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Boiler adaptor - Ø 125 (3-125-BA-153)

The National Flues Boiler Adaptor - Ø 125 is a high-performance component engineered for the SWPro modular single wall flue system. Constructed from premium 316L stainless steel and CE marked for safety, this adaptor is an ideal solution for boilers, ovens, ventilation systems, and chimney shaft liners. Enhance your installation with our reliable, industry-approved flue components and experience the superior quality that National Flues is known for.
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At a Glance

    Made from high-grade 316L stainless steel for exceptional durability
    CE marked and compliant with EN 1856-1 standards
    Designed for use with the SWPro modular single wall flue system
    Suitable for boilers, ovens, ventilation systems, and chimney shaft liners
    Easy push-fit jointing system secured with locking bands
    Maintains a safe 50mm clearance from combustible materials
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, June 20th. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

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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.

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:

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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).

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

The Boiler adaptor - Ø 125 is an essential component within the SWPro modular single wall flue system. Constructed from high-grade 316L stainless steel, it offers exceptional durability and performance. This universal flue system is suitable for both high and low temperature applications, accommodating condensing and non-condensing systems with positive and negative pressure.

Perfect for diverse uses such as boilers, ovens, ventilation systems, and as a chimney shaft liner. The SWPro system is CE marked and meets all necessary standards (EN 1856-1: T200 H1 W Vm L50040 and L50050) across various diameters. The push-fit jointing system, secured with Locking Bands, ensures easy installation.

For P1 and H1 installations, use jointing gaskets and maintain a 50mm distance from any combustible materials.

SKU: 3-125-BA-153

Technical Specifications
SKU3-125-BA-153
Product NameBoiler Adaptor - u00d8 125
Material316L Stainless Steel
ApprovalsCE
StandardsEN 1856-1: T200 H1 W Vm L50040 / L50050
SystemSWPro Modular Single Wall Flue System
FuelsGas, Oil
Warranty10 Years
Minimum Combustible Distance50mm
For optimum performance, ensure the adaptor is installed using the push-fit jointing system with secure locking bands. When installing on condensing appliances, apply a high-quality silicone sealant between the adaptor and the appliance outlet unless a built-in seal is provided. Always use jointing gaskets for P1 and H1 installations. It is critical to maintain a minimum clearance of 50mm from any combustible materials during installation to comply with safety standards and reduce fire hazards. Prior to installation, verify that all components are compatible with your existing SWPro flue system and that the installation environment meets the prescribed safety clearances.

The Boiler Adaptor - Ø 125 is made from high-grade 316L stainless steel, providing exceptional durability and resistance to corrosion.

The adaptor is suitable for a wide range of applications including boilers, ovens, ventilation systems, and as a chimney shaft liner.

Yes, the SWPro system, including the Boiler Adaptor - Ø 125, is CE marked and conforms to EN 1856-1 standards.

No, the SWPro system utilizes a push-fit jointing system secured with locking bands for straightforward installation.

Yes, for condensing appliances, the adaptor and appliance outlet should be sealed with silicone sealant unless a built-in seal is present at the outlet.

Maintain a distance of 50mm from the outside of the flue to any combustible materials like wood or plasterboard.

The standards apply to diameters from Ø 80 up to Ø 400, with specific construction details outlined for different ranges.

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