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Elevate your heating system with National Flues’ KC Twin Wall to Twin Wall Increaser, a premium solution engineered for safe flue transitions. This stainless steel increaser is ideal for wood, gas, and oil appliances, offering robust performance backed by HETAS approval and CE marking. Designed to ensure efficient venting and enhanced safety, it is the go-to accessory for upgrading your chimney system.
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£47.99
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At a Glance
Designed for optimal safe venting between 100mm and 125mm diameters
Premium 304 & 316L stainless steel construction for durability
Suitable for wood, gas, oil, and low sulphur coal appliances
HETAS approved and CE marked for reliable safety
Compressed rockwool insulation maintains a safe 60mm gap from combustibles
Easy and secure installation using a Locking Band
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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.
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.
The KC Twin Wall to Twin Wall Increaser (Ø 100-Ø 125) is an essential component for anyone installing solid fuel, gas, or oil appliances. This increaser is expertly designed to ensure safe and efficient venting of your appliance. Constructed with an outer skin of 304 grade stainless steel and an inner skin of 316 grade stainless steel, both at a thickness of 0.4mm, this increaser promises durability and resilience.
The insulation, made from compressed rockwool with a density of 128kg/m3, not only enhances performance but also ensures safety by maintaining a 60mm distance to combustibles. Fully welded for strength and longevity, this product is HETAS approved and CE marked, meeting rigorous safety and quality standards (Designations EN1856-1 T600 N1 W V2 L50040 G60 and EN1856-1 T200 P1 W V2 L50040 O20). It's perfect for use with woodstoves, gas coal effect fires, oil boilers, and any solid fuel appliances.
Installation is straightforward, with parts secured by a reliable Locking Band, ensuring a secure and safe fit.
SKU: 10-100-004
Technical Specifications
Model
KC Twin Wall to Twin Wall Increaser
Diameter Range
u00d8 100mm to u00d8 125mm
Outer Material
304 Stainless Steel (0.40mm thick)
Inner Material
316L Stainless Steel (0.40mm thick)
Insulation
Compressed Rockwool (128kg/m3 density)
Approvals
HETAS / CE
Distance To Combustibles
60mm
Installation
Locking Band secure assembly
Warranty
12 Years
Before installation, ensure that the flue diameter matches your system (100mm to 125mm) and that a minimum 60mm gap from combustibles is maintained for safety. Securely join the twin wall sections using the integrated Locking Band, following the manufacturer’s guidelines and local building regulations. If any uncertainty arises during installation, consult a certified professional to ensure compliance with all safety standards.
Yes, the KC Twin Wall to Twin Wall Increaser is suitable for solid fuel, gas, and oil appliances.
Absolutely, this product has HETAS approval, ensuring it meets high safety and performance standards.
The outer skin is made from 304 grade stainless steel, and the inner skin is 316 grade stainless steel, both 0.4mm thick.
The insulation is made from compressed rockwool with a density of 128kg/m3, providing excellent performance and safety.
Installation is easy; the Twin Wall parts are secured together using a Locking Band, ensuring a robust fit.
A 60mm air gap should be maintained between the flue’s outside and any combustible materials like wood or plasterboard.
Yes, it meets the CE marking standards, ensuring compliance with European safety and quality regulations.
Delivery Information +
We work relentlessly to ensure you get your order fast.
Estimated delivery for this product is Tuesday, April 29th.
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 KC - Twin Wall to Twin Wall Increaser - Ø 100-Ø 125 buyers guide
Introduction
The KC Twin Wall to Twin Wall Increaser by National Flues is a high-quality solution specifically designed to bridge the gap between different flue diameters while maintaining top safety and performance standards. Whether you are upgrading your existing installation or designing a new system for wood, gas, or oil appliances, this increaser provides an unbeatable combination of durability, safety, and ease of installation.
Key Features and Safety Benefits
High-Grade Stainless Steel Construction:
The increaser features an inner lining of 316L stainless steel and an outer skin of 304 stainless steel, both with a thickness of 0.40mm. This dual-layered approach not only enhances structural integrity but also offers excellent resistance to corrosion. Such robust materials are essential for ensuring a long life span, even in challenging heating environments.
Efficient Insulation with Compressed Rockwool:
To provide secure and efficient performance, the increaser is insulated with compressed rockwool at a density of 128kg/m3. This insulation plays a crucial role in maintaining a safe 60mm clearance from any combustibles, thus significantly reducing the risk of fire hazards. The insulation is designed to adapt to temperature fluctuations, ensuring that your appliance operates safely and efficiently.
Certification and Approvals:
One of the most important aspects of any safety-critical installation is the level of certification. This product is HETAS approved and CE marked, standing as a testament to its conformance with rigorous safety guidelines and quality standards. These certifications guarantee that the product has undergone strict testing, providing a dependable solution for your heating system.
Simple and Secure Installation:
The design includes an intuitive Locking Band that ensures a secure assembly of the twin wall sections. Installation is straightforward, with clear instructions provided to ensure that even those with limited technical experience can achieve a safe and effective setup. Maintaining the correct installation standards not only guarantees optimized performance but also safeguards your investment in the long run.
Advantages of Upgrading with the KC Increaser
- Enhanced Durability: The utilisation of premium stainless steel materials ensures that your flue system remains strong and resilient over many years of service.
- Increased Safety: With proper insulation and a mandatory clearance from combustibles, the increaser significantly mitigates potential fire risks.
- Versatility: Designed to work seamlessly with various fuel types—including wood, gas, oil, and low sulphur coal—this increaser is a versatile option suitable for a range of appliances.
- Future-Proofing Your Installation: Investing in high-quality components like the KC Twin Wall Increaser ensures that your heating system remains efficient and reliable, irrespective of changes in the appliance landscape or strict regulatory environments.
Installation Best Practices and Regulations
When installing the KC Twin Wall Increaser, adherence to manufacturer guidelines and local regulatory standards is paramount. First, ensure that the flue system has been properly assessed to determine the correct size and configuration. The installation should always maintain a minimum 60mm gap from any surrounding combustible material. It is advisable to use professional services if you are not completely confident in your installation skills. National Flues also offers guidance and additional accessory options that can help tailor your setup to meet specific requirements.
Optional Accessories and System Enhancements
While the KC Increaser is an effective standalone solution, National Flues provides a range of optional accessories that can further optimise your installation. Accessories such as additional flue connectors, heat shields, and maintenance tools can help you enhance the overall performance of your heating system. These options allow for a fully customised setup, ensuring that every component of your system works in harmony to deliver maximum efficiency and safety.
Frequently Asked Questions
Q: What fuels can be used with the KC Increaser? A: The increaser is designed for use with wood, gas, oil, and low sulphur coal appliances, making it extremely versatile for various heating needs.
Q: Is the product compliant with current safety standards? A: Yes, with HETAS approval and CE marking, it meets and exceeds the necessary safety criteria required in the industry.
Q: How does the Locking Band installation system improve security? A: The Locking Band ensures a firm and secure fit between the flue components, reducing the risk of gaps or dislodgement during operation. This feature is crucial for maintaining the overall integrity of your installation.
Conclusion
In summary, the KC Twin Wall to Twin Wall Increaser from National Flues represents a significant upgrade for any heating system requiring a transition between flue diameters. Combining high-quality materials, strict safety standards, and user-friendly installation methods, this increaser is a smart investment for both residential and commercial applications. Its advanced design ensures that your heating appliance operates efficiently while minimising risks associated with flue installations. With the backing of respected certifications such as HETAS and CE, you can trust that this product meets the highest standards in the industry.
Whether you are a professional installer or a DIY enthusiast, the intuitive design and comprehensive support offered by National Flues make it an attractive and reliable choice. The enhanced durability, straightforward installation, and compatibility with a wide range of appliances mean that you can have confidence in your heating setup for years to come.
For those looking to further optimise their systems, additional accessories are available to complement and enhance the performance of the KC Increaser. Exploring these optional components can provide extra features such as improved heat reflection, easier maintenance, and future expansion capabilities.
National Flues remains committed to delivering products that combine quality, safety, and efficiency, ensuring that every installation meets the exacting demands of modern heating systems. With over a decade of expertise, their KC Twin Wall to Twin Wall Increaser is a testament to innovative engineering and rigorous quality control.
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