Vaillant flue elbow 45°, Ø130 mm (2 pcs)

Product detailed description

Vaillant flue pipe elbow 45°, Ø130 mm (2 pcs)

The 45° elbow with a diameter of Ø130 mm is an original component of the Vaillant flue system, supplied in a pack of 2 pieces, designed for a gentler change of direction of the flue gas path than the sharp 87° elbow. The 45° angle represents the middle value in the range of angled components offered by the manufacturer (87°, 45°, 30°, 15°) and in practice is most often used in pairs - two 45° elbows placed one after another (or at both ends of a short straight section) can create a lateral offset in the route while maintaining the original direction of continuation, or split a combined 90° angle into two gentler bends instead of one sharp elbow. Made of polypropylene (PP) resistant to condensate and to the temperatures of flue gases from condensing operation, the elbow is part of a complete range of Ø130 mm accessories.

Technical characteristics

• Bend angle: 45°
• Nominal diameter: Ø130 mm
• Material: polypropylene (PP), resistant to condensate and to the temperatures of flue gases from condensing operation
• Type of operation: pressurised (type C), suitable for condensing boilers with forced flue gas extraction
• Maximum operating temperature: up to approx. 120 °C
• Joint type: push-fit (socket), with a rubber seal on both ends
• Pack: 2 pieces
• Manufacturer: Vaillant Group
• Warranty: 2 years

Why the 45° elbow is sold in pairs

Unlike the 87° elbow, which is generally used on its own for one significant change of direction, gentle angles such as 45° are in practice most often used in pairs. A typical reason is the need to create a lateral offset (shift) in the route while maintaining the original direction of continuation - for example, when it is necessary to bypass a structural obstacle (a beam, another pipe) and then continue parallel to the original direction, only shifted by a few centimetres to a few tens of centimetres. The first 45° elbow deflects the route, the second (after a short straight section) returns it back to the original direction of continuation. This is precisely why the manufacturer packs this component in pairs, so that the customer does not need to order two separate pieces for this common method of use.

Other ways of using the pair of 45° elbows

• Creating a combined 90° bend: instead of one sharp 87° elbow, two 45° elbows can be used one after another (with a short straight section between them), achieving a smoother change of direction with lower local flow resistance at each individual bend point.
• Compensating for a slightly inclined or imprecisely aligned shaft: in the case of minor deviations from the vertical in an existing masonry shaft, a pair of gentle elbows can help align the route to the required direction.
• Bypassing an obstacle on a longer route: when routing through a plant room or technical floor, where it is necessary to bypass an obstacle and continue in the original direction slightly higher, lower, or to the side.

Installation

Installation of 45° elbows is simple thanks to the push-fit (socket) joint system, but requires the professional competence of the installer, especially when designing the combination of both elbows for the desired final direction of the route:

1. Planning the exact position of both elbows and the length of the straight section between them (if used to create a lateral offset) according to the actual obstacle or the required route shift.
2. Inserting the elbows into the adjoining components all the way to the stop, checking the seating of the rubber sealing rings at both ends of each elbow.
3. Ensuring mechanical support (with spacer brackets) around both elbows, especially if there is a longer straight section between them.
4. Checking that the required route slope (min. 3°) is maintained even after inserting the elbows, since the lateral offset can affect the smooth drainage of condensate if not executed correctly.
5. Visual inspection of the tightness of all joints after completing the installation.

Compatibility

The 45° elbow Ø130 mm is fully compatible with the entire range of Vaillant flue accessories of the same diameter - straight extensions (1.0 m and 2.0 m), the sharper 87° elbow, gentler elbows (30°, 15°), the inspection T-piece, spacer brackets, as well as connection and extension sets (S1, S2, S3). Thanks to the unified push-fit joint system, the components can be freely combined according to the needs of a specific installation.

Flow dynamics of gentle elbows

An elbow with a 45° angle offers lower local resistance to the flow of flue gases than an elbow with the sharper 87° angle, since the change in flow direction is more gradual. This feature is particularly advantageous on routes where multiple changes of direction are needed and it is desirable to keep the overall pressure loss of the flue gas path within reasonable limits with regard to the output of the boiler's flue gas fan. When designing a more complex route with a combination of elbows of different angles, we recommend consulting the total equivalent length of the route (including the contribution of each elbow) with a designer, so that it remains within the limits specified by the boiler manufacturer.

Maintenance

As part of regular inspections of the flue gas path (carried out by an authorised chimney sweep), it is advisable to check the tightness of the joints on both elbows, the clear passage of the internal space at the bend, and the mechanical fixing of the adjacent straight section between the elbows, if used. The material (PP) is resistant to condensate and does not corrode, so the main subject of inspection remains the condition of the sealing elements and the mechanical stability of the assembly. The recommended inspection frequency corresponds to the applicable legislation on regular inspections of flue gas paths, generally at least once a year for gas appliances, with the exact interval determined by an authorised chimney sweep according to the type of fuel, the output of the appliance, and the specific configuration of the flue gas path.

Why choose an original Vaillant component

The precision of the bend angle and the quality of the sealing elements are particularly important when combining two elbows one after another - any inaccuracy could accumulate and affect both the resulting direction and the tightness of the entire assembly. The original Vaillant elbow is manufactured with a precision that guarantees reliable operation even in this type of combined use, unlike universal alternative components with less certain manufacturing precision.

Frequently Asked Questions

The entire Vaillant Ø130 mm flue system - where this elbow fits in

The 45° elbow is part of a complete range of Vaillant Ø130 mm flue accessories, which also includes straight extensions (1.0 m and 2.0 m), the sharper 87° elbow (sold in packs of 1 piece), gentler elbows of 30° and 15° (both also packed in pairs), an inspection T-piece with an inspection and cleaning opening, spacer brackets for mechanical fixing of the pipe, as well as connection sets for connecting to the boiler (S1, S2, or with a Ø150/130 mm reducer for ecoCRAFT boilers) and an extension set S3 for cascade connection of additional boilers. Thanks to the unified diameter and push-fit joint system, these components can be freely combined to assemble a complete flue gas path exactly according to the layout of a specific boiler room.

Practical example of use in a cascade boiler room

In cascade installations, where several boilers are connected to a common collecting route using extension sets (e.g. S3), 45° elbows are commonly used to finely align the route when connecting individual boilers to a common collecting manifold, which is not always exactly aligned with the outlet of each individual boiler. In such a case, a pair of 45° elbows makes it possible to elegantly "bypass" a slight height or lateral difference between the boiler outlet and the axis of the collecting route, without the need to use the sharper 87° elbow, which could cause unnecessarily high local flow resistance over the short distance between the boiler and the collecting route.

Ordering for service and installation companies

Like the 87° elbow, 45° elbows are among the components commonly kept in stock by heating and service companies carrying out the installation or servicing of Vaillant flue systems. Given that they are generally used in pairs, it is advisable to plan stock by ordering whole packs (2 pcs), not individual pieces, since a separate purchase of a single piece outside the pack is not a standard option in the manufacturer's catalogue.

Standards and legislation

The installation of elbows and the entire flue gas path must comply with the applicable standards (STN 73 4201, STN EN 1856, STN EN 14471) and be carried out by a professionally competent person, with subsequent inspection by an authorised chimney sweep before the boiler is put into operation.

Condensate when creating a lateral offset in the route

When creating a lateral offset using a pair of 45° elbows, increased attention must be paid to maintaining the correct slope on the inserted straight section between the two elbows. Although the main purpose of this configuration is a lateral shift of the route (not a change in height level), in practice it is almost always combined with a slight rise or fall needed to maintain the prescribed slope (min. 3°) for smooth condensate drainage towards the nearest drainage point. When designing this part of the route, we recommend thinking in advance about which direction (up/down) the offset will be implemented, so that the resulting route meets the slope requirements throughout its entire course, not only on the straight sections before and after the pair of elbows.

Comparison with an alternative solution using one sharper elbow

Some installation situations can theoretically be solved either with a pair of 45° elbows with a short straight section between them, or with a combination of other components with a similar resulting effect. The advantage of using a pair of 45° elbows instead of one sharper solution is a smoother change of direction with lower local resistance at each individual bend point, which is particularly advantageous on longer routes with multiple changes of direction, where the overall pressure loss adds up. The disadvantage is a somewhat greater overall length needed to implement the offset (due to the two elbows and the straight section between them) compared to a single, more compact solution. We recommend consulting the choice between the individual approaches with a designer according to the specific spatial possibilities at the installation site.

Storage and handling

Before installation, we recommend storing the elbows in a dry environment protected from direct sunlight and mechanical damage to the sealing surfaces. When handling both pieces, take care to protect the shaped body from impact, which could affect the precision of the bend angle.

Why shape precision is particularly important for this component

Since 45° elbows are most often used in pairs, any manufacturing inaccuracy in the angle could be multiplied when combining two pieces and lead to a resulting route direction different from the intended design - for example, when trying to return the route exactly to the original direction of continuation after a lateral offset. Original Vaillant components are manufactured with a precision that guarantees predictable behaviour even in this type of combined use, which is one of the main reasons why it is particularly not recommended to opt for cheaper non-original alternatives of unknown origin for this specific type of component.

Summary

The 45° elbow Ø130 mm (pack of 2 pcs) is a versatile component of the Vaillant flue system, particularly suitable for creating a lateral offset in the route around an obstacle, or for splitting a larger change of direction into two gentler bends. In combination with other components of the range (extensions, sharper and gentler elbows, T-piece, connection and extension sets, spacer brackets), it allows the assembly of a complete flue gas path exactly according to the layout of the boiler room. We recommend purchasing only original Vaillant components, planning the configuration in advance according to the actual layout of the space, and entrusting the installation to a professionally competent and duly authorised person, with subsequent inspection of the tightness and functionality of the entire flue gas path by an authorised chimney sweep before the boiler is put into operation and as part of regular inspections throughout its entire service life.