Increaser - Ø 650
At a Glance
- Premium 316L stainless steel construction
- Modular design for seamless flue diameter transitions
- CE marked and compliant with EN 1856-1 standards
- Suitable for both high and low temperature applications
- Easy push-fit jointing secured with a Locking Band
- Versatile for boilers, ovens, ventilation systems, and chimney liners

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]
- Info
- Specs
- Install
- FAQs
The SWPro Increaser - Ø 650 is a premium modular single-wall flue system crafted from 316L grade stainless steel. This versatile increaser is designed to seamlessly transition between different diameters, meeting the demands of both high and low temperature applications, whether non-condensing or condensing, and in positive or negative pressure environments. Ideal for use with boilers, ovens, ventilation systems, and as a chimney liner, this increaser ensures optimal performance and safety.
The high-pressure sealing gasket (P1/H1) enhances its durability and efficiency, while the CE marking and adherence to EN 1856-1 standards guarantee quality. The SWPro system features a straightforward push-fit jointing mechanism secured with a Locking Band, ensuring secure and easy installation. Remember to fit jointing gaskets in P1 and H1 installations and maintain a 50mm distance from any combustible materials.
SKU: 3-650-002
Technical Specifications | |
---|---|
Model | Increaser - u00d8 650 |
Material | 316L Stainless Steel |
Compliance | EN 1856-1, CE marked |
Fuels Compatible | Gas, Oil |
Minimum Clearance | 50mm from combustibles |
Installation Type | Push-fit joint with Locking Band |
Warranty | 10 Years |
Applications | Boilers, ovens, ventilation systems, chimney liners |
System | SWPro |
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. If you find it cheaper within 48 hours, we'll refund the difference.
Compatible and other products that may be of interest...
National Flues Ltd Verdict
The SWPro Increaser - Ø 650 is an essential component for any high-performance flue system. Its robust 316L stainless steel construction ensures longevity and reliability. With our nationwide delivery service, both retail and trade customers can benefit from our competitive pricing and reliable supply.
The SWPro Increaser - Ø 650 is designed to adapt one flue diameter to a larger one, ensuring seamless transitions in chimney and ventilation systems.
National Flues is a leading supplier of fireplaces and flues across the UK. Known for their unbeatable prices, reliable delivery service, and excellent customer care for both retail and trade clients, National Flues stands out as a trusted name in the industry.
