The Ariston Vertical Flue Kit — 100mm Leisure Bundle pairs the Vertical Starter (Part No. 3318079) with the 100mm Terminal Vertical Flue Kit (Part No. 3319235) to provide a complete vertical coaxial flue assembly specifically suited to static caravans, holiday lodges, and park homes. Together they form the full boiler-to-roof termination without needing any further flue components for a standard installation. The 3319235 uses a 100mm-diameter terminal — not the 125mm terminal found on standard domestic Ariston vertical flue kits — making it the correct replacement choice wherever the existing roof penetration was made for an older Morco or Worcester Bosch leisure boiler. No roof structural work is required on a changeover: the 100mm terminal passes straight through the existing 100mm aperture and cowl. Compatible with the Ariston E-Combi ONE 24 kW (3301131) and 30 kW (3301132), and with the broader Ariston HE ONE Series boiler range.
1240 mm
Flue Kit Total Length
575 mm
Usable Flue Length
Ø60/100
Coaxial Pipe Diameter
Push-fit
No Clamps Required
⚠ Gas Safe Registered Installer Required: This flue assembly must be installed and inspected by a Gas Safe registered engineer in compliance with the Gas Safety (Installation and Use) Regulations 1998, current Building Regulations, and BS 5440-1:2008. This requirement applies equally to static caravans, holiday lodges, and park homes as to permanent dwellings.
⚠ 100mm Terminal Only — Not the Standard Domestic Kit: The 3319235 uses a 100mm-diameter roof terminal. The standard Ariston domestic vertical flue kits — 3318080 (black terminal) and 3318081 (red terminal) — both use a 125mm terminal. These sizes are not interchangeable. Order this bundle only where a 100mm roof aperture and cowl are already in place, or where a 100mm-rated flashing will be fitted. If your installation requires a 125mm domestic terminal, order 3318079 + 3318080 or 3318081 instead.
⚠ Roof Flashing Not Included — Measure Before Ordering: No roof cowl or flashing is supplied with this bundle. The existing 100mm aperture and weatherproofing must be in serviceable condition, or a suitable 100mm-rated leisure cowl or flashing must be sourced separately from a caravan or leisure heating specialist. Standard Ariston domestic flat-roof and pitched-roof flashings (3318011, 3318009, 3318010) are sized for the 125mm terminal and will not seal correctly on the 100mm terminal in this kit.
ℹ What's Included in This Bundle:
-
Vertical Starter — Part No. 3318079: clamps to the boiler's exhaust manifold; provides the push-fit Ø60/100 socket into which the flue kit seats above
-
Vertical Flue Kit — Part No. 3319235: Ø60/100 coaxial concentric pipe with 100mm black terminal cap; 1240mm total length, 575mm usable; push-fit connection to starter below
Together these two parts form the complete boiler-to-roof flue assembly for a standard leisure installation. No additional flue components are required for a normal run within the 575mm usable height — add Ø60/100 extension pipes (3318078 or 3318077) between the starter and the kit only where the ceiling-to-roof dimension exceeds the usable length.
100mm Terminal — Drop-in Replacement for Morco and Worcester Bosch
Older Morco leisure boilers and certain Worcester Bosch models used in caravans and park homes left 100mm roof penetrations as standard. The 3319235 terminal is designed to pass directly through these existing openings, allowing a full boiler changeover to an Ariston E-Combi ONE without any roof or ceiling structural work — a significant time and cost saving on managed holiday parks replacing multiple units.
Complete Assembly — Nothing Else Needed for a Standard Run
The 3318079 starter and 3319235 flue kit together form the complete vertical flue assembly from boiler manifold to roof terminal. Unlike the domestic vertical kits where the starter and terminal kit are always sold separately, this bundle is the single order that covers a standard leisure installation — provided the usable 575mm height is sufficient for the ceiling-to-roof dimension at the installation point.
Coaxial — Single Roof Penetration
The Ø60/100 concentric coaxial design carries combustion gas exhaust through the inner pipe while drawing fresh combustion air back into the boiler through the outer annulus — all through a single 100mm roof opening. This is both structurally simpler than twin-pipe systems and minimises the weatherproofing requirement to one sealed penetration point.
Push-fit Throughout — Fast Site Assembly
Both the starter-to-boiler clamp and the push-fit joint between starter and flue kit use integral lip seals — no external clamps, no sealant, no specialist tooling required. Ensure the lip seal is correctly seated before pushing each joint home. On a holiday park changeover where multiple units are being done in sequence, this meaningfully reduces per-unit installation time.
Extendable if Needed
Where the ceiling-to-roof dimension exceeds the 575mm usable length, standard Ariston Ø60/100 coaxial extension pipes — 500mm (3318078) or 1000mm (3318077) — can be inserted between the vertical starter and the 3319235 flue kit to increase total height. The maximum permissible vertical run is 8 metres (24 kW boiler) or 7 metres (30 kW boiler). Do not cut the 3319235 terminal kit itself.
Compatible Across the Ariston HE ONE Series
This flue bundle is not limited to the E-Combi ONE — it is compatible with the full Ariston HE ONE Series including the Clas ONE, Genus ONE, Alteas ONE, and Alteas ONE+ NET wherever a 100mm leisure vertical flue is the correct route. The 3318079 vertical starter is the same part number across all these boilers; only the permitted maximum flue run varies by boiler output.
| Bundle Specifications — 3318079 + 3319235 |
| Parameter |
Detail |
| Bundle Contents |
Vertical Starter 3318079 + Vertical Flue Kit 3319235 |
| Flue System |
HE Ø60/100 mm coaxial (concentric) |
| Orientation |
Vertical — through ceiling and roof |
| Terminal Diameter |
100 mm — leisure/caravan; fits Morco & Worcester Bosch legacy 100mm apertures |
| Terminal Colour |
Black |
| Flue Kit Total Length (3319235) |
1240 mm |
| Usable Flue Length |
575 mm (varies slightly with cowl/flashing type) |
| Connection — Boiler |
3318079 clamps to boiler exhaust manifold |
| Connection — Flue Joints |
Push-fit with lip seal — no sealant or clamps required |
| Domestic Equivalent |
3318079 + 3318080 (125mm black) or 3318079 + 3318081 (125mm red) — not this bundle
|
| Max Vertical Run — E-Combi ONE 24 kW |
8 m on Ø60/100 — see installation manual for elbow deductions |
| Max Vertical Run — E-Combi ONE 30 kW |
7 m on Ø60/100 — see installation manual for elbow deductions |
| Compatible Boiler Ranges |
E-Combi ONE 24/30, Clas ONE, Clas System ONE, Genus ONE, Alteas ONE, Alteas ONE+ NET, E-System ONE |
| Typical Application |
Static caravans, holiday lodges, park homes — replacement for Morco or Worcester Bosch leisure boilers with existing 100mm roof aperture |
| Roof Flashing Included |
No — existing 100mm cowl/aperture must be serviceable; source 100mm leisure flashing separately if required |
| Extension Accessories |
3318078 (500mm), 3318077 (1000mm) — insert between 3318079 starter and 3319235 kit if additional height needed |
Frequently Asked Questions
Why is the 100mm terminal used in leisure installations rather than the standard 125mm?
The leisure boiler market historically used smaller roof penetrations. Morco leisure boilers and several Worcester Bosch compact models fitted to static caravans used 100mm-diameter roof cowls and flashings as standard. The 3319235 is sized specifically to pass through these existing openings, allowing a direct boiler changeover without disturbing the roof structure, resealing around a larger aperture, or sourcing a new flashing. For domestic premises with standard 125mm flashings, use the 3318080 or 3318081 kits instead.
Is the vertical starter (3318079) the same part used in the domestic vertical kits?
Yes — the 3318079 Vertical Starter is identical whether it is paired with the domestic 125mm flue kits (3318080, 3318081) or the leisure 100mm kit (3319235). The starter attaches to the boiler manifold and provides a push-fit Ø60/100 socket above — it has no knowledge of which terminal kit sits above it. Only the terminal diameter at the roof differs between the leisure and domestic configurations.
The ceiling-to-roof dimension at the installation point is greater than 575mm — what do I do?
Insert a Ø60/100 coaxial extension pipe between the 3318079 Vertical Starter and the base of the 3319235 kit: 3318078 (500mm) adds half a metre, 3318077 (1000mm) adds a full metre. Multiple extensions can be stacked within the maximum permissible run for the boiler in use. Do not cut the 3319235 terminal kit to accommodate a shorter dimension — it is fixed length to ensure the correct terminal clearance above the roof surface. Only extension pipes may be trimmed.
Can I use standard Ariston domestic flashings (3318009, 3318010, 3318011) with this kit?
No. The Ariston domestic flashings are all sized for the 125mm terminal used on the 3318080 and 3318081 kits. The 3319235 has a 100mm terminal — the domestic flashings will not seal around it. For a new-build or refurbished site where no existing flashing is in place, source a 100mm cowl or flashing rated for the leisure sector from a caravan or park home heating specialist. The aperture geometry must be confirmed before ordering.
What is the correct installation sequence for this bundle?
- Install and commission the boiler on the wall bracket.
- Confirm the 100mm roof aperture and cowl are in serviceable condition (or fit a new 100mm leisure cowl/flashing if required).
-
Clamp the 3318079 Vertical Starter to the boiler exhaust manifold — ensure the clamp is fully tightened and the seal is seated correctly.
- If extensions are required, push each 3318077/3318078 extension into the starter socket above, confirming each lip seal is engaged.
-
Pass the 3319235 flue kit up through the ceiling aperture and roof cowl from below.
- Push the base of the 3319235 into the starter (or topmost extension) socket and confirm the push-fit joint is fully home before securing any ceiling and roof fixings.
This kit is for a holiday park with multiple caravans — is there a bulk or trade price available?
For trade or multi-unit orders, please contact our team directly — we regularly supply holiday parks, leisure operators, and gas contractors replacing multiple leisure boilers across a site. We can quote per-unit pricing on boiler and flue bundles together and advise on the correct specification across different caravan and lodge types on the same park.
