Keeping safety in mind, a mandatory distance of 50mm from combustibles like wood or plasterboard is required.

TWPro is HETAS Approved and CE marked, conforming to standards EN1856-1 T600 N1 W V2 L50040 G50 and T200 W V2 L50040 O20. Installation is user-friendly with Locking Band connectors, ensuring robust and secure fitting.

SKU: 2-80-002

Technical Specifications
SKU2-80-002
Product NameSingle Wall to Twin Wall Increaser u00d8 80 - u00d8 100
Inner Material316L Stainless Steel (0.40mm thick)
Outer Material304 Stainless Steel (0.40mm thick)
InsulationCompressed Rockwool at 200kg/m3
Diameter Rangeu00d8 80 mm to u00d8 100 mm
Applicable FuelsWood, Oil, Gas, Low Sulpher Coal
ApprovalsHETAS, CE Marked
ComplianceEN1856-1 Standards
Clearance50mm from combustibles
• Ensure a minimum clearance of 50mm from combustible materials such as wood or plasterboard. • The increaser’s tapered design facilitates a secure and user-friendly installation. • Use the provided Locking Band connectors to join the single wall and twin wall systems firmly. • Always follow local building regulations and the manufacturer’s installation instructions included with your purchase. • Inspect all parts before installation to ensure they are free from damage and meet performance standards.

This increaser can be used with solid fuel, gas, and oil appliances such as wood stoves, gas coal effect fires, and oil/gas boilers.

The outer skin is made from 304-grade stainless steel and the inner skin from 316-grade stainless steel. Both are 0.4mm thick, ensuring high durability.

Yes, the TWPro system, including this increaser, is HETAS Approved and CE marked.

A distance of 50mm must be maintained from the outer part of the flue to any combustible material like wood or plasterboard.

Installation is straightforward, using a Locking Band to secure the chimney parts together. Always ensure the correct clearance is maintained.

The insulation is made from compressed rockwool with a density of 200kg/m3, providing excellent thermal insulation and fire resistance.

Yes, this increaser is designed to connect both TWPro and single wall connecting flue pipes or vitreous enamel to TWPro systems.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. If you need faster stove or fireplace delivery please give us a call. We can often reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.

Warranty & Returns +

All our products come with warranties. Mi-Flex offers a lifetime guarantee. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

Price Match Guarantee +

We will match any price like for like on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Single Wall to Twin Wall Increaser Ø 80 - Ø 100 buyers guide

Upgrade your heating system today with our premium Single Wall to Twin Wall Increaser – secure yours now!

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