Wota Unit

JP
EN

Future Water Regeneration
at Home

WOTA Unit is a home water system designed to eliminate your water challenges—whether it’s shortages, quality concerns, or wastewater management. By regenerating up to 97%* of wastewater from showers, kitchens, and washing machines into high-quality water, it dramatically reduces the dependence on rainwater and utility supply.

  • * Actual results may vary depending on usage and conditions.

Life with the WOTA Unit

The usage estimates shown are based on a total storage capacity of 650L — consisting of the WOTA Unit itself (150L) and two optional 250L tanks — and assume average household water use for a family of three (according to our internal research).

Water Volume & Number of Uses Chart (Gallons)
– Caribbean

  • Dish Washing: 5.3 gal / 32 times
  • Toilet: 4 gal / 43 times
  • Shower: 21 gal / 8 times
  • Laundry: 40 gal / 4 times

Features

  • Clean Water

    WOTA Unit provides clean, safe water that meets WHO Guidelines for drinking-water quality. Say goodbye to concerns about bacteria, viruses, or harmful chemicals.

  • Water Resilience

    Even in times of drought or infrastructure failures, WOTA Unit can continue operating as long as electricity is available. This allows you to live independently of local water infrastructure issues.

  • Smart Maintenance

    You can monitor available water levels and receive maintenance notifications through the dedicated app. Managing your daily water supply has never been easier.

Dedicated app to monitor water usage

  • Current available water
  • Estimated time to water recovery
  • Remaining uses based on
    current water level
  • Check remaining rainwater tank level

  • Current available water

  • Estimated time to water recovery

  • Remaining uses based on
    current water level

  • Check remaining rainwater tank level

How It Works

* Actual results may vary depending on usage and conditions.
In pilot testing conducted on-site at the WOTA Lab in Antigua and Barbuda, a 95% result was achieved.

  • Rainwater collected from the roof is stored in a tank.

  • Rainwater and greywater undergo biological treatment, membrane filtration, and disinfection using UV light and chlorine, ensuring safe, drinkable water. Biological treatment uses microbes (see right) to decompose organic matter, common in large sewage plants.

  • Showers, kitchens, washing machines, and toilets can be used just like in a conventional home. While water recycling takes a little time, the system is designed to ensure a steady supply throughout the day.

  • All greywater from showers, kitchens, and washing machines is collected and treated by the WOTA Unit. To maintain optimal system performance, avoid discharging chemicals or food waste that could overload microorganisms or filters.

  • Wastewater from toilets is directed to a septic tank, ensuring complete separation from the regenerated water and preventing any risk of contamination.

  • Any water loss throughout the process is
    replenished from the storage tank.

Our Technology

What ensures the safety of the WOTA Unit is our proprietary autonomous water treatment control technology. The system monitors water quality, water pressure, and other parameters using sensors, and automatically controls the operation of the equipment through algorithms to maintain optimal system conditions. Thanks to this technology, advanced water treatment—typically performed in large-scale water purification or sewage treatment plants under the supervision of professional operators—can now be carried out in ordinary households. The quality of water supplied by the WOTA Unit complies with the WHO Guidelines for drinking-water quality.

Specs

SizeW 1680mm (66.14in) × D 780mm (30.71 in) × H 1400mm (55.12 in)
Main unit weight166kg (when dry)
Source WaterGreywater from showers, sinks, laundry machines (up to 97% regenerating,with rainwater replenishment)
Treatment Capacity438 –720 L /day (116–190 US gal /day)
Use Environment0℃ (32°F)* to 40℃ (104°F),
Tested for corrosion and strong winds (equivalent to Category 3 hurricanes).
Power110 V / 60Hz 105 W
  • * If the installation site is susceptible to freezing conditions, please select the cold-climate specification option.

WOTA Unit is currently under development for mass production with support from the New Energy and Industrial Technology Development Organization (NEDO), a national research and development agency in Japan. Please note that the specifications and performance are subject to change as development progresses.