Klarstein Smart 4-in-1
App control, ionised air, 30W sip.
- App control + scheduling
- Built-in air ioniser
- Only 30W — pennies an hour
- 4-in-1: cool, fan, humidify, purify
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13.4% slower reaction times (and 13.3% slower working-memory responses) measured in homes without cooling during a real heatwave, versus air-conditioned homes. Cedeño Laurent et al., PLoS Medicine, 2018
What does a cool night actually cost?
Klarstein Smart 4-in-1 draws just 30W — about the same as an old lightbulb.
Based on 30W at 24.5p/kWh (uk avg). Your tariff may vary — it'll still be pennies.
- Tank capacity
- 6 L
- Airflow
- 210 m³/h
- Noise
- 50 dB (max)
- Power
- 30 W
- Height
- 70 cm
- Weight
- 6 kg
- Room size
- up to 12 m²
- Speeds
- 3 + sleep
- Timer
- 12 h
- Controls
- App, remote, touch
Quieter than your conversation.
Quiet enough for TV evenings; sleep mode drops it lower.
What it actually does, in numbers.
per hour to run
based on uk avg electricity rates
| Water tank | 6L |
| Airflow | 210 m³/h |
| Noise | 50 dB |
| Power draw | 30 W |
| Height | 70 cm |
| Weight | 6 kg |
| Running cost | <1p/hour |
| Covers rooms to | 12 m² |
Every spec on this page comes from the manufacturer's data sheet. We don't invent airflow figures or noise ratings — if a unit can't meet its claims, it doesn't go in the range.
