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National Flues presents the TWPro MB Increaser, a cutting-edge twin wall to twin wall flue adapter designed to increase your system's diameter from 80mm to 100mm. Engineered with premium 304 and 316L stainless steel, this increaser is essential for professionals and homeowners alike looking for a reliable, safe, and high-performance solution. Whether upgrading woodstoves, oil or gas boilers, or modern solid fuel appliances, this product exemplifies quality and efficiency in every detail.
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£61.99
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Increases flue diameter from 80mm to 100mm
Constructed from 304 & 316L stainless steel
0.4mm thick durable skins with high-temperature finish
Complies with HETAS and CE safety standards
Designed for woodstoves, oil/gas boilers, and more
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Please Note: All dimensions refer to the internal diameter of flues.
If unsure, please call 01670 206999 to ensure you choose the correct products.
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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.
The TWPro MB - Twin Wall to Twin Wall Increaser Ø 80-Ø 100mm is the ideal solution for adapting your flue system to accommodate a larger diameter. Perfect for use with solid fuel and gas/oil appliances including woodstoves, gas coal effect fires, oil boilers, and gas boilers, this increaser leverages precision engineering and top-notch materials. The outer skin is crafted from robust 304-grade stainless steel with a 0.4mm thickness, coated in a durable high-temperature black finish for both aesthetics and protection.
Inside, the 316-grade stainless steel inner skin is also 0.4mm thick, surrounding a layer of compressed rockwool insulation with a density of 200kg/m³ for exceptional heat retention and safety. Engineered to maintain a minimum distance of 50mm to combustible materials, this product passes stringent safety standards with HETAS approval and CE marking. All parts are fully welded, ensuring a strong, reliable fit.
Installation is straightforward with a Locking Band (supplied) to secure all components. Adhering to performance designations EN1856-1 T600 N1 W V2 L50040 G50 and EN1856-1 T200 P1 W V2 L50040 O20, you can have confidence in the product's supreme quality and reliability.
SKU: 37-80-004
Technical Specifications
Flue Diameter Increase
80mm to 100mm
Outer Material
304 Stainless Steel (0.4mm thick, high-temperature black coated)
Inner Material
316L Stainless Steel (0.4mm thick)
Insulation
Compressed Rockwool, 200kg/m³
Clearance
Minimum 50mm from combustibles
Approvals
HETAS / CE
Performance Designations
EN1856-1 T600 N1 W V2 L50040 G50 and EN1856-1 T200 P1 W V2 L50040 O20
Installation Accessory
Locking Band supplied
Installation of the TWPro MB Increaser is straightforward. Begin by ensuring the adjacent flue sections are clean and free of any obstructions. Position the increaser between the 80mm and 100mm flue sections, aligning the concentric circles carefully. Secure the assembly using the supplied locking band to fasten all components firmly, ensuring a sealed joint. Always maintain a minimum clearance of 50mm from combustible materials such as wood or insulation plasters. For best results, follow local building regulations and, if needed, consult a professional installer. Ensure that you have checked all the components for integrity before installation and always allow the flue system to cool before maintenance.
The TWPro MB Increaser is suitable for solid fuel and gas/oil appliances, including woodstoves, gas coal effect fires, oil boilers, and gas boilers.
The outer skin is made from 304 stainless steel with a high-temperature black finish, while the inner skin is composed of 316 grade stainless steel. Both skins are 0.4mm thick, and the insulation is made from compressed rockwool with a density of 200kg/m³.
Yes, it is HETAS Approved and CE marked, meeting all the necessary safety and quality standards in the UK.
The minimum clearance to combustible materials such as wood and plasterboard is 50mm.
Installation is straightforward and secure using the supplied Locking Band to join the components together. Ensure a 50mm distance from any combustible materials is maintained.
This product adheres to EN1856-1 T600 N1 W V2 L50040 G50 and EN1856-1 T200 P1 W V2 L50040 O20 performance standards.
Yes, the TWPro MB Increaser comes with a manufacturer's warranty, ensuring peace of mind and reliable performance.
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 TWPro MB - Twin Wall to Twin Wall Increaser - Ø 80-Ø 100mm buyers guide
TWPro MB Increaser Buyers Guide
The TWPro MB - Twin Wall to Twin Wall Increaser is designed with precision engineering and top-quality materials to enhance your flue system, ensuring efficient operation and safety. In this comprehensive guide, we will explore all aspects of this premium product to help you make an informed decision.
Understanding the Product
What is the TWPro MB Increaser?
The TWPro MB Increaser facilitates the upgrade of your flue system from an 80mm to a 100mm diameter. This expansion makes it suitable for a variety of applications, such as connecting woodstoves, oil boilers, gas boilers, and gas coal effect fires. The product is crafted using robust 304 stainless steel for the outer skin and 316L stainless steel for the inner layer, both maintained at a 0.4mm thickness. Additionally, the interstitial space is filled with compressed rockwool insulation (200kg/m³), which is critical for heat retention and safety.
Key Safety Features
Safety is paramount with the TWPro MB Increaser. The installation mandates a minimum clearance of 50mm from any combustible materials, thereby significantly reducing fire hazards. Furthermore, the product is HETAS Approved and CE marked, meeting stringent safety and quality standards in the UK. This assurance is particularly important for homeowners and professionals who demand reliability in every component of their heating systems.
Benefits and Applications
The benefits of using the TWPro MB Increaser are multifaceted:
• Versatility: Whether you are looking to upgrade existing equipment or install a new appliance, this increaser integrates perfectly into diverse flue systems.
• Durability: Its dual-layer construction using high-quality stainless steel ensures longevity and resistance against corrosion. The high-temperature black coating not only adds to its aesthetic appeal but also provides an extra layer of protection against the elements.
• Efficiency: With efficient rockwool insulation, the system reduces heat loss, ensuring that your heating appliances operate at optimal efficiency. This translates into reduced energy bills and a lower carbon footprint.
• Ease of Installation: Designed with the user in mind, the TWPro MB Increaser includes a locking band, simplifying the installation process while ensuring a secure and long-lasting connection between flue sections.
Installation Essentials
Proper installation is crucial for optimal performance. It is recommended that you have a clear working space and ensure that your flue system is clean before installation. Begin by unboxing all components and verifying that the locking band is present. Follow the step-by-step guide provided with the product, and always maintain the 50mm clearance from any combustible surface. If you are uncertain or require additional accessories such as extra support brackets or sealing materials, ensure you consult with our experts or search our optional accessories catalogue online.
Optional Accessories to Consider
While the TWPro MB Increaser comes with all necessary components, you might consider exploring additional accessories to further enhance your flue system. Accessories such as extended locking bands, additional insulation sleeves, and sealing gaskets are available to complement your installation. These optional components can fine-tune your system for even higher efficiency and safety. If you need more information about these accessories, our website offers a detailed catalogue or contact options to speak with a specialist.
Addressing Common Concerns
Will the TWPro MB Increaser fit my existing system?
Yes, it is designed to seamlessly connect between standard 80mm twin wall flues and 100mm systems. However, it is important to verify the setup of your existing installation before making any adjustments.
Is professional installation required?
While many customers successfully install the increaser on their own with our comprehensive guide, if you feel uncertain at any step, professional assistance is recommended.
What about maintenance?
Maintenance involves regular inspections to ensure that all connections are secure and there is no buildup of soot or insulation degradation. Periodically checking the locking band and the clearance around the flue will ensure lasting performance.
How does this product improve efficiency?
The double-layer stainless steel construction combined with the rockwool insulation ensures minimal heat loss. This not only maintains optimum performance but also contributes to energy savings over time.
Final Thoughts
The TWPro MB Increaser from National Flues is an investment in quality and safety. The product not only addresses the practical need to increase flue diameter but does so with an eye for longevity, safety, and efficiency. From its robust construction to its user-friendly installation, every detail has been meticulously designed to support both professional installers and DIY enthusiasts alike.
By considering the potential optional accessories available, you can further customise your flue system to meet your specific needs. Whether you require additional insulation, extra boarding options, or specialised sealing components, exploring these accessories can help you achieve the perfect setup. Our website offers a comprehensive range of these accessories to suit any flue system upgrade.
Make a choice that guarantees both performance and peace of mind. With the TWPro MB Increaser, you are not just buying a product but investing in a safer, more efficient heating solution for your home or facility. All aspects of its design, from fire safety clearances to the advanced materials used, have been optimised for performance.
Enhance your flue system today and experience the difference in quality that National Flues provides. Add to cart or call 01670 206 999.
Secure your TWPro MB Increaser today and transform your heating system with reliable performance.
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