Vaillant vertical roof flue Ø110/160 mm, black (extension approx. 1.5 m above roof)

Product detailed description

Vaillant vertical roof flue Ø110/160 mm, black (extension approx. 1.5 m above the roof)

The vertical roof flue Ø110/160 mm is a concentric (coaxial) outlet of the flue gas path of a Vaillant condensing boiler, designed to pass through the roof structure and safely discharge flue gases above roof level. Unlike the simple (single-wall) Ø130 mm system used in other parts of this accessory range (extensions, elbows, T-piece, connection sets), this is a concentric duct, where the inner pipe with a diameter of Ø110 mm discharges flue gases outward, while the outer pipe with a diameter of Ø160 mm supplies combustion air inward to the boiler burner - a typical solution for closed (turbo) condensing boilers that draw combustion air directly from the exterior through the same concentric duct through which the flue gases are discharged (a configuration corresponding to type C33 according to the European flue gas duct classification).

Construction and dimensions of the extension

This particular part is designed as a roof extension with a total length covering approximately 1.5 metres above roof level and approximately 0.5 metres inside the roof structure (downward, towards the connecting concentric or reduced piping leading from the boiler). The outer surface of the part protruding above the roof has a black (dark) surface shade, which is a common design for roof outlets with regard to aesthetic matching with the roof covering (dark roof outlets are less conspicuous on most types of roof coverings than light-coloured alternatives), as well as better UV and weather resistance of the surface treatment used on the exterior part of the component.

Technical characteristics

• Diameter (concentric): Ø110/160 mm (inner pipe flue gas Ø110 mm, outer pipe air Ø160 mm)
• Length above roof: approx. 1.5 m
• Length inside roof structure: approx. 0.5 m
• Surface finish: black (dark), weather and UV resistant
• Material: plastic resistant to weather conditions (UV radiation, rain, snow, frost) and flue gas condensate
• Operation type: pressurised, concentric system type C33 (roof outlet)
• Purpose: terminal (roof) element of the flue gas path of Vaillant condensing boilers with concentric ducting
• Manufacturer: Vaillant Group
• Warranty: 2 years

Difference from the simple Ø130 mm system in this accessory range

It is important to emphasise that this roof flue works with a different flue gas ducting logic than other parts in this range (extensions, elbows, T-piece, connection sets S1/S2/S3, Ø150/130 mm reducer), which form a simple (single-wall) system with a diameter of Ø130 mm, designed primarily for connection to an existing masonry shaft or a cascade collector route, where the combustion air is either taken from the boiler room space or ducted separately. This concentric Ø110/160 mm part, on the other hand, solves a completely independent outlet directly through the roof without using a masonry shaft, with integrated combustion air supply in the same pipe - suitable especially for installations where no suitable existing shaft is available, or where a direct roof penetration by the shortest route is required.

On atria.sk, alongside this code (0020106371), there is also a separate product "Vaillant Vertical Roof Flue" (code 303900) - this is a different item in the manufacturer's catalogue, which may represent a different length or dimensional variant of the same family of roof outlets. Before ordering, we recommend verifying the exact code and dimensions required for your specific boiler type and installation situation, or consulting a Vaillant technician about which code matches your project.

Where this type of outlet is used

Concentric roof outlets are typically chosen for:

• new buildings, where a direct roof penetration without a masonry shaft is planned in advance,
• renovations, where no suitable chimney or shaft is available and the simplest solution is to route the flue gas path directly through the roof above the boiler,
• installations where, for space or aesthetic reasons, it is preferred to minimise the length of ducting inside the building,
• situations requiring closed (turbo) boiler operation with combustion air drawn directly from the exterior, independent of the air in the boiler room (particularly advantageous in spaces with limited or contaminated air).

Installation and sealing of the roof penetration

Installing a roof outlet is structurally more demanding than installing a standard flue gas path component inside the building, as it also involves ensuring the watertightness of the penetration through the roof covering. The procedure includes:

1. Marking and cutting an opening in the roof based on the diameter and position of the outlet according to the project documentation.
2. Installing the roof collar/flashing (usually part of a complete installation kit or supplied as a separate additional part depending on the type of roof covering) ensuring the watertightness of the penetration.
3. Connecting the inner part of the outlet with the connecting piping leading from the boiler, checking the correct sealing of the plug-in joints.
4. Installing the extension itself at the required height above the roof (approx. 1.5 m), anchored against wind and mechanical stress caused by weather conditions.
5. Checking the overall stability and watertightness of the joint with the roof covering after completing installation, ideally also a visual check after the first heavy rain.

Installation of the roof penetration requires cooperation between a heating company (connection to the flue gas path) and a roofing/sheet metal company (watertight installation into the roof covering) - we recommend coordinating the work so that both the functionality of the flue gas discharge and the watertightness of the roof at the penetration point are ensured.

Weather resistance and why the black colour

The part of the extension protruding above the roof is exposed throughout its service life to direct sunlight, rain, snow and frost. The black surface finish is chosen with regard to resistance to UV radiation (quality black plastic surface finishes are usually UV stabilised to prevent gradual embrittlement or fading of the material), and it also aesthetically fits well with the appearance of most common roof coverings (tiles, sheet metal, asphalt shingles in darker shades), unlike light-coloured or grey plastic outlets, which can look more disruptive on the roof.

Compatibility

This roof flue is designed for Vaillant condensing boilers with closed (turbo) operation requiring concentric ducting of flue gases and combustion air in a ratio of Ø110/160 mm. When connecting to the inner part of the flue gas path leading from the boiler, it is necessary to ensure compatibility of the diameters and type of joint with the specific boiler model - if in doubt about the correct choice of concentric system, we recommend consulting an authorised Vaillant technician or a heating system designer.

Maintenance

The roof outlet must be checked as part of regular flue gas path inspections (carried out by an authorised chimney sweep), not only in terms of the tightness and permeability of the pipe itself, but also in terms of the condition of the roof collar and the watertightness of the penetration through the covering, as long-term weather exposure (UV radiation, temperature cycles, snow) can affect the sealing elements at the roof penetration point over time. We recommend a visual inspection at least once a year, ideally before and after the winter season.

Why choose a genuine Vaillant part

The roof outlet is an exposed component that must simultaneously meet the requirements for gas-tightness of the flue gas path and watertightness of the roof penetration throughout the roof's service life. The genuine Vaillant part is designed and tested to handle both of these functions simultaneously under real weather conditions, with guaranteed compatibility with other concentric system parts. Using a non-original or incompatible outlet carries the risk of leaks - both in the flue gas path and in the roof itself.

Frequently Asked Questions

Standards and legislation

Installation of concentric roof flue gas outlets is subject to the same standards as other parts of the flue system (STN 73 4201, STN EN 1856 and related standards for concentric chimney systems), with additional requirements for clearance distances of the outlet from property boundaries, windows, ventilation openings and neighbouring buildings according to applicable regulations. The exact requirements for the placement of the roof outlet (minimum height above the roof, clearances) should be verified by a designer or Vaillant technician already at the installation design stage.

Closed (turbo) boiler operation - why the concentric system is advantageous

Condensing boilers with a closed combustion chamber (commonly also referred to as "turbo" operation) do not take combustion air from the boiler room space, but supply it independently directly from the exterior through the same pipe through which the flue gases are simultaneously discharged - this is made possible precisely by the concentric (coaxial) construction with an inner pipe for flue gases and an outer pipe for supplied air. This configuration brings several advantages over open (atmospheric) operation dependent on air in the boiler room:

• the boiler room does not need to be equipped with a separate large-cross-section air supply, which simplifies its placement even in smaller or more enclosed spaces,
• the combustion process is not affected by the quality or quantity of air in the boiler room (dust, other appliances drawing air from the room, etc.),
• the inlet air supplied through the outer pipe of the concentric duct is partially preheated by the heat of the flue gases discharged through the inner pipe, which slightly contributes to the overall efficiency of the combustion process.

This roof outlet Ø110/160 mm is designed precisely for this type of operation - it ensures both functions (flue gas discharge and air supply) in one compact component passing through the roof, without the need to solve a separate air supply in another way.

Why it is essential to verify compatibility before ordering

Concentric flue gas duct systems may differ between individual boiler ranges and between manufacturers in exact dimensions, type of joint, and even whether a given boiler is designed for closed (concentric) operation at all, or is only designed for open operation with a separate air supply. Before ordering this roof outlet, we therefore strongly recommend verifying in the technical documentation of your specific Vaillant boiler model whether it is designed for concentric ducting with exactly these dimensions (Ø110/160 mm), or having the compatibility confirmed by an authorised Vaillant service technician or heating system designer. An incorrectly chosen diameter or type of outlet may result in incompatibility of the joint with the connecting piping from the boiler.

Storage and handling before installation

We recommend storing the part in a dry environment before installation, protected from mechanical damage especially in the area of the sealing surfaces of the concentric joints. When handling the longer extension (approx. 2 m total length, including the part inside the roof), we recommend working in pairs to avoid damage when carrying it to the roof.

Summary

The vertical roof flue Ø110/160 mm represents a complete concentric solution for the roof outlet of the flue gas path of Vaillant condensing boilers with an integrated combustion air supply, suitable especially where an existing masonry shaft is not available. Installation requires cooperation between both the heating and roofing trades, with an emphasis on simultaneously ensuring gas-tightness and watertightness of the roof penetration. Before ordering, we recommend verifying the exact code and dimensions corresponding to your specific boiler type and project, ideally in cooperation with an authorised Vaillant service technician or heating system designer, who will confirm that this particular part is the correct choice for your installation.