Heat Recovery Ventilation for Individual Spaces
Mould and excess moisture are common problems in spaces where a centralised heat recovery ventilation system simply isn't an option. The Ariosa DOT solves this with a plug & play design — no ductwork or air distribution network required, just three holes and a power connection. It suits a wide range of settings, from residential rooms and small offices to professional studios and medical clinics.
By continuously exchanging stale air for fresh, filtered air, the unit keeps heat loss to a minimum while maintaining a healthy, comfortable atmosphere throughout the year. In rooms prone to damp, pairing the Ariosa DOT with a dehumidifier adds an extra layer of moisture control, and combining it with an air purifier further improves overall air quality — giving you a more complete indoor air solution.






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 |

