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National Flues brings you the Twin Wall to Twin Wall Increaser (Ø200-Ø250), a premium chimney flue upgrade solution built for efficiency and safety. This high quality flue component is perfectly suited for a variety of heating appliances such as solid fuel stoves, gas boilers, and oil furnaces. Enhance your home’s heating performance with this versatile chimney upgrade that meets rigorous HETAS and CE standards.
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£107.49
with free delivery
Give us a call if you find it cheaper and we'll try to price match.
At a Glance
Safely increases flue diameter from Ø200 to Ø250 mm
HETAS approved and CE-marked
Durable stainless steel construction (304 outer, 316L inner)
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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 Twin Wall to Twin Wall Increaser (Ø 200 - Ø 250) is a premium quality component designed to safely and effectively increase the diameter of your chimney flue system. Suitable for use with solid fuel, gas, and oil appliances, this increaser can enhance the performance of woodstoves, gas coal effect fires, oil and gas boilers, and other solid fuel units. Constructed with a robust 304-grade stainless steel outer skin and a 316-grade stainless steel inner skin, both 0.4mm thick, this component ensures durability and resilience.
The insulation comprises high-density compressed rockwool (200kg/m3), providing excellent thermal protection. All parts are fully welded for superior strength. With a 50mm clearance from combustibles, you can rest assured that your installation is both safe and compliant.
The TWPro system is HETAS-approved and CE-marked, adhering to EN1856-1 standards. Installation is a breeze with the use of a Locking Band to secure the parts together.
SKU: 2-200-004
Technical Specifications
Flue Diameter
Increases from u00d8200 mm to u00d8250 mm
Inner Material
316L Stainless Steel, 0.40mm thick
Outer Material
304 Stainless Steel, 0.40mm thick
Insulation
High-density compressed rockwool (200kg/mu00b3)
Compliance
HETAS approved, CE marked, compliant with EN1856-1
Clearance
50mm from combustible materials
System
TWPro
Installation
Secured using a Locking Band
Installation is straightforward but must be undertaken with attention to detail. Ensure that the increaser is fitted securely using the provided Locking Band. Always maintain a minimum 50mm clearance from any combustible surfaces. Read all provided installation instructions carefully and ensure compliance with EN1856-1 standards. For complex set-ups or if you are uncertain, consult a professional installer familiar with the TWPro system to guarantee safe and efficient operation.
A Twin Wall to Twin Wall Increaser is used to safely increase the diameter of your chimney flue system, ensuring proper draft and performance for larger flue connections.
Yes, the Twin Wall to Twin Wall Increaser can be used with solid fuel appliances, including woodstoves and coal effect fires.
The increaser is made from high-quality 304-grade stainless steel on the outside and 316-grade stainless steel on the inside, both with a thickness of 0.4mm.
The Twin Wall to Twin Wall Increaser uses compressed rockwool insulation with a density of 200kg/m3 to provide excellent thermal efficiency and protection.
The increaser is installed using a Locking Band that securely connects the Twin Wall flue parts together. Ensure a 50mm distance from any combustible materials during installation.
Yes, the Twin Wall to Twin Wall Increaser is HETAS approved and CE-marked, complying with EN1856-1 standards.
Absolutely. The Twin Wall to Twin Wall Increaser is suitable for gas and oil appliances, making it versatile for various heating 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 Twin Wall to Twin Wall Increaser Ø 200 - Ø 250 buyers guide
Comprehensive Buyers Guide for the Twin Wall to Twin Wall Increaser (Ø200 - Ø250)
When investing in your home's heating system, choosing the right chimney flue components is critical for both safety and performance. The Twin Wall to Twin Wall Increaser is engineered to offer a seamless upgrade to your existing system, stepping up the flue diameter from Ø200 mm to Ø250 mm. This guide will provide you with all the important details, answer common questions, and address any concerns you may have regarding this product.
Understanding the Product
The Twin Wall to Twin Wall Increaser is designed for homeowners and professionals who require a reliable and compliant solution for increasing the diameter of their chimney flue systems. The increaser is a critical component that ensures proper draft performance, which is essential for the safe operation of heating appliances such as woodstoves, gas boilers, oil-fired heaters, and even coal-effect fires. Crafted from premium stainless steels (304 on the outside and 316L on the inside), this increaser features a robust build that promises longevity and resistance to corrosion.
Key Benefits and Features
Safety First: One of the standout features of this increaser is its ability to improve the draft within your chimney safely. The stipulated 50mm clearance from combustibles ensures that, even under prolonged usage, your home remains safe.
Regulatory Compliance: The product is fully HETAS approved and CE-marked, ensuring it adheres to the stringent EN1856-1 standards. This guarantees that in every installation, you are meeting the highest safety and performance criteria expected of modern heating systems.
Durable, High-Quality Materials: With a dual-layer stainless steel construction, you’re ensured that this product can withstand the rigours of regular use. The inner layer made from 316L stainless steel and the outer layer from 304 stainless steel both have a thickness of 0.40mm, contributing to the overall sturdiness of the unit.
Effective Insulation: The high-density compressed rockwool, with a density of 200kg/m³, acts as an excellent thermal insulator, limiting heat loss while protecting the surrounding area from excessive temperatures.
Ease of Installation: Designed keeping user convenience in mind, the increaser comes with a Locking Band that makes installation simple and secure. Even if you are not a professional installer, you might find the installation process straightforward as long as you adhere to the provided guidelines.
Addressing Common Concerns
What if I have doubts about installation?
For many, installation might seem daunting. However, the product is designed for ease and safety. Maintaining the required 50mm clearance and using the Locking Band as per the instructions ensures that the installation not only complies with safety standards but is also efficient. Professional installers are always available if you need additional guidance.
Is this upgrade compatible with my current heating system?
Absolutely. Whether your home employs wood, oil, or gas heating systems, the Twin Wall to Twin Wall Increaser is versatile enough to integrate seamlessly with various flue configurations. This adaptability ensures that you achieve the same high level of performance regardless of the fuel type used.
How does this product enhance my heating efficiency?
The set-up is designed to ensure optimal draft, which directly contributes to the efficiency of your heating system. A better draft means improved combustion, which leads to a more efficient and environmentally friendly heating process. This efficiency is further elevated by the superior qualities of the materials used in the construction of the increaser.
Why Choose National Flues?
National Flues is a name synonymous with quality and reliability in the heating industry. With years of expertise, they provide products that are not only high performing but also geared towards ensuring maximum safety. Their competitive pricing and excellent customer service have made them a popular choice among trade professionals and homeowners alike.
Installation and Maintenance Tips
Before Installation: Always confirm that you have a minimum clearance of 50mm from any combustible materials. Check that all components are free from any damages that might have occurred during transit.
During Installation: Follow the detailed instruction manual provided with your increaser. Use the Locking Band to secure each section to ensure a robust and leak-proof connection. If in doubt, consult a professional to avoid any installation pitfalls.
After Installation: Regularly inspect your flue system for any signs of wear or damage. Routine maintenance not only prolongs the life of the increaser but also ensures that the overall system is operating safely and efficiently.
Final Thoughts
Choosing the right chimney flue increaser is pivotal in ensuring that your heating system runs safely and efficiently. The Twin Wall to Twin Wall Increaser (Ø200 - Ø250) stands out as a premium choice given its durable construction, excellent thermal protection, and compliance with industry standards. With a focus on safety and performance, this product is ideal for various heating systems, making it a versatile addition to your home or professional setup. It addresses every potential concern from installation ease to long-term durability, leaving you with a product you can trust.
In summary, if you are looking for a reliable method to upscale your flue system without compromising on safety or efficiency, the Twin Wall to Twin Wall Increaser from National Flues is the definitive solution. With its comprehensive design and industry-leading quality, it is a worthwhile investment that ensures better performance and long-term satisfaction. Invest in quality, safety, and efficiency – invest in your home’s future.
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