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Ariston 45 Degree Coaxial Elbow Pack of 2 — 60/100mm SE Flue Bend Next Evo X 11 LPG 16 Natural Gas
Ariston 45 Degree Coaxial Elbow Pack of 2 — 60/100mm SE Flue Bend Next Evo X 11 LPG 16 Natural Gas
The Ariston 45 Degree Coaxial Elbow (MPN 3318004) is a genuine Ariston flue accessory for the 60/100mm SE coaxial flue system, supplied as a pack of two elbows. Used to introduce a 45° directional change into the flue run — individually to navigate a single-plane offset, or used as a pair to achieve a full 90° direction change via two sequential bends. Compatible with the Ariston Next Evo X 11 LPG (3632535) and Next Evo X 16 Natural Gas (3632533) gas instantaneous water heaters and the wider Ariston 60/100mm SE coaxial accessory range. Using a pair of 45° bends in place of a single 90° elbow (3318003) creates a more gradual direction change with lower flow resistance, which is the preferred approach where the flue run permits. Each elbow deducts from the maximum permissible total equivalent flue length — consult the Ariston Next Evo X installation manual's flue duct length table before specifying.
⚠ Gas Safe Installation Required — Next Evo X Range Only — All flue components must be installed by a Gas Safe registered engineer in accordance with the Ariston installation manual, Gas Safety (Installation and Use) Regulations 1998, and Building Regulations Part J. Flue accessories must only be used with compatible Ariston appliances and within the maximum permissible flue lengths stated in the appliance installation manual.
ℹ 45° Pair vs Single 90° Elbow — Which Should You Use?
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
45°
Per elbow
Pack of 2
Supplied as pair
60/100mm
SE coaxial
Genuine
Ariston OEM
Features & Benefits
✔ Genuine Ariston — Guaranteed Fit
Using genuine Ariston OEM flue components is essential for warranty validity, Gas Safe compliance, and safe appliance operation. The 3318004 elbows are engineered specifically for the 60/100mm SE coaxial system, with the correct internal bore geometry, gasket seating dimensions, and material specification to match the appliance's combustion fan pressure and flue gas temperature range. Third-party 45° bends designed for other manufacturers' systems may have different internal diameters or sealing arrangements that impair combustion performance or create CO risks.
✔ Enables Flexible Flue Routing
In many installations the straight-through route from the appliance to the external wall is obstructed by a joist, a doorframe, a cupboard structure, or a structural beam. The 45° elbow pair allows the flue run to step around a single obstruction — offsetting the flue horizontally or vertically in two bends before continuing in a straight run to the terminal. Combined with extensions (3318005, 3318006), multiple offsets can be accommodated within the maximum permissible equivalent flue length stated in the Ariston installation manual.
✔ Lower Resistance Than 90° Bend
Each 45° elbow introduces less pressure drop than a 90° elbow because the airflow and flue gas stream make a more gradual directional change — reducing turbulence and separation losses at the bend. In longer flue runs where the total equivalent length is close to the appliance's maximum, using a pair of 45° bends instead of a single 90° elbow can be the difference between a compliant and non-compliant flue route. The equivalent pipe length deduction per 45° bend is specified in the appliance installation manual's flue table.
✔ Full SE Accessory System Compatibility
The 3318004 elbows connect directly to all other Ariston 60/100mm SE coaxial flue components: the standard horizontal flue kit (3319648), the 90° elbow (3318003), the 1m extension (3318005), the 0.5m extension (3318006), the vertical starter (3318008), and the wall bracket kit (3318015). This allows the installer to build a complete custom flue route from a kit of standard parts without site fabrication, maintaining the sealed coaxial air/flue separation throughout.
Specifications — Ariston 45° Coaxial Elbow Pair (3318004)
| MPN | 3318004 |
| Description | 45° coaxial flue elbow — standard efficiency (SE) |
| Pack Contents | 2 × 45° elbows |
| Flue System | 60/100mm coaxial — SE (Standard Efficiency) |
| Compatible Appliances | Ariston Next Evo X 11 LPG (3632535) · Ariston Next Evo X 16 Natural Gas (3632533) |
| Compatible Accessories | 3319648 horizontal flue kit · 3318003 90° elbow · 3318005 1m extension · 3318006 0.5m extension · 3318008 vertical starter · 3318015 bracket kit · 3318855 vertical flue with black terminal |
| Brand | Ariston (genuine OEM) |
Frequently Asked Questions
How much does each 45° bend reduce the maximum permissible flue length?
The exact equivalent pipe length deduction per 45° elbow is specified in the Ariston Next Evo X installation manual's flue duct length table. As a general principle for coaxial flue systems, a 45° bend is typically equivalent to approximately 0.5–1 metre of straight pipe in terms of resistance — significantly less than a 90° elbow (typically equivalent to ~1–2m). The maximum permissible total equivalent flue length for the Next Evo X varies depending on whether the configuration is horizontal or vertical — always refer to the installation manual and calculate the total equivalent length before finalising the flue route. Exceeding the maximum equivalent length can impair combustion and compromise safety.
Can I use just one of the two elbows and keep the other as a spare?
Yes — both elbows in the pack are identical, so if your installation only requires a single 45° direction change you can use one elbow and retain the second for future modifications or service. However, most installations that require a 45° offset benefit from using both elbows as a symmetrical offset pair — the first bending the flue off-axis, an extension carrying it across the obstruction, and the second returning it to the original axis. This is the standard approach for stepping around a structural element while maintaining the overall flue direction toward the terminal.
Is this the same as the 45° elbow for Ariston boilers (non-water heater)?
Not necessarily — Ariston produces different flue accessory ranges for different product families, and part numbers differ between them. The 3318004 is specifically for the Next Evo X water heater range (the SE system). Ariston boilers (E-Combi, E-System, Clas, Alteas, etc.) use different flue systems and part numbers even when the physical pipe diameter appears similar. Always match the flue accessory MPN to the specific appliance model and the installation manual's approved accessories list. Using a flue accessory from the wrong range can result in incorrect sealing, air leakage into the flue gas stream, or flue gas leakage into the room.
Do I need any additional seals or fixings when fitting these elbows?
The coaxial elbow joints in the Ariston SE system use integral push-fit or twist-lock connections with built-in gaskets — no additional PTFE tape, mastic, or separate seals are required at the elbow joints themselves. The gaskets are pre-fitted to the pipe sockets. However, if the elbows are fitted within a building void or concealed space, the installer should confirm all joints are correctly seated and locked before concealing the flue run — access for future inspection should be maintained where possible. Wall bracket clips (3318015) should be used to support the flue at appropriate intervals per the installation manual's guidance.
$25.51
Original: $72.88
-65%Ariston 45 Degree Coaxial Elbow Pack of 2 — 60/100mm SE Flue Bend Next Evo X 11 LPG 16 Natural Gas—
$72.88
$25.51Ariston 45 Degree Coaxial Elbow Pack of 2 — 60/100mm SE Flue Bend Next Evo X 11 LPG 16 Natural Gas
The Ariston 45 Degree Coaxial Elbow (MPN 3318004) is a genuine Ariston flue accessory for the 60/100mm SE coaxial flue system, supplied as a pack of two elbows. Used to introduce a 45° directional change into the flue run — individually to navigate a single-plane offset, or used as a pair to achieve a full 90° direction change via two sequential bends. Compatible with the Ariston Next Evo X 11 LPG (3632535) and Next Evo X 16 Natural Gas (3632533) gas instantaneous water heaters and the wider Ariston 60/100mm SE coaxial accessory range. Using a pair of 45° bends in place of a single 90° elbow (3318003) creates a more gradual direction change with lower flow resistance, which is the preferred approach where the flue run permits. Each elbow deducts from the maximum permissible total equivalent flue length — consult the Ariston Next Evo X installation manual's flue duct length table before specifying.
⚠ Gas Safe Installation Required — Next Evo X Range Only — All flue components must be installed by a Gas Safe registered engineer in accordance with the Ariston installation manual, Gas Safety (Installation and Use) Regulations 1998, and Building Regulations Part J. Flue accessories must only be used with compatible Ariston appliances and within the maximum permissible flue lengths stated in the appliance installation manual.
ℹ 45° Pair vs Single 90° Elbow — Which Should You Use?
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
45°
Per elbow
Pack of 2
Supplied as pair
60/100mm
SE coaxial
Genuine
Ariston OEM
Features & Benefits
✔ Genuine Ariston — Guaranteed Fit
Using genuine Ariston OEM flue components is essential for warranty validity, Gas Safe compliance, and safe appliance operation. The 3318004 elbows are engineered specifically for the 60/100mm SE coaxial system, with the correct internal bore geometry, gasket seating dimensions, and material specification to match the appliance's combustion fan pressure and flue gas temperature range. Third-party 45° bends designed for other manufacturers' systems may have different internal diameters or sealing arrangements that impair combustion performance or create CO risks.
✔ Enables Flexible Flue Routing
In many installations the straight-through route from the appliance to the external wall is obstructed by a joist, a doorframe, a cupboard structure, or a structural beam. The 45° elbow pair allows the flue run to step around a single obstruction — offsetting the flue horizontally or vertically in two bends before continuing in a straight run to the terminal. Combined with extensions (3318005, 3318006), multiple offsets can be accommodated within the maximum permissible equivalent flue length stated in the Ariston installation manual.
✔ Lower Resistance Than 90° Bend
Each 45° elbow introduces less pressure drop than a 90° elbow because the airflow and flue gas stream make a more gradual directional change — reducing turbulence and separation losses at the bend. In longer flue runs where the total equivalent length is close to the appliance's maximum, using a pair of 45° bends instead of a single 90° elbow can be the difference between a compliant and non-compliant flue route. The equivalent pipe length deduction per 45° bend is specified in the appliance installation manual's flue table.
✔ Full SE Accessory System Compatibility
The 3318004 elbows connect directly to all other Ariston 60/100mm SE coaxial flue components: the standard horizontal flue kit (3319648), the 90° elbow (3318003), the 1m extension (3318005), the 0.5m extension (3318006), the vertical starter (3318008), and the wall bracket kit (3318015). This allows the installer to build a complete custom flue route from a kit of standard parts without site fabrication, maintaining the sealed coaxial air/flue separation throughout.
Specifications — Ariston 45° Coaxial Elbow Pair (3318004)
| MPN | 3318004 |
| Description | 45° coaxial flue elbow — standard efficiency (SE) |
| Pack Contents | 2 × 45° elbows |
| Flue System | 60/100mm coaxial — SE (Standard Efficiency) |
| Compatible Appliances | Ariston Next Evo X 11 LPG (3632535) · Ariston Next Evo X 16 Natural Gas (3632533) |
| Compatible Accessories | 3319648 horizontal flue kit · 3318003 90° elbow · 3318005 1m extension · 3318006 0.5m extension · 3318008 vertical starter · 3318015 bracket kit · 3318855 vertical flue with black terminal |
| Brand | Ariston (genuine OEM) |
Frequently Asked Questions
How much does each 45° bend reduce the maximum permissible flue length?
The exact equivalent pipe length deduction per 45° elbow is specified in the Ariston Next Evo X installation manual's flue duct length table. As a general principle for coaxial flue systems, a 45° bend is typically equivalent to approximately 0.5–1 metre of straight pipe in terms of resistance — significantly less than a 90° elbow (typically equivalent to ~1–2m). The maximum permissible total equivalent flue length for the Next Evo X varies depending on whether the configuration is horizontal or vertical — always refer to the installation manual and calculate the total equivalent length before finalising the flue route. Exceeding the maximum equivalent length can impair combustion and compromise safety.
Can I use just one of the two elbows and keep the other as a spare?
Yes — both elbows in the pack are identical, so if your installation only requires a single 45° direction change you can use one elbow and retain the second for future modifications or service. However, most installations that require a 45° offset benefit from using both elbows as a symmetrical offset pair — the first bending the flue off-axis, an extension carrying it across the obstruction, and the second returning it to the original axis. This is the standard approach for stepping around a structural element while maintaining the overall flue direction toward the terminal.
Is this the same as the 45° elbow for Ariston boilers (non-water heater)?
Not necessarily — Ariston produces different flue accessory ranges for different product families, and part numbers differ between them. The 3318004 is specifically for the Next Evo X water heater range (the SE system). Ariston boilers (E-Combi, E-System, Clas, Alteas, etc.) use different flue systems and part numbers even when the physical pipe diameter appears similar. Always match the flue accessory MPN to the specific appliance model and the installation manual's approved accessories list. Using a flue accessory from the wrong range can result in incorrect sealing, air leakage into the flue gas stream, or flue gas leakage into the room.
Do I need any additional seals or fixings when fitting these elbows?
The coaxial elbow joints in the Ariston SE system use integral push-fit or twist-lock connections with built-in gaskets — no additional PTFE tape, mastic, or separate seals are required at the elbow joints themselves. The gaskets are pre-fitted to the pipe sockets. However, if the elbows are fitted within a building void or concealed space, the installer should confirm all joints are correctly seated and locked before concealing the flue run — access for future inspection should be maintained where possible. Wall bracket clips (3318015) should be used to support the flue at appropriate intervals per the installation manual's guidance.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Ariston 45 Degree Coaxial Elbow (MPN 3318004) is a genuine Ariston flue accessory for the 60/100mm SE coaxial flue system, supplied as a pack of two elbows. Used to introduce a 45° directional change into the flue run — individually to navigate a single-plane offset, or used as a pair to achieve a full 90° direction change via two sequential bends. Compatible with the Ariston Next Evo X 11 LPG (3632535) and Next Evo X 16 Natural Gas (3632533) gas instantaneous water heaters and the wider Ariston 60/100mm SE coaxial accessory range. Using a pair of 45° bends in place of a single 90° elbow (3318003) creates a more gradual direction change with lower flow resistance, which is the preferred approach where the flue run permits. Each elbow deducts from the maximum permissible total equivalent flue length — consult the Ariston Next Evo X installation manual's flue duct length table before specifying.
⚠ Gas Safe Installation Required — Next Evo X Range Only — All flue components must be installed by a Gas Safe registered engineer in accordance with the Ariston installation manual, Gas Safety (Installation and Use) Regulations 1998, and Building Regulations Part J. Flue accessories must only be used with compatible Ariston appliances and within the maximum permissible flue lengths stated in the appliance installation manual.
ℹ 45° Pair vs Single 90° Elbow — Which Should You Use?
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
A pair of 45° bends (3318004) achieves the same 90° total direction change as a single 90° elbow (3318003), but with a more gradual sweep — reducing turbulence in the airflow and flue gas stream, which slightly lowers the pressure drop across the bend compared to a sharp 90°. This is particularly beneficial in longer flue runs where total resistance must be minimised. The trade-off is that two 45° bends consume more linear flue length than a single 90°. Where installation space is very limited, the single 90° elbow is the more compact option.
45°
Per elbow
Pack of 2
Supplied as pair
60/100mm
SE coaxial
Genuine
Ariston OEM
Features & Benefits
✔ Genuine Ariston — Guaranteed Fit
Using genuine Ariston OEM flue components is essential for warranty validity, Gas Safe compliance, and safe appliance operation. The 3318004 elbows are engineered specifically for the 60/100mm SE coaxial system, with the correct internal bore geometry, gasket seating dimensions, and material specification to match the appliance's combustion fan pressure and flue gas temperature range. Third-party 45° bends designed for other manufacturers' systems may have different internal diameters or sealing arrangements that impair combustion performance or create CO risks.
✔ Enables Flexible Flue Routing
In many installations the straight-through route from the appliance to the external wall is obstructed by a joist, a doorframe, a cupboard structure, or a structural beam. The 45° elbow pair allows the flue run to step around a single obstruction — offsetting the flue horizontally or vertically in two bends before continuing in a straight run to the terminal. Combined with extensions (3318005, 3318006), multiple offsets can be accommodated within the maximum permissible equivalent flue length stated in the Ariston installation manual.
✔ Lower Resistance Than 90° Bend
Each 45° elbow introduces less pressure drop than a 90° elbow because the airflow and flue gas stream make a more gradual directional change — reducing turbulence and separation losses at the bend. In longer flue runs where the total equivalent length is close to the appliance's maximum, using a pair of 45° bends instead of a single 90° elbow can be the difference between a compliant and non-compliant flue route. The equivalent pipe length deduction per 45° bend is specified in the appliance installation manual's flue table.
✔ Full SE Accessory System Compatibility
The 3318004 elbows connect directly to all other Ariston 60/100mm SE coaxial flue components: the standard horizontal flue kit (3319648), the 90° elbow (3318003), the 1m extension (3318005), the 0.5m extension (3318006), the vertical starter (3318008), and the wall bracket kit (3318015). This allows the installer to build a complete custom flue route from a kit of standard parts without site fabrication, maintaining the sealed coaxial air/flue separation throughout.
Specifications — Ariston 45° Coaxial Elbow Pair (3318004)
| MPN | 3318004 |
| Description | 45° coaxial flue elbow — standard efficiency (SE) |
| Pack Contents | 2 × 45° elbows |
| Flue System | 60/100mm coaxial — SE (Standard Efficiency) |
| Compatible Appliances | Ariston Next Evo X 11 LPG (3632535) · Ariston Next Evo X 16 Natural Gas (3632533) |
| Compatible Accessories | 3319648 horizontal flue kit · 3318003 90° elbow · 3318005 1m extension · 3318006 0.5m extension · 3318008 vertical starter · 3318015 bracket kit · 3318855 vertical flue with black terminal |
| Brand | Ariston (genuine OEM) |
Frequently Asked Questions
How much does each 45° bend reduce the maximum permissible flue length?
The exact equivalent pipe length deduction per 45° elbow is specified in the Ariston Next Evo X installation manual's flue duct length table. As a general principle for coaxial flue systems, a 45° bend is typically equivalent to approximately 0.5–1 metre of straight pipe in terms of resistance — significantly less than a 90° elbow (typically equivalent to ~1–2m). The maximum permissible total equivalent flue length for the Next Evo X varies depending on whether the configuration is horizontal or vertical — always refer to the installation manual and calculate the total equivalent length before finalising the flue route. Exceeding the maximum equivalent length can impair combustion and compromise safety.
Can I use just one of the two elbows and keep the other as a spare?
Yes — both elbows in the pack are identical, so if your installation only requires a single 45° direction change you can use one elbow and retain the second for future modifications or service. However, most installations that require a 45° offset benefit from using both elbows as a symmetrical offset pair — the first bending the flue off-axis, an extension carrying it across the obstruction, and the second returning it to the original axis. This is the standard approach for stepping around a structural element while maintaining the overall flue direction toward the terminal.
Is this the same as the 45° elbow for Ariston boilers (non-water heater)?
Not necessarily — Ariston produces different flue accessory ranges for different product families, and part numbers differ between them. The 3318004 is specifically for the Next Evo X water heater range (the SE system). Ariston boilers (E-Combi, E-System, Clas, Alteas, etc.) use different flue systems and part numbers even when the physical pipe diameter appears similar. Always match the flue accessory MPN to the specific appliance model and the installation manual's approved accessories list. Using a flue accessory from the wrong range can result in incorrect sealing, air leakage into the flue gas stream, or flue gas leakage into the room.
Do I need any additional seals or fixings when fitting these elbows?
The coaxial elbow joints in the Ariston SE system use integral push-fit or twist-lock connections with built-in gaskets — no additional PTFE tape, mastic, or separate seals are required at the elbow joints themselves. The gaskets are pre-fitted to the pipe sockets. However, if the elbows are fitted within a building void or concealed space, the installer should confirm all joints are correctly seated and locked before concealing the flue run — access for future inspection should be maintained where possible. Wall bracket clips (3318015) should be used to support the flue at appropriate intervals per the installation manual's guidance.
