The Ariston E-Combi ONE 30 kW Condensing Combi Gas Boiler (Part No. 3301132) paired with the 100mm Vertical Flue Kit (Part No. 3319235) and Vertical Starter (Part No. 3318079) is the higher-output version of the popular E-Combi ONE leisure pack, designed for larger static caravans, holiday lodges, and park homes that need the additional domestic hot water and heating capacity of a 30 kW boiler. Like the 24 kW variant, it uses the 3319235 100mm-terminal vertical flue kit — the specialist leisure-market flue that fits existing 100mm roof penetrations left by older Morco and Worcester Bosch boilers, eliminating any need to disturb the roof structure on a changeover. Backed by Ariston's patented XtraTech™ stainless steel heat exchanger, 94% seasonal efficiency, and a 1:7 modulation ratio, the 30 kW model delivers a 12.5 l/min DHW flow rate — meaningfully better than the 24 kW unit for properties with two shower rooms or higher simultaneous hot water demand. The LPG conversion kit is included as standard, making it directly suitable for sites on bottled propane.
1240 mm
Total Flue Kit Length
⚠ Gas Safe Registered Installer Required: This boiler must be installed and commissioned by a Gas Safe registered engineer in accordance with the Gas Safety (Installation and Use) Regulations 1998, current Building Regulations, and BS 5440-1:2008. This applies equally to holiday homes, park homes, and leisure properties as to permanent dwellings.
⚠ Not the Standard Domestic Flue Kit — 100mm Terminal Only: The 3319235 uses a 100mm-diameter terminal, not the 125mm terminal found on the standard Ariston domestic vertical flue kits (3318080 / 3318081). These sizes are not interchangeable. This kit is correct only where a 100mm roof opening already exists or where a compact 100mm cowl will be fitted. If you need a 125mm terminal for a domestic installation, order the 3318080 (black) or 3318081 (red) instead.
ℹ What's Included in This Pack:
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Ariston E-Combi ONE 30 kW Combi Boiler — Part No. 3301132
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Vertical Starter — Part No. 3318079 (clamps to boiler exhaust manifold; push-fit to flue kit above)
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Vertical Flue Kit — 100mm Black Terminal — Part No. 3319235 (Ø60/100 concentric, 1240 mm total, 575 mm usable)
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LPG Conversion Kit — included as standard (essential for bottled-gas holiday home sites)
Not included: Roof flashing / terminal cowl (must suit your existing 100mm roof penetration — do not use standard Ariston 125mm domestic flashings), flue support brackets (3318015 recommended per extension), and any additional Ø60/100 extension pipes if the ceiling height requires them.
⚠ 24 kW vs 30 kW — Choosing the Right Output: The 30 kW model produces a 12.5 l/min DHW flow rate versus 10.4 l/min on the 24 kW — a 20% improvement that is meaningful on properties with two bathrooms or a shower and bath running simultaneously. For lodges and larger static caravans with more than one wet room, or with a higher radiator count, the 30 kW is the appropriate choice. For a single-bathroom caravan with up to 8–10 radiators, the 24 kW (3301131) pack is sufficient and more economical to run at part load.
100mm Terminal — Legacy Flashing Compatible
The 3319235 uses a 100mm-diameter terminal purpose-built for the leisure market, where Morco and Worcester Bosch boilers historically used 100mm roof penetrations. Replacing either brand on an existing site with this pack requires no roof or ceiling structural work — the terminal passes through the existing aperture and cowl, making changeover faster and cheaper on a managed holiday park with multiple units.
30 kW — Higher DHW Output for Larger Lodges
The step from 24 kW to 30 kW increases maximum DHW heat output from 26 kW to 30 kW and flow rate from 10.4 to 12.5 l/min at ΔT35°C. For a holiday lodge with two shower rooms, or a large static caravan where guests frequently use the bathroom simultaneously, this difference prevents the flow temperature drop and reduced pressure that a 24 kW unit would experience under peak demand.
XtraTech™ Stainless Steel Heat Exchanger
Ariston's patented single-coil XtraTech™ stainless steel heat exchanger features wider waterways than conventional copper alternatives, improving long-term resistance to limescale and corrosion — important on leisure properties where water treatment may not be as consistently maintained as in a permanent domestic system, and where the boiler may stand idle between letting seasons.
LPG Ready — Bottled Gas Site Compatible
An LPG conversion kit is included as standard in every E-Combi ONE box. The conversion to propane (G31) is completed at commissioning by the Gas Safe engineer with no additional parts. Holiday parks and caravan sites typically operate on bulk LPG tanks or cylinder manifolds — this boiler is ready for those setups without further hardware.
AUTO Function — Efficiency Without User Input
The AUTO function continuously monitors heating system behaviour and automatically adjusts boiler output and pump speed to match actual demand. In holiday letting use, where occupancy varies from busy peak weeks to empty off-season periods, this prevents energy waste without requiring owners or guests to reconfigure settings between visits.
1:7 Modulation — 51 dB Quiet Operation
A 1:7 modulation ratio allows the 30 kW boiler to turn down to approximately 4.3 kW minimum output, avoiding disruptive short-cycling in well-heated spaces. At 51 dB (Band XL), audible noise is minimised — a meaningful advantage in the thin-walled construction of static caravans and lodges where mechanical noise transfers easily between rooms.
| Technical Specifications — E-Combi ONE 30 kW (3301132) |
| Parameter |
Value |
| Boiler Part Number |
3301132 |
| ErP Energy Rating |
A / A (Heating / DHW) |
| Seasonal Space Heating Efficiency |
94% |
| Water Heating Energy Efficiency |
82% |
| SAP 2009/2012 Efficiency |
89.4% |
| CH Heat Output (Max) |
28 kW |
| DHW Heat Output (Max) |
30 kW |
| DHW Flow Rate ΔT 35°C |
12.5 l/min |
| CH Temperature Range (High) |
35 – 82°C |
| CH Temperature Range (Low / UFH) |
20 – 45°C |
| DHW Temperature Range |
36 – 60°C |
| Modulation Ratio |
1:7 |
| Min DHW Flow Rate |
2 l/min |
| DHW Pressure Min / Max |
0.2 / 7.0 bar |
| Built-in Expansion Vessel |
8 litres |
| Noise Level |
51 dB / Band XL |
| NOx Emissions |
51 mg/kWh |
| Boiler Weight |
31.9 kg |
| Dimensions H × W × D |
745 × 400 × 385 mm |
| Servicing Clearances — Top / Front / Bottom |
300 / 450 / 250 mm |
| Servicing Clearances — Left / Right |
5 / 5 mm |
| Electrical Supply |
230 V / 50 Hz |
| IP Rating |
IPX5D |
| Gas Types Supported |
Natural gas (G20) and LPG propane (G31) — LPG kit included |
| 100mm Vertical Flue Kit Specifications (3319235 + 3318079) |
| Flue Terminal Part No. |
3319235 — 100mm Black Terminal (Caravan & Leisure) |
| Vertical Starter Part No. |
3318079 |
| Flue Pipe Diameter |
Ø60/100 mm coaxial (concentric exhaust / air intake) |
| Terminal Diameter |
100 mm — fits existing Morco & Worcester Bosch legacy flashings |
| Total Flue Kit Length |
1240 mm |
| Usable Flue Length |
575 mm |
| Max Vertical Flue Run — 30 kW on Ø60/100 |
7 metres total (see installation manual for elbow deductions) |
| Connection Type |
Push-fit with lip seal throughout — no clamps required on flue joints |
| Standard Domestic Equivalent |
3318080 (black, 125mm) / 3318081 (red, 125mm) — not this kit
|
| Roof Flashing |
Not included — must suit existing 100mm penetration; standard Ariston domestic flashings are 125mm and will not seal on this terminal |
Frequently Asked Questions
Why is the maximum vertical flue run 7 metres on the 30 kW rather than 8 metres on the 24 kW?
The higher output of the 30 kW burner produces a slightly greater volume of combustion gases, which increases resistance in the flue system. Ariston's published maximum vertical run for the E-Combi ONE on Ø60/100 is 8 metres at 24 kW and 7 metres at 30 kW. Each 90° elbow (3318075) deducts from these totals — refer to the installation manual for the specific deduction per fitting. If the installation requires more than 7 metres, upgrading to the Ø80/125 coaxial system supports up to 24 metres on the 30 kW model, though this requires a different starter and larger roof penetration.
Should I choose the 24 kW or 30 kW for my lodge or static caravan?
The key differentiator is hot water demand. If your property has two bathrooms or two shower rooms, or if guests frequently use hot water simultaneously, the 30 kW (3301132) is the better choice — its 12.5 l/min flow rate provides noticeably better shower performance under concurrent use than the 24 kW's 10.4 l/min. For a single-bathroom caravan or smaller lodge with one wet room, the 24 kW (3301131) is adequate and may run more efficiently at part load since it modulates to a lower minimum output proportionally.
Does the 3319235 fit the same Morco and Worcester Bosch roof flashings regardless of boiler output?
Yes. The 3319235 flue kit is identical whether paired with the 24 kW or 30 kW boiler — the terminal diameter, total length, and push-fit connections are the same in both cases. The only difference between the two packs is the boiler body itself (3301131 vs 3301132). The flue fits the same 100mm legacy roof penetrations regardless of output.
Can I extend the vertical run if the kit length isn't sufficient?
Yes. Standard Ariston Ø60/100 coaxial extension pipes — 500mm (3318078) or 1000mm (3318077) — can be inserted between the vertical starter and the 3319235 terminal kit. Keep the total run within 7 metres for the 30 kW model and account for elbow deductions as specified in the installation manual. Do not cut the 3319235 terminal kit itself — only extension pipes may be trimmed if required.
Does the boiler work on LPG for sites without mains gas?
Yes. An LPG conversion kit is included as standard in the E-Combi ONE 30 kW box. The Gas Safe engineer carries out the conversion to propane (G31) at commissioning — no additional parts are needed. The boiler is then fully compatible with bulk LPG tank or cylinder manifold supply as found on most commercial holiday parks.
Does the anti-frost protection cover the whole property?
The E-Combi ONE includes an integrated anti-frost device that activates the burner and pump automatically if the boiler's internal temperature drops to a critical level, protecting the boiler body itself. It does not protect external pipework, the wider heating circuit, or unheated areas of the property. For holiday homes left unoccupied over winter, a full system drain-down or a separate site-wide frost strategy is still recommended alongside the boiler's built-in protection.
