Breathe Better. Live Healthier.
Clean, filtered, energy-efficient ventilation for rooms of up to 70m².
Ariosa DOT is a decentralised heat recovery ventilation system that continuously removes stale, moisture-laden air and replaces it with fresh, filtered air. Designed to help reduce condensation, damp and mould, Ariosa DOT improves indoor air quality while maintaining comfort and energy efficiency.
Red Dot Award Winner 2025
A prestigious international award for product design, which positions the Ariosa brand as a leader in the HRV market.
View the award page
Valsir Ariosa DOT HRV Unit
A controlled mechanical ventilation system with heat recovery, engineered for residential homes, offices and boardrooms, schools, professional studios, hospitals, and medical clinics. The Ariosa DOT delivers constant, balanced air exchange through high-performance filtration and ultra-efficient heat recovery — creating a comfortable, hygienic indoor environment. For even greater control over air quality, it pairs seamlessly with air purifiers and dehumidifiers, offering a complete approach to healthier indoor air.
Key benefits
- Continuous fresh, filtered air
- Ceramic core recovers heat energy
- Reduces condensation and mould risk — complements a dehumidifier for full moisture control
- Quiet operation for bedrooms and living spaces
- Wi-Fi and app controlled
- Low-energy motor for everyday running
Technical specification
| Type | Single-room heat recovery ventilation (HRV) |
|---|---|
| Heat exchanger | Static air-to-air counterflow heat exchanger |
| Max air flow rate | 100 m³/h |
| Nominal air flow rate | 70 m³/h |
| Dry thermal efficiency | Up to 88% |
| Filtration | ISO Coarse >65% (ex G4) extract; ISO ePM1 >50% (ex F7) supply |
| Sound power level | 55 dB(A) |
| Power supply | 220 V / 1 ph / 50-60 Hz |
| Max absorbed power | 41.3 W |
| Operating range | -5°C to +45°C |
The importance of clean air for healthy living.
We spend much of our time indoors, where pollutants can quickly build up in poorly ventilated rooms and affect our health and wellbeing. Ariosa DOT continuously and quietly refreshes the air in a single room, helping create a cleaner, healthier indoor environment every day.
20,000 breaths a day
Every day we take over 20,000 breaths — absorbing vital oxygen and expelling CO₂. The air we breathe indoors directly shapes how we feel and how well we live.
Up to 20× worse indoors
Accredited studies have shown that air quality in enclosed environments can be up to 20 times worse than outdoors — pollutants build up quietly in sealed rooms.
Hidden hazardous substances
Fine dust, combustion fumes, VOCs from cleaners, glues and paints, plus allergens, mould, bacteria, viruses and radon — all concentrate in poorly ventilated spaces.
Prevention beats treatment
Long-term exposure to indoor pollutants is easy to underestimate. Continuous, filtered ventilation removes the risk before it can affect your health.
One HRV solution for individual rooms.
Struggling with mould or moisture in a room that can't accommodate a centralised HRV system? The Ariosa DOT offers the ideal solution — a controlled mechanical ventilation unit with heat recovery, designed specifically for single-room use. It's perfectly suited to residential rooms, small offices, professional studios and medical clinics.
Constant, balanced air exchange, combined with high-performance filtration and ultra-efficient heat recovery, delivers year-round comfort and hygiene in any environment. For rooms that need extra moisture control, the Ariosa DOT pairs effortlessly with a dehumidifier — while its filtration works hand-in-hand with an air purifier for a complete air quality solution.
- Continuous, low-energy fresh air
- Ceramic heat exchanger recovers warmth
- Filters pollen, dust and fine particles
- Wi-Fi and app controlled
Small unit. Big everyday difference.
Cleaner indoor air
Continuous fresh air exchange keeps rooms feeling light and easy to breathe.
Helps control moisture
Extracts humid air to help reduce condensation on windows and cold walls.
Supports mould prevention
Drier surfaces and better airflow make it harder for mould to take hold.
Recovers heat energy
A ceramic exchanger reuses warmth from outgoing air to pre-warm the incoming.
Quiet everyday comfort
Designed for bedrooms and living spaces — you won't notice it working.
Smart app control
Adjust modes, boost, and monitor from your phone via Wi-Fi.
One unit, many rooms.
Three quiet steps, running continuously.
Stale air is extracted
The unit gently draws humid, stale indoor air out of the room.
Fresh air is filtered
Incoming outdoor air passes through filters to trap dust, pollen and fine particles.
Heat is recovered
A ceramic core stores warmth from the outgoing air and gives it back to the incoming fresh air.
Trusted brands that complement Ariosa DOT.
A few quick answers.
What is Ariosa DOT?+
A compact heat recovery ventilation unit designed for a single room.
Does it help with condensation?+
Yes — by continuously extracting humid indoor air it helps keep windows and walls drier.
Is it suitable for bedrooms?+
Yes. It's designed for quiet, continuous operation, ideal for sleeping spaces.
Does the Ariosa DOT replace my air purifier or dehumidifier?+
No — the Ariosa DOT is designed to complement these devices, not replace them. It continuously exchanges stale air for fresh, filtered air and helps reduce condensation and moisture, while an air purifier targets airborne particles and a dehumidifier extracts excess moisture. Used together, they offer a more complete approach to healthy indoor air.