× National Flues
We have 100% 5 Star Reviews on Trustpilot
Free Delivery on All Orders Over £100
Enjoy Our Free Flue Design Service
Delivery To Mainland UK Addresses
Call Our Experts on 01670 206999

Non-concentric increaser 2 diameters - Ø 250 (3-250-104)

Discover the superior quality Non-Concentric Increaser Ø 250 by National Flues. This high-performance flue adaptor, expertly crafted from 316L Stainless Steel, is designed to seamlessly increase your flue system's diameter, making it indispensable for both residential and commercial heating applications. Whether you require a solution for preventing condensate pooling or enhancing overall ventilation performance, this adaptor stands out as a reliable and cost-effective choice. Trust National Flues for innovative flue solutions that deliver both safety and efficiency while meeting the highest industry standards.
£255.99
with free delivery Give us a call if you find it cheaper and we'll try to price match.

 

Payment Options

At a Glance

    Fabricated from high-grade 316L Stainless Steel
    CE Marked and compliant with EN 1856-1 standards
    Designed for both condensing & non-condensing applications
    Quick push-fit installation with a Locking Band
    Maintains the mandated 50mm distance from combustibles

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]

The Non-Concentric Increaser Ø 250 is a crucial component of the SWPro modular single wall flue system, fabricated from high-grade 316L stainless steel. Known for its high-pressure sealing capabilities (P1/H1), this versatile flue adaptor is perfect for various heating and ventilation systems. Whether you're dealing with high-temperature, low-temperature, non-condensing, or condensing applications, the Non-Concentric Increaser ensures optimal performance.

It's designed for easy installation with a push-fit jointing system secured by a Locking Band, and safe usage, maintaining a mandatory 50mm distance from combustible materials. CE marked under EN 1856-1 standards, this increaser stands out for its reliability and durability.

SKU: 3-250-104

Technical Specifications
Product SKU3-250-104
Material316L Stainless Steel
SystemSWPro
Flue Rangeu00d8 250 up to u00d8 400
ComplianceCE Marked, EN 1856-1
Warranty10 Years
Distance To Combustibles50mm
ApplicationsCondensing & Non-condensing, Gas & Oil
Installation is straightforward with the push-fit jointing system. Begin by ensuring that each connection is correctly aligned and fitted with jointing gaskets. Secure the assembly firmly using the Locking Band. Always maintain a 50mm distance from combustible materials to adhere to safety guidelines. For P1/H1 rated installations, double-check the pressure seals at every joint to guarantee leak-proof performance. Follow the manufacturer's guidelines closely, and consult a professional if you are unsure about any step during the installation process.

The Non-Concentric Increaser is made from high-grade 316L stainless steel, providing excellent durability and corrosion resistance.

Yes, it is suitable for both types of applications, handling flue gases in positive and negative pressure environments with ease.

The SWPro system features a modular design with high-pressure sealing gaskets, making it versatile and easy to install. It is ideal for various applications including boilers, ovens, and ventilation systems.

Installation is straightforward with its push-fit jointing system, secured using a Locking Band. For P1 and H1 installations, make sure to fit jointing gaskets on every joint.

Ensure a 50mm distance from any combustible materials such as wood or plasterboard to prevent any potential fire hazards.

Yes, the Non-Concentric Increaser is CE marked and complies with the EN 1856-1 regulations, ensuring it meets high safety and performance standards.

This product is designated under EN 1856-1: T200 H1 W Vm L50050 O(50) - Ø 250 up to Ø 400, ensuring exceptional quality and compliance.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, May 20th. Delivery times of products not in our warehouses depend on product availability and shipping. If you need a definitive delivery time give us a call. If you need faster stove or fireplace delivery please also give us a call. We can sometimes 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 Non-concentric increaser 2 diameters - Ø 250 buyers guide

Don’t compromise on quality—choose National Flues for unmatched reliability and performance.

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal
Free Design Service Click To Call Our Experts