The Ariston Prios Net 50 MUA1 is a wall-mounted monoblock split air conditioning system delivering a nominal cooling capacity of 5.3 kW (18,000 BTU/h) — the mid-large model in the Prios Net lineup, suited to open-plan living areas, larger bedrooms, or commercial spaces up to approximately 60 m². Like all Prios Net models, the 50 MUA1 features built-in Wi-Fi with Ariston NET app control, ECO Mode, Turbo Mode, and a 2D Inverter compressor with R32 refrigerant. It achieves Class A++ energy efficiency in cooling and Class A+++ in heating during the warmer season, reflecting the efficiency gains that R32 and inverter technology deliver at larger outputs. The heat pump function remains operational to −15 °C outdoor ambient. Product code: 4213072.
A++/A+++
Energy Class Cool/Heat
Built-in
Wi-Fi (Ariston NET)
≤60 m²
Recommended Room Size
🔴 Installer Notice — F-Gas & Electrical Supply
R32 is mildly flammable (A2L). Only F-Gas certified engineers may handle refrigerant on this system. At 5.3 kW output, verify that the dedicated electrical circuit is correctly rated for the unit's maximum input current before installation. Use only R32-compatible vacuum pumps, pressure gauges, and manifold sets during commissioning.
🟠 Structural Considerations for Larger Outdoor Unit
The outdoor unit for the 50 MUA1 is heavier and larger than the 25 or 35 variants. Verify that the proposed mounting surface or bracket is rated for the outdoor unit weight before installation. For wall-bracket installations on rendered or older masonry, a structural assessment may be advisable. Ensure the installation site provides adequate minimum clearances on all sides of the outdoor unit for correct airflow and defrost drainage.
🟢 Open-Plan & Larger Room Specialist — 5.3 kW Output
The Prios Net 50 MUA1 is the right choice when a single indoor unit needs to condition a larger, open-plan space — including combined kitchen-dining-living areas, conservatories, and larger bedrooms above 40 m². Its Class A+++ heating efficiency in the warmer season and the system's ability to operate in sub-zero outdoor conditions make it equally effective as a year-round climate and heating solution, replacing or supplementing conventional radiator-based systems.
A+++ Heating Efficiency (Warmer Season)
The 50 MUA1 achieves Energy Class A+++ in heating during the warmer season, making it one of the most efficient heat sources available for its output range. For every 1 kWh of electricity consumed in heating mode, the unit delivers significantly more than 1 kWh of thermal energy to the room — the heat pump cycle extracts free energy from outdoor air, meaning running costs are substantially lower than any direct electric heating alternative.
Turbo Mode — Rapid Conditioning at Scale
At 5.3 kW, Turbo Mode has even greater impact than in smaller models. Returning to a hot conservatory or large open-plan space in summer, activating Turbo allows the system to deploy its full cooling output immediately — rapidly pulling the room temperature down before settling into efficient steady-state operation. The same applies in winter: Turbo rapidly delivers heat to cold spaces before the system reduces power once comfortable temperatures are established.
Airflow Comfort — Intelligent Directional Control
Airflow Comfort mode automatically adjusts the indoor unit's louvre angle based on operating mode: upward in cooling (cold air naturally falls, distributing evenly through the room) and downward in heating (warm air rises, so directing it downward ensures it reaches occupant level before ascending). In larger rooms, this directional intelligence makes a meaningful difference to how quickly and evenly the space reaches the set temperature.
Low Ambient Cooling
The Low Ambient Cooling function allows the system to operate in cooling or dehumidification mode even when outdoor temperatures are low — a useful feature for UK spring and autumn when indoor spaces can become humid and stuffy while outdoor temperatures are already cool. This prevents the need to open windows during periods of rain or wind, maintaining a more controlled internal environment year-round.
Self-Clean Function — Automated Maintenance
At shutdown, the Self-Clean function reverses the outdoor fan direction to blow air through the outdoor coil from the inside out — dislodging accumulated dust and biological debris without requiring manual access. This automatic maintenance routine preserves heat exchanger efficiency between engineer visits, helping the system maintain its rated performance throughout the service interval.
Ariston NET App — Energy Insight
With the built-in Wi-Fi and Ariston NET app, the 50 MUA1 can report detailed energy consumption data over daily, weekly, and monthly periods. For a larger, higher-output system such as this, understanding actual consumption patterns is valuable for managing running costs. Schedule the system to condition spaces before occupancy and reduce output during empty periods — all from a smartphone.
| Technical Specification — Ariston Prios Net 50 MUA1 (Product Code 4213072) |
| Performance |
| Nominal Cooling Capacity |
5.3 kW (18,000 BTU/h) |
| Reference Size (kBPU) |
18,000 kBPU |
| Energy Efficiency Class (Cooling) |
A++ |
| Energy Efficiency Class (Heating — Warmer Season) |
A+++ |
| Energy Efficiency Class (Heating — Average Season) |
A++ |
| Refrigerant & Environmental |
| Refrigerant Type |
R32 |
| GWP |
675 (low-GWP) |
| Outdoor Operating Range (Cooling) |
−15 °C to +50 °C |
| Outdoor Operating Range (Heating) |
−15 °C to +30 °C |
| Indoor Unit |
| Type |
Wall-mounted |
| Fan Speeds |
12 (incl. Turbo, Silent, Dehumidify) |
| Condensate Drain |
Left or Right |
| Outdoor Unit |
| Inverter |
2D Inverter (compressor + fan) |
| Outdoor Fan |
5-speed DC motor |
| Heat Exchanger Treatment |
Golden Fin anti-corrosion coating |
| 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, Low Ambient Cooling |
| Standby Power |
≈1 W |
| Piping & Installation |
| Liquid Pipe Diameter |
¼ inch |
| Gas Pipe Diameter |
½ inch |
| Max Pipe Length (standard charge) |
5 m |
| Max Pipe Length (total) |
25 m |
| Identification |
| Product Code |
4213072 |
| Warranty |
2 years (official Ariston) |
Is the Prios Net 50 suitable for a large open-plan kitchen-dining-living area?
Yes, the 50 MUA1 at 5.3 kW / 18,000 BTU is Ariston's recommendation for spaces up to approximately 60 m² at standard ceiling height. Open-plan areas often present a higher cooling load than equivalent closed rooms (due to kitchen heat sources and larger glazing areas), so the 50 MUA1's higher output headroom is a genuine advantage in these environments. A room heat-loss assessment is recommended to confirm suitability before purchase.
How does the A+++ heating classification compare to A++?
A+++ is the highest tier on the EU/UK energy label scale. It indicates a SCOP significantly above 5.0 in the applicable seasonal heating assessment. For a homeowner or building manager, this means lower electricity consumption per unit of heat delivered compared to an A++ unit — translating directly to reduced running costs over the heating season. The 50 MUA1 achieves A+++ during the warmer seasonal heating assessment, reflecting its efficiency at partial load conditions.
What electrical supply does the Prios Net 50 MUA1 require?
The 50 MUA1 operates on a standard 230V single-phase supply. At 5.3 kW output, the maximum electrical input current will be higher than the smaller Prios Net models. A qualified electrician should verify that the existing or proposed circuit and MCB rating are appropriate before installation. A dedicated circuit is strongly recommended — do not share with other high-draw appliances.
What maintenance does the outdoor unit require?
The outdoor unit benefits from an annual inspection by a qualified engineer, who should check refrigerant charge, electrical connections, and airflow. The Self-Clean function helps clear surface debris automatically at each shutdown. The Golden Fin coating reduces the frequency of coil cleaning required, but in coastal or urban locations, a periodic coil wash by an engineer will maintain optimal heat transfer efficiency. Ensure the area around the outdoor unit is kept clear of vegetation, fencing, and stored items.
Can the 50 MUA1 dehumidify without significantly cooling the room?
Yes. In Dehumidify mode, the system runs the compressor at reduced capacity with the indoor fan at a low speed, removing moisture from the air while minimising temperature reduction. This is particularly useful in spring and autumn when UK humidity levels are high but active cooling is not required. The Low Ambient Cooling function additionally allows the system to operate in cooling/dehumidification mode even when outdoor temperatures are already low.
