Compare the same temperature and humidity
The figures below are manufacturer specifications for the MeacoDry Arete One family, read on 4 October 2026. They are not EcoBack measurements, an independent ranking, or a comparison with Arete Two. Litres/day describe water extraction at the stated test point.
| Model | Conditions | Extraction | Power |
|---|---|---|---|
| Arete One 12L | 10°C / 60% RH | 1.95 L/day | 130 W |
| Arete One 20L | 10°C / 60% RH | 3.4 L/day | 180 W |
| Arete One 12L | 20°C / 60% RH | 5.23 L/day | 151 W |
| Arete One 20L | 20°C / 60% RH | 8.5 L/day | 216 W |
The same 12L model lists 12.18 L/day at 30°C / 80% RH. That does not mean it will remove 12 litres per day in a cool UK bedroom. Both models extract less at the cooler 10°C / 60% test point than at 20°C / 60%.
Does the lower-wattage machine cost less to finish the job?
Not necessarily. At the 20°C / 60% test point, the 12L model has lower power but also lower water extraction. Hourly cost is not the same as cost to reach a target humidity or dry a load. Real conditions change during operation, and cycling, ventilation and new moisture affect the result. Measure a whole comparable session before claiming a saving.
When a larger capacity may be useful
Consider a larger model if the smaller one cannot maintain the chosen conditions despite correct use and resolving moisture sources, or if its tank and operating schedule do not suit you. This table alone cannot establish the capacity required for a specific home. A larger tank may reduce emptying, but tank size is not extraction capacity.
Why bedroom count is an incomplete shortcut
Note the actual room volume, temperature, moisture source, door arrangement and airflow. A unit in a hallway is not guaranteed to control closed bedrooms. Noise at your chosen setting, drainage, placement clearances and the ability to move the unit also matter. Ask for performance at relevant temperature and humidity, rather than relying solely on the advertised number of rooms.
A cold room changes the decision
Check the manufacturer’s operating range and performance curve. A cold-room decision may involve compressor versus desiccant operation, but do not assume that a technology label proves the lower whole-session cost. Follow the actual manual and account for the room’s moisture source.
Compare desiccant and compressor operation · Measure laundry running cost.
Purchase checklist
- Confirm the exact model generation and condition-matched extraction and watts.
- Check noise at the intended setting, tank access, drainage and placement.
- Identify leaks or ventilation faults that a purchase would not fix.
- Use your own tariff and a full session, not only maximum nameplate watts.
- Check current availability and return terms directly; this page makes no stock or price promise.
Manufacturer sources
MeacoDry Arete One 12L specifications · MeacoDry Arete One 20L specifications. These source links are not an independent endorsement or a claim that either is the best purchase for your home.