The Ariston Prios Net 35 MUA1 is a wall-mounted monoblock split air conditioning system with a nominal cooling capacity of 3.5 kW (12,000 BTU/h), suited to rooms up to approximately 40 m². Building on the same intelligent platform as the full Prios Net range, it includes factory-integrated Wi-Fi, ECO Mode for economical running, and Turbo Mode for rapid temperature pull-down — all controllable via the Ariston NET app. The indoor unit's distinctive arched fascia and sub-200 mm depth make it unobtrusive in any domestic setting. Charged with low-GWP R32 refrigerant and driven by a 2D Inverter compressor, the 35 MUA1 achieves Class A++ energy efficiency in both cooling and heating, with heat pump operation available down to −15 °C ambient. Product code: 4213071.
A++
Energy Class (Cool & Heat)
Built-in
Wi-Fi (Ariston NET)
≤40 m²
Recommended Room Size
🔴 Installer Notice — F-Gas & Refrigerant Regulations
R32 refrigerant is mildly flammable (A2L classification). Installation, commissioning, and servicing must be carried out by a qualified F-Gas certified engineer. All refrigerant handling must comply with current UK F-Gas Regulations. Only R32-rated tools, gauges, and vacuum pumps should be used during installation. Do not mix with other refrigerants.
🟠 System Matching — Monoblock Split Only
The Prios Net 35 MUA1 is supplied as a matched monoblock system comprising a dedicated indoor unit and its paired outdoor unit. These cannot be mixed with outdoor units from other series or manufacturers. Always verify that the installation site allows adequate clearance around the outdoor unit for unobstructed airflow. The standard refrigerant charge covers pipe runs up to 5 m; additional R32 charge is required for longer runs up to the 25 m maximum.
🟢 The Most Popular Size — Versatile Mid-Range Capacity
At 3.5 kW / 12,000 BTU, the Prios Net 35 is the most widely specified capacity in the Prios Net range. It covers the majority of UK residential rooms — living rooms, master bedrooms, open-plan kitchen-diners, and home offices — at standard UK ceiling heights. The SEER of 6.1 (A++ cooling) and SCOP of up to 4.64 (warmer season) place it among the more efficient units in its class.
2D Inverter — Precision Modulation
Two separate inverters control the outdoor fan and the compressor independently, enabling fine-grained power modulation. Once the setpoint is reached, the system settles at the minimum output needed to hold the temperature steady, rather than cycling on and off. This continuous, low-power operation delivers better temperature stability, lower noise, and reduced electricity bills.
12-Speed Indoor Fan
The indoor fan operates across 12 discrete speed levels — three main settings (High / Medium / Low) each with three sub-levels, plus dedicated speeds for Dehumidify, Turbo, and Silent modes. This granularity means the unit can whisper-quiet during sleeping hours while still delivering forceful pull-down when needed, all via a single remote or the Ariston NET app.
Memory Function
The Memory function stores preferred temperature, fan speed, and sleep settings so they are automatically recalled each time the unit is switched on. This eliminates the need to reprogram the unit daily and ensures preferred comfort conditions are immediately restored, even after a power interruption or deliberate switch-off.
Dehumidification Mode
In Dehumidify mode, the system removes excess moisture from the air at a reduced fan speed without aggressive cooling, addressing the UK's characteristically humid conditions. This is particularly beneficial in spring and autumn when temperatures are moderate but humidity remains high — reducing the risk of condensation, damp, and mould without chilling the space unnecessarily.
Follow Me — Remote Temperature Sensing
The Follow Me feature uses the infrared remote control's onboard temperature sensor as the conditioning reference point. Rather than reading temperature at the wall unit (often above head height, near the ceiling), the system targets the exact ambient temperature where the occupant is sitting. In large rooms, this can make a meaningful difference to actual comfort.
Golden Fin & Anti-Corrosion Protection
Golden Fin is Ariston's hydrophilic coating applied to the outdoor heat exchanger coil. It encourages condensate to sheet off cleanly, speeds up defrost cycles in cold weather, and forms a durable barrier against salt-laden coastal air, urban pollutants, and acid rain. For UK installations — particularly in coastal or industrial areas — this protection meaningfully extends the working life of the outdoor unit.
| Technical Specification — Ariston Prios Net 35 MUA1 (Product Code 4213071) |
| Performance |
| Nominal Cooling Capacity |
3.5 kW (12,000 BTU/h) |
| Reference Size (kBPU) |
12,000 kBPU |
| SEER (Seasonal Energy Efficiency Ratio) |
6.1 |
| SCOP (Warmer Season) |
4.64 |
| SCOP (Average Season) |
4.00 |
| Nominal Heating Capacity |
2.4 kW (rated) |
| Energy Efficiency Class (Cooling) |
A++ |
| Energy Efficiency Class (Heating) |
A++ / A+++ (warmer season) |
| Refrigerant & Environmental |
| Refrigerant Type |
R32 |
| Standard Refrigerant Charge |
0.33 kg |
| Additional Charge per Extra Metre |
12 g/m |
| Outdoor Operating Range (Cooling) |
−15 °C to +50 °C |
| Outdoor Operating Range (Heating) |
−15 °C to +30 °C |
| Indoor Unit |
| Type |
Wall-mounted |
| Depth |
<200 mm |
| Weight (net) |
7.5 kg |
| Fan Speeds |
12 |
| Indoor Airflow Rate |
527 m³/h (max) |
| Condensate Drain Position |
Left or Right |
| Outdoor Unit |
| Inverter |
2D Inverter (compressor + fan) |
| Outdoor Fan Speeds |
5-speed DC motor |
| Outdoor Unit Weight (net) |
22.7 kg |
| Connectivity & Control |
| Wi-Fi |
Built-in (no dongle required) |
| App |
Ariston NET (iOS & Android) |
| Operating Modes |
Cool, Heat, Dehumidify, Fan, Auto, ECO, Turbo, Sleep, Follow Me |
| Standby Power |
≈1 W |
| Piping & Installation |
| Liquid Pipe Diameter |
¼ inch |
| Gas Pipe Diameter |
⅜ inch |
| Max Pipe Length (standard charge) |
5 m |
| Max Pipe Length (total) |
25 m |
| Max Height Difference |
10 m |
| Identification |
| Product Code |
4213071 |
| Warranty |
2 years (official Ariston) |
Why is the 35 MUA1 the most commonly specified Prios Net model?
At 3.5 kW / 12,000 BTU, the 35 MUA1 covers the broadest range of typical UK room sizes — from 25 to 40 m² at standard 2.7 m ceiling height. This encompasses most living rooms, open-plan kitchen-diners, and master bedrooms. It also delivers a useful balance between peak cooling output, heating efficiency, and indoor noise, making it appropriate for both day and night use.
What does SEER 6.1 mean in practical terms?
The Seasonal Energy Efficiency Ratio (SEER) of 6.1 means that for every 1 kWh of electricity consumed, the unit delivers approximately 6.1 kWh of cooling energy to the room over a seasonal period. For comparison, a standard electric heater has a coefficient of 1.0. The higher the SEER, the lower your cooling running costs — SEER 6.1 corresponds to Energy Class A++ under EU/UK labelling regulations.
What is the Ariston NET app capable of?
The Ariston NET app (available free on iOS and Android) allows full remote control of the Prios Net including: temperature and mode selection, fan speed, schedule programming, and enabling or disabling ECO or Turbo modes. It also provides energy consumption reports and, where your installer is registered on the Ariston NET Pro service, enables remote fault diagnosis — potentially resolving issues without a site visit.
Can I use this unit as my primary heat source in winter?
The Prios Net 35 MUA1 is capable of providing supplementary or primary space heating in well-insulated UK properties. With a SCOP of 4.64 in the warmer heating season and operation possible to −15 °C outdoor ambient, it is considerably more efficient than electric panel heaters or storage heaters. For properties relying on it as a primary heat source through deep winter, ensure the room's heat loss has been assessed and that the unit's capacity is adequate.
How noisy is the Prios Net 35 during normal operation?
The 12-speed indoor fan allows the unit to run at very low airflow levels during Sleep or Silent mode, where noise is typically in the low-to-mid 20 dB(A) range at the indoor unit — quieter than a typical domestic refrigerator. On maximum fan speed, noise levels rise but remain within the comfort range for most living environments. The 5-speed DC outdoor fan modulates to minimise noise at the outdoor unit, especially at night when compressor load is typically lower.
