Vaillant flue extension 2.0 m, Ø 110/160 mm

Product detailed description

Vaillant flue extension 2.0 m, Ø 110/160 mm

The extension pipe with a length of 2.0 m is a basic building element of the Vaillant concentric flue system Ø 110/160 mm. It is used to bridge the distance between the boiler (or the manifold in a cascade connection) and the point of flue gas discharge – a roof terminal or a shaft connection. By combining several extensions of different lengths (2.0 m, as well as 0.5 m / 1.0 m / 2.0 m variants) and elbows, the exact route is designed according to the layout of a specific boiler room or plant room, without the need for any cutting or on-site modification of the pipes.

The pipe consists of two coaxial shells – an inner one through which flue gases flow, and an outer one through which combustion air is supplied to the boiler from the outlet location. Both ends are equipped with a bayonet lock with a seal, which allows a quick and gas-tight connection to adjacent parts (another extension, elbow, inspection piece, or direct connection to the boiler) without the need for gluing or welding.

Summary of technical parameters

• Part type: Extension (straight pipe)
• System diameter: Ø 110/160 mm (concentric)
• Length: 2.0 m
• Inner pipe material (flue gas): Polypropylene (PP), condensate resistance class W
• Outer shell material (air): UV-stabilized plastic
• Temperature class: T120
• Pressure class: P1
• Joint type: Bayonet lock with rubber seal (on both sides)
• Orientation: Universal – horizontal and vertical
• Intended for: ecoTEC plus VU 806/5-5 – 1206/5-5, ecoCRAFT exclusiv, ecoVIT exclusiv, cascade systems
• Country of origin: Germany / EU
• Brand: Vaillant
• Warranty: 24 months

Vaillant flue gas discharge system Ø 110/160 mm

The pipe system with a diameter of Ø 110/160 mm belongs to the family of concentric (coaxial) Vaillant flue systems designed for high-capacity gas condensing boilers with a higher nominal output – typically the ecoTEC plus VU 806/5-5, 1006/5-5 and 1206/5-5 range (output range approx. 80 – 120 kW), modular systems ecoCRAFT exclusiv and ecoVIT exclusiv, as well as cascade connections of multiple boilers to a common flue manifold. The inner pipe carrying flue gases is made of durable polypropylene (PP) with high thermal and chemical resistance to condensate (condensate resistance class W according to EN 14471), while the outer shell supplying combustion air is made of UV-stabilized plastic or aluminium depending on the specific part. The system is certified for temperature class T120, pressure class P1 (positive pressure system suitable for condensing boilers), and corrosion resistance class 1, which corresponds to the typical operating range of flue gases from condensing boilers (low-temperature flue gases, acidic condensates).

The Ø 110/160 mm system is installed exclusively using original Vaillant parts – individual components (extensions, elbows, inspection pieces, roof terminals, and mounting elements) are combined into an assembly exactly according to the layout of a specific boiler room or plant room. All joints are sealed with a silicone seal and a bayonet lock system, which ensures gas-tightness even over longer pipe runs and allows for easy installation and disassembly without the need for gluing or welding.

Comparison with other Vaillant flue system diameters

Vaillant offers concentric flue systems in several diameters depending on the boiler output – the smallest common diameter of Ø 60/100 mm is used for the majority of wall-mounted condensing boilers for houses and apartments (ecoTEC pro/plus range up to approx. 35 – 65 kW), while the Ø 80/125 mm diameter is used for boilers with higher output or for longer routes where a lower pressure loss is required. The Ø 110/160 mm diameter, which this part also belongs to, is intended for the highest common output segment (ecoTEC plus 806/5-5 – 1206/5-5, ecoCRAFT exclusiv, ecoVIT exclusiv) and cascade systems, where a substantially larger volume of flue gases needs to be discharged. Parts of different diameters are not interchangeable – it is therefore always necessary to verify the exact system diameter of your boiler or in the project documentation before ordering.

Compatibility with boiler models

The 2.0 m extension is a universal building element of the Ø 110/160 mm system, usable with all models that use this discharge diameter – the higher output ecoTEC plus range (806/5-5, 1006/5-5, 1206/5-5), the modular boiler systems ecoCRAFT exclusiv and ecoVIT exclusiv, as well as cascade connections with multiple boilers on a shared manifold. In practice, the 2.0 m length is most often combined with other available lengths (0.5 / 1.0 / 2.0 m) so that the total sum exactly matches the actual route from the boiler to the flue gas outlet point.

Typical usage scenarios

The 2.0 m extension is used wherever a specific section of the route between the boiler (or the previous part of the assembly) and the next element – another extension, elbow, inspection piece, or terminal outlet – needs to be bridged. When designing the route, the total required length is usually first determined based on the boiler room layout, and this length is then assembled from the available 2.0 m variants together with other lengths so that it matches the actual on-site conditions with an accuracy of tens of centimetres, without the need for any pipe cutting.

The estimated weight of this part (approx. 3.2 – 4.5 kg) corresponds to a typical handling load for one person during installation, but for a larger number of connected pieces in a single vertical branch, the total weight of the route must always be taken into account when designing supports and anchoring.

How to choose the correct extension length

Choose the 2.0 m length if you need to bridge a section of the route corresponding to exactly this distance, or if you will combine it with other lengths (0.5 m and 1.0 m) to achieve an exact total matching the actual route in your boiler room. We recommend measuring the actual route on site (from the boiler outlet to the planned flue gas discharge point) before ordering, and only then choosing the combination of lengths and elbows that most accurately covers this distance without the need for pipe cutting.

Installation and use

The 2.0 m extension is inserted into the flue gas discharge route at any point between the boiler and the terminal outlet (roof terminal, wall penetration, or shaft connection). During installation:

• the pipe is inserted into the previous part using the bayonet lock all the way to the stop – correct insertion is indicated by an audible/tactile click of the latch,
• the direction of condensate flow must always have a slight slope towards the boiler (or towards the condensate collection point), so that condensate does not accumulate at an incorrect point of the route,
• for longer vertical or horizontal sections (including this extension), the pipe must be continuously supported with mounting clamps or brackets at intervals according to the manufacturer's installation instructions, typically every 1 – 1.5 m,
• the maximum total route length (sum of all extensions and equivalent elbow lengths) is limited by the installation instructions for the specific boiler model – we recommend verifying the maximum allowed range before ordering multiple pieces.

The pipe can be used for both horizontal and vertical sections of the route, or in combination with elbows for angled routing.

Safety notices

Installation and connection of the condensing boiler's flue gas discharge system may only be carried out by an authorized and trained installation company with professional qualifications for gas equipment. An incorrectly assembled or leaking flue gas route can lead to the leakage of flue gases (including carbon monoxide) into living spaces, which poses a serious health risk. Use only original Vaillant parts of the corresponding diameter and certification – combining with parts from other manufacturers or of different diameters is not permitted and is in violation of the CE certification conditions of the entire assembly as well as the boiler warranty. After any intervention in the route (part replacement, service, inspection), a leak-tightness check must be performed before putting the boiler back into operation.

Maintenance and care

We recommend inspecting the flue gas discharge system at least once a year during the regular boiler service – especially the tightness of the joints, the patency of the condensate drainage (if part of the assembly), and the mechanical fastening along the entire route. The outer plastic parts (roof terminals, penetrations) should be visually inspected after the winter season for possible mechanical damage caused by ice or wind. The inside of the pipes does not accumulate deposits during normal operation the way traditional solid fuel chimneys do, but the inspection elements in the assembly (inspection elbows, inspection pieces, T-pieces) are specifically designed so that a service technician can easily look inside the pipe during an inspection and, if necessary, clean it without having to disassemble the entire route.

For boilers with a longer discharge route, we recommend keeping a simple service log of the date of the last leak-tightness check and the condition of the inspection openings – this will make it easier to plan further chimney inspections and provide an overview in case of a warranty claim or property sale.

Why buy this part at Atria.sk

We offer exclusively original Vaillant parts with 100% compatibility with this brand's flue gas discharge systems – no universal replacements of questionable quality that could compromise the gas-tightness of the entire assembly or void the boiler warranty. Goods are typically in stock or quickly available from the supplier, so the implementation of a boiler room or a service intervention is not delayed by a single missing part. If you are unsure which exact part you need for your assembly, we will be happy to advise you by phone or e-mail – just provide the boiler model and the length of the discharge route you need to bridge.

We typically process orders within one business day and dispatch in-stock items immediately. If you are not sure which exact part your project requires (for example, when combining several lengths and elbows into one route), we will be happy to help you choose the correct assembly before ordering – just send us a floor plan or photo of the installation location and information about the boiler model.

Frequently asked questions