The water needs are taken care of with a 31 gal (140 l) clean water tank installed under the floor, and a clever greywater filtration system. This comes in the form of a green roof, which apart from offering insulation also contains marsh plants that can filter greywater run-off from the sink and shower in a natural way. The way this works is that there is a pump system, which transports the greywater to the roof. It then takes about 24 hours for the water to be purified by the plants and fed back into the tank. A wood-burning stove and solar power are used to heat the water and take care of the hot water needs. There is also a bio-toilet, which separates liquid and solid waste and turns both into fertilizer.
Wohnwagon trailer prices range from $45,000 to $110,000, depending on the specific customizations the buyer wants.