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| Manufacturer Part No | 3301131 |
|---|
Home > Boilers > Combi Boilers > Ariston E-Combi ONE 30kW LPG Ready Combi Boiler
Compact condensing combi boiler for homes with 2+ bathrooms. LPG conversion kit included — ready for natural gas or LPG. Patented XtraTech™ stainless steel heat exchanger. 94% ErP seasonal efficiency. 28kW CH / 30kW DHW at 12.5 l/min. 51dB quiet operation. Ariston NET smart compatible. Certified by TÜV Rheinland. 2-year manufacturer guarantee.
Achieves 94% seasonal space heating efficiency under the EU ErP Directive — the European standard all boilers are now rated against. This is among the highest figures available at this output level, meaning minimal wasted energy and lower fuel bills year-round.
Ariston’s patented single-coil design features waterways 142% wider than conventional heat exchangers. Wider channels mean less risk of debris blockage, faster heat transfer, and better corrosion resistance across a wide pH range. Certified by TÜV Rheinland.
Supplied in the box at no extra cost. Your Gas Safe engineer will fit the conversion kit during installation. Ideal for rural and off-grid properties without mains gas — connects to a propane bulk tank or large cylinders arranged with your LPG supplier.
The burner adjusts its output continuously between 4.3kW minimum and 28kW maximum to exactly match the heating demand of your home. Far less on/off cycling compared to non-modulating boilers — lower fuel bills and more even room temperatures.
Custom silencer and insulated panels keep operational noise to 51dB — quieter than a normal conversation. Suitable for installation in kitchens, utility rooms, and airing cupboards without disturbing the household.
Ready for Ariston NET smart thermostat and app control out of the box. Monitor and adjust your heating and hot water remotely from a smartphone. Also compatible with OpenTherm smart thermostats for further flexibility.
The unique AUTO function continuously monitors the boiler and heating system to optimise efficiency automatically — adjusting flow temperatures to suit actual demand rather than running at maximum temperature all the time.
At 745 x 400 x 385mm and just 31.9kg, this is one of the more compact 30kW combi boilers available. Pipework connections maintain the same positions as previous Ariston Cares ONE models — straightforward like-for-like retrofit in most cases.
All data verified against the official Ariston E-Combi ONE product datasheet (Ariston library reference 64496858) and Screwfix product page 609RX.
| Specification | E-Combi ONE 30kW |
|---|---|
| ErP Rating — Heating / Hot Water | A / A — Highest Rating |
| ErP Seasonal Space Heating Efficiency (ηs) | 94% |
| Water Heating Energy Efficiency (ηwh) | 82% |
| SEDBUK Rating | Band A |
| SAP Efficiency 2005 | 90.2% |
| SAP Efficiency 2009/2012 | 89.4% |
| ErP Tapping Profile | XL |
| NOx Emissions | 51 mg/kWh |
| Sound Power Level (indoors) | 51 dB |
| Specification | E-Combi ONE 30kW |
|---|---|
| Max CH Heat Output | 28kW |
| Max DHW Heat Output | 30kW |
| DHW Flow Rate (ΔT35°C) | 12.5 l/min |
| Modulation Ratio | 1:7 |
| CH Temperature Range (High Temp) | 35–82°C |
| CH Temperature Range (Low Temp / UFH) | 20–45°C |
| DHW Temperature Range | 36–60°C |
| Min DHW Flow Rate | 2 l/min |
| DHW Pressure — Min / Max | 0.2 bar / 7 bar |
| Specification | E-Combi ONE 30kW |
|---|---|
| Height | 745mm |
| Width | 400mm |
| Depth | 385mm |
| Weight (empty) | 31.9kg |
| Built-in Expansion Vessel | 8 litres |
| Built-in Expansion Vessel Pre-charge | 0.7 bar |
| Min Ambient Temperature | 5°C |
| Flue Connection | 100mm diameter — top outlet |
| Electrical Supply | 230V / 50Hz |
| Electrical Protection Grade | IP X5D |
| Heat Exchanger | XtraTech™ stainless steel — single coil, 142% wider waterways |
| Clearance | Required |
|---|---|
| Above boiler (top) | 300mm minimum |
| Front of boiler | 450mm minimum |
| Below boiler (bottom) | 250mm minimum |
| Left and right sides | 5mm minimum each side |
| Specification | Detail |
|---|---|
| Ariston Part No. (Natural Gas) | 3301132 |
| Ariston Part No. (LPG Factory-Set Version) | 3301446 |
| Boiler Type | Condensing Combination (Combi) — wall mounted |
| Fuel Type | Natural Gas / LPG (conversion kit included) |
| Colour | Brilliant White |
| Solar Compatible | Yes |
| Underfloor Heating Compatible | Yes — low temp range 20–45°C |
| Smart Compatible | Ariston NET (app + smart thermostat) |
| LPG Conversion Kit | Yes — included in box |
| Filling Loop | Yes — included |
| Flue Kit | Not included — sold separately (Ariston 3318073 horizontal flue) |
| Frost Protection | Yes — built in |
| Display | Large backlit LCD with pressure gauge |
| Certification | TÜV Rheinland |
| Manufacturer Guarantee | 2 Years — Ariston UK |
| Installation Requirement | Gas Safe Registered Engineer — mandatory by law |
| Model | CH Output | DHW Output | ErP Efficiency | Weight |
|---|---|---|---|---|
| E-Combi ONE 24kW | 22kW | 26kW | 94% | 29.3kg |
| E-Combi ONE 30kW THIS PRODUCT | 28kW | 30kW | 94% | 31.9kg |
24kW data from official Ariston datasheet (product code 3301131). 30kW data from official Ariston datasheet (product code 3301132 / 3301446).
The E-Combi ONE 30kW operates on natural gas or LPG (propane). The LPG conversion kit is included in the box — your Gas Safe engineer switches the gas jet and adjusts pressure settings during installation at no extra parts cost.
| LPG Key Facts | Detail |
|---|---|
| LPG Type | Propane (most common for domestic heating in UK) |
| Conversion Kit | Included in box — no additional cost |
| Tank / Supply Required | Bulk LPG storage tank or large cylinders — arrange supply with your LPG supplier before installation |
| Installation Requirement | Gas Safe registered engineer with LPG competence — mandatory |
| Suitable For | Rural homes, off-grid properties, holiday cottages, leisure properties without mains gas |
| Min Inlet Pressure | 0.2 bar — confirm supply pressure with your LPG supplier and installer |
| Boiler Type | Wall-mounted condensing combi — indoor only |
| Flue Outlet Position | Top — 100mm diameter coaxial. Flue sold separately. |
| Recommended Flue Kit | Ariston Standard Horizontal Flue Kit — part no. 3318073 |
| Dimensions (H x W x D) | 745 x 400 x 385mm |
| Weight | 31.9kg |
| Electrical Supply | 230V / 50Hz — IP X5D protection |
| Expansion Vessel | 8 litres built-in, pre-charged at 0.7 bar |
| Condensate Drain | Required — to be connected to suitable drain point |
| Compatible Systems | Sealed system only — combi boiler |
| Underfloor Heating | Compatible — low temp CH setting 20–45°C |
| Solar Compatible | Yes — solar thermal pre-plumbing available |
| Servicing Clearances | Top: 300mm / Front: 450mm / Bottom: 250mm / Sides: 5mm |
| Min DHW Pressure | 0.2 bar |
| Max DHW Pressure | 7 bar |
| Box Contents | Boiler unit + LPG conversion kit + filling loop. Flue NOT included. |
Choosing the correct boiler output is critical. Oversizing wastes energy and causes short-cycling; undersizing leaves the home poorly heated. Use this as a guide only — your Gas Safe engineer must carry out a full heat loss calculation (BS EN 12831) before installation.
| Property Type | Recommended Output | 30kW Suitable? |
|---|---|---|
| Flat / 1-bed, 1 bathroom | 18–24kW | Likely oversized — consider 24kW |
| 2–3 bed, 1 bathroom, average insulation | 24–28kW | Borderline — engineer to calculate |
| 3–4 bed, 2 bathrooms, good insulation | 28–30kW | ✓ Ideal |
| 4+ bed, 2+ bathrooms, higher demand | 30kW+ | ✓ Recommended |
| Rural / LPG property, 3–4 bed | 28–30kW | ✓ Ideal — LPG kit included |
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| Free Delivery | On all orders over £500 — UK mainland |
| Standard Delivery | Charged on orders under £500 — calculated at checkout |
| Delivery Area | UK mainland only. Not to Northern Ireland, Scottish Highlands, Channel Islands, or overseas |
| Lead Time | Up to 14 working days. Call 01282 429061 to confirm stock |
| ⚠ Boiler Returns Note | We cannot accept returns of boilers once the packaging has been opened. Confirm the correct model with your Gas Safe engineer before opening. Statutory rights not affected. |
| Finance | Klarna and Clearpay available at checkout |
| Returns Window | 14 days from receipt — unopened packaging only |
| Boilers — Special Condition | Cannot be returned once packaging is opened. Confirm with your engineer first. |
| How to Return | Request a returns number in writing first. Call 01282 429061 |
| Return Postage | Customer’s responsibility. Original delivery charges non-refundable. |
| Restocking Charge | 25% may apply to non-faulty returns |
| Faulty Items | Sent to manufacturer for testing. If confirmed faulty, 100% of original product value credited. |
| Guarantee Claims | Contact Ariston UK direct: 03332 407 777 |
