When additional energy is needed, a co-generation unit supplies additional electricity and heat. The ventilation system is designed to ensure that the air entering the house is as clean as possible and is evenly distributed. Drinkable water and waste water management Rain and snow collected from the roof provides all of the water supply. Water is stored in an underground cistern and purified without the use of chemicals. The house is also water self-sufficient, depending on rainfall for its water supply.
Rainwater is collected, filtered, purified and stored for drinking and washing.
It is then recycled for use in the showers, washing machine or toilets. Water consumption will be approximately 120 litres per day for a family of three. Normal consumption for a family of three is 1,050 litres, or 350 litres per person per day. The cistern, which contains limestone, gives the water a fresh taste and lowers acidity. It then contacts activated charcoal to absorb any inorganic compounds.