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| Manufacturer | Scudo |
|---|---|
| Manufacturer Part No | 3301131 |
Home > Boilers > Combi Boilers > LPG Boilers > Ariston E-Combi ONE 24kW LPG Ready Combi Boiler
Compact condensing combi boiler for flats and homes with 1–2 bathrooms. LPG conversion kit included — ready for natural gas or LPG. Patented XtraTech™ stainless steel heat exchanger. 94% ErP seasonal efficiency. 22kW CH / 26kW DHW at 10.4 l/min. 49dB 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 approximately 3.1kW minimum and 22kW 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 just 49dB — 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 315mm and just 29.3kg, this is one of the most compact 24kW combi boilers available — 70mm shallower than the 30kW version. Ideal for tight kitchen cupboards and airing cupboards where space is at a premium. Pipework connections match previous Ariston Cares ONE models for easy retrofit.
Boilers are large, heavy, high-value goods. Once a boiler box has been opened, hung, pressure-tested or commissioned, we cannot accept it back for change-of-mind returns.
Full legal terms in the Delivery & Returns tab. Your statutory rights under the Consumer Rights Act 2015 are not affected for faulty or damaged goods.
All data verified against the official Ariston E-Combi ONE product datasheet (Ariston library reference 64496858, product code 3301131) and cross-referenced with MP Moran and Plumbing Giant trade listings.
| Specification | E-Combi ONE 24kW |
|---|---|
| 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 2009/2012 | 89.4% |
| ErP Tapping Profile | XL |
| NOx Emissions | 53 mg/kWh |
| Sound Power Level (indoors) | 49 dB |
| Specification | E-Combi ONE 24kW |
|---|---|
| Max CH Heat Output | 22kW |
| Max DHW Heat Output | 26kW |
| DHW Flow Rate (ΔT35°C) | 10.4 l/min |
| Modulation Ratio | 1:7 (min ~3.1kW) |
| 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 24kW |
|---|---|
| Height | 745mm |
| Width | 400mm |
| Depth | 315mm — 70mm shallower than 30kW |
| Weight (empty) | 29.3kg |
| 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 + LPG Kit) | 3301131 |
| 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 | DHW Flow | Depth | Weight |
|---|---|---|---|---|---|
| E-Combi ONE 24kW THIS PRODUCT | 22kW | 26kW | 10.4 l/min | 315mm | 29.3kg |
| E-Combi ONE 30kW | 28kW | 30kW | 12.5 l/min | 385mm | 31.9kg |
All data from official Ariston datasheets (product codes 3301131 / 3301132).
The E-Combi ONE 24kW 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, 1–2 bathroom homes 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 315mm |
| Weight | 29.3kg |
| 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 | 24kW Suitable? |
|---|---|---|
| Flat / 1-bed, 1 bathroom | 18–24kW | ✓ Ideal |
| 2-bed, 1 bathroom, good insulation | 22–24kW | ✓ Ideal |
| 2–3 bed, 1 bathroom, average insulation | 24–26kW | Borderline — engineer to calculate |
| 3–4 bed, 2 bathrooms | 28–30kW | Likely undersized — consider 30kW version |
| 4+ bed, 2+ bathrooms | 30kW+ | Undersized — see 30kW version |
| Rural / LPG property, 1–2 bed | 22–24kW | ✓ Ideal — LPG kit included |
| Holiday cottage / annex | 18–22kW | ✓ Ideal — for smaller properties |
Looking for a 24kW LPG combi boiler? The Ariston E-Combi ONE 24kW (part no. 3301131) is found via the following searches: Ariston E-Combi ONE 24kW LPG combi boiler, Ariston E-Combi ONE 24kW 94% efficient, Ariston 3301131, Ariston E-Combi ONE LPG propane boiler UK, 24kW LPG condensing combi boiler off-grid, Ariston XtraTech heat exchanger combi boiler 24kW, E-Combi ONE ErP A rated 24kW, Ariston E-Combi ONE plumbxtra, slim 315mm depth combi boiler, narrow combi boiler small cupboard, LPG combi boiler 24kW rural property UK, replace Morco LPG boiler Ariston, Ariston E-Combi ONE 22kW CH 26kW DHW, small LPG combi boiler 24kW. Compared against the Worcester Bosch Greenstar 25i / 28i, Vaillant ecoTEC plus 825 / 831, Ideal Logic Max Combi2 C24 / C30 and Baxi 624 / 630 Combi2, the Ariston E-Combi ONE 24kW offers similar ErP efficiency at a typically lower price point with the added benefit of an LPG conversion kit included as standard and a slimmer 315mm cabinet depth. Also relevant for searches: Ariston vs Worcester 24kW combi LPG, Vaillant LPG alternative 24kW, Ideal Logic LPG boiler 24kW, best LPG combi boiler 2026 UK, off-grid 2 bed house combi boiler, holiday cottage LPG boiler 24kW, slim combi boiler narrow cupboard, propane combi boiler UK 24kW, Ariston E-Combi ONE plumbxtra 24kW LPG ready, replace Worcester LPG boiler with Ariston 24kW.
| Boiler Delivery Charge | £50 flat-rate UK mainland delivery — added at checkout. Boilers are excluded from our free delivery offer due to size, weight and specialist handling requirements. |
| Why is delivery charged on boilers? | Boilers are heavy, large-format goods requiring specialist insured handling. The £50 charge reflects the protection, palletisation and signed two-person handover required for safe doorstep delivery. |
| Delivery Area | UK mainland only. Not delivered to Northern Ireland, Scottish Highlands, Channel Islands, Isle of Man or overseas. |
| Lead Time | Up to 14 working days. Call 01282 429061 to confirm current stock and delivery date before ordering. |
| Free Delivery (other products) | Free UK mainland delivery applies to non-boiler orders over £500 (radiators, fittings, bathrooms, accessories). |
| Finance | Klarna and Clearpay available at checkout |
We understand that change-of-mind situations occur. Under the Consumer Contracts Regulations 2013 you have the right to cancel your order within 14 days of receipt — however, due to the nature, size and value of boilers, the following specific conditions apply:
To avoid any of the restrictions below, please follow these steps before opening your boiler:
Wrong-size or wrong-specification orders fall under the change-of-mind returns policy below. PlumbXtra cannot be held responsible for incorrect kW, fuel type or model selection. If the wrong boiler is ordered and the packaging has not been opened, a change-of-mind return may be made under the terms of sections 2–6 below — including the 25% restocking fee in Section 3.
To qualify for a change-of-mind return, the boiler must be:
To begin a return, contact us in writing at enquiries@plumbxtra.com within 14 days of receipt to request a Returns Authorisation Number. Do not send any boiler back to us without this number — unauthorised returns will be refused.
If your boiler is returned in original sealed packaging and passes our inspection as eligible for change-of-mind return, a restocking fee of 25% of the original product value will be deducted from your refund.
Why a restocking fee applies — this deduction reflects the genuine costs PlumbXtra incurs in handling a returned boiler:
Legal basis: This restocking deduction is permitted under Regulation 34(9) of the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013, which allows traders to deduct from a refund an amount reflecting handling and diminished value of goods.
Worked example: On a boiler with an inc-VAT price of £552, the 25% restocking fee is £138. The refund issued would be £414 (less any non-refundable original delivery charge).
Refunds (less restocking fee and any other applicable deductions) are issued within 14 days of the boiler being received, inspected and accepted at our warehouse.
Boilers are heavy, large-format goods. Due to the size, weight and value of the product, PlumbXtra is unable to arrange or fund return collection. The customer is responsible for arranging and paying for safe return shipping using a fully insured courier suitable for boiler dimensions and weight. We strongly recommend retaining proof of postage and insurance. Original delivery charges are non-refundable.
