The roof of the Earthship collects water as it rains and it drains into a cistern located either inside the Building or externally near the home. It is stored there until needed. This water can then be pumped anywhere in the house by use of conventional plumbing. Fixtures and piping are located in the greenhouse hallway to allow ease of installation and efficient design. A water control module is located near the cistern which provides pumps, filters, gauges, and a pressure tank.
Solar electricity is used to power the water pumps.
Hot water can be acquired by the use of Batch heating systems and gas hot water demand heaters. Batch heaters use the sun to heat a batch of water for use during the day. In sunny areas these are very effective. In cloudier areas a hot water on demand heater may supplement them to take up the slack. These systems are very effective and cost efficient.