The Ariston Alteas ONE+ NET is Italy's flagship wall-hung condensing combi boiler, combining 94% seasonal efficiency, A+ ErP energy rating, and built-in Wi-Fi connectivity in a single ultra-premium unit. Housed behind a Ultrasafe black glass front panel, this 30 kW or 35 kW boiler ships complete with the Cube RF wireless modulating room sensor, the standard horizontal flue kit, and full Ariston NET smartphone app readiness — genuinely Boiler Plus compliant straight from the box. Compatible with 20% hydrogen blends and auto-calibrating between natural gas and LPG without a conversion kit, it is the definitive choice for high-demand homes where design, intelligence, and long-term reliability are non-negotiable.
12 yr
Warranty (Approved Installer)
⚠ Gas Safe Registered Installer Required: This boiler must be installed and commissioned by a Gas Safe registered engineer in accordance with current Gas Safety (Installation and Use) Regulations. The 12-year warranty is only valid when installed by an Ariston Approved Installer who registers the appliance within 28 days of installation.
ℹ Boiler Plus Compliant — Out of the Box: The Alteas ONE+ NET ships with the Cube RF modulating wireless room sensor, making it fully Boiler Plus compliant without any additional controls purchase. The Cube RF communicates actual room temperature to the boiler for true load-compensation heating.
ℹ Hydrogen-Blend Ready: The Alteas ONE+ NET is factory-verified as compatible with up to 20% hydrogen blends (H20), positioning it for the UK gas network's future without any modification.
XtraTech™ Stainless Steel Heat Exchanger
Ariston's patented XtraTech™ stainless steel heat exchanger features wider waterways than conventional aluminium alternatives, reducing limescale accumulation risk and improving thermal transfer. TÜV Rheinland-certified performance underpins the 12-year component warranty.
Cube RF Modulating Room Sensor — Included
The included Cube RF wireless thermostat is a load-compensating modulating controller — it continuously adjusts boiler output based on how far the room is from target temperature, rather than switching on/off at full power. This is what delivers the A+ ErP rating in practice.
Built-in Wi-Fi & Ariston NET App
An embedded Wi-Fi gateway connects directly to the Ariston NET smartphone app, enabling remote heating and hot water control, schedule programming, fault notification, and Internet Weather Compensation — where the boiler adjusts flow temperature based on live outdoor conditions.
Auto Fuel Calibration — Gas or LPG
The Combustion Control System detects gas type at commissioning and self-calibrates — the boiler can run on natural gas or LPG without a conversion kit. This simplifies stock management and makes the unit suitable for off-grid or rural properties.
1:10 Modulation & Advanced Diagnostics
A 1:10 modulation ratio means the boiler can turn down to 3.1 kW minimum output on heating — critical for well-insulated homes where gross oversizing causes short-cycling. Advanced Data Science diagnostics log operational data to aid fault-finding and reduce service time.
AUTO, COMFORT, CARE & Time Programming
AUTO function learns occupancy patterns and pre-heats accordingly. COMFORT mode keeps the DHW circuit primed to reduce draw-off wait time. CARE mode provides frost protection and pump exercise. All programmable via the backlit touch display or Ariston NET app.
| Technical Specifications — Alteas ONE+ NET |
| Parameter |
30 kW |
35 kW |
| Product Code |
3302395 |
3302395 |
| Heat Output Max — CH |
31 kW |
34.5 kW |
| Seasonal Efficiency |
94% (with Cube RF controls) |
| ErP Energy Rating |
A+ (heating) / A (DHW) |
| DHW Flow Rate ΔT 35°C |
14.1 l/min |
| Min/Max CH Temperature (High) |
35 / 82°C |
| Min/Max CH Temperature (Low) |
20 / 45°C |
| DHW Temperature Range |
36 / 60°C |
| Min DHW Flow Rate |
2 l/min |
| DHW Pressure Min/Max |
0.2 / 7.0 bar |
| Built-in Expansion Vessel |
8 litres |
| Noise Level |
49 dB / Band XXL |
| NOx Emissions |
From 24 mg/kWh (Class 6) |
| Weight |
36 kg |
| Dimensions H × W × D |
745 × 400 × 385 mm |
| Electrical Supply |
230 V / 50 Hz |
| IP Rating |
IPX5D |
| Max Coaxial Flue Length (Ø60/100) |
Up to 5 m |
| Max Coaxial Flue Length (Ø80/125) |
Up to 14 m |
| Hydrogen Compatible |
Yes — up to 20% blend (H20) |
| SAP 2009/2012 Efficiency |
89.3% |
| Warranty |
12 years (Ariston Approved Installer); 2 years standard |
Frequently Asked Questions
Does the Alteas ONE+ NET include the Cube RF thermostat and horizontal flue kit?
Yes. This listing includes the boiler, the Cube RF wireless modulating room sensor and receiver, and the standard horizontal coaxial flue kit (Ø60/100). The Cube RF is what qualifies the boiler for the A+ ErP rating and satisfies the Boiler Plus load-compensation requirement — nothing additional is needed for a compliant installation in most properties.
What is the maximum horizontal flue run for the 35 kW model?
Using the standard Ø60/100 coaxial system, the maximum flue run is 5 metres for the 35 kW version. Upgrading to Ø80/125 coaxial extends this to 14 metres. Twin-pipe configurations are also supported — refer to the installation manual for full reduction tables when elbows or bends are used.
How does Internet Weather Compensation work on the Alteas ONE+ NET?
When connected to the Ariston NET app via the built-in Wi-Fi, the boiler retrieves live outdoor temperature data and automatically adjusts the central heating flow temperature accordingly — raising it when the weather is cold and lowering it during milder conditions. This reduces gas consumption by preventing the boiler from overshooting on mild days, complementing the Cube RF's indoor load-compensation.
Can the Alteas ONE+ NET run on LPG without a conversion kit?
Yes. The Combustion Control System automatically detects the fuel type at commissioning and self-calibrates the air-to-gas ratio without any physical conversion kit. This is unique to the Alteas ONE+ NET range and makes it equally suitable for mains natural gas (G20) and bottled LPG (G31) properties.
How do I qualify for the 12-year warranty?
The 12-year warranty requires installation by an Ariston Approved Installer, completion of the Benchmark commissioning checklist, and registration of the appliance with Ariston within 28 days of installation. Standard warranty without Approved Installer registration is 2 years. Annual servicing by a Gas Safe registered engineer is required to maintain warranty validity.
Is the Alteas ONE+ NET suitable for underfloor heating systems?
Yes. The low-temperature range of 20–45°C flow temperature makes the Alteas ONE+ NET fully compatible with underfloor heating circuits. A blending valve is typically still recommended to protect the UFH manifold and limit surface temperatures. The boiler also includes a Floor Drying function for use during screed curing on new-build UFH installations.
