Earthships catch water from the sky (rain & snow melt) and use it four times. Water is heated from the sun, biodiesel and/or natural gas. Earthships can have city water as backup. Earthships do not pollute underground water aquifers. Water is caught from a roof with a potable surface. From the roof, the water is channeled through silt catches into cisterns. Cisterns are sized to the local climate and are best buried and completely protected from the sun. The water from the cistern is gravity-fed into a Water Organizing Module with a pump and filter. The pump pushes the water into a pressure tank to supply code required water pressure. The filters clean the water for consumption and cleaning.

In an Earthship, water is heated by the sun and natural gas. The sun heats the water, and the natural gas water-heater only turns on if the water is not hot enough. This is called “gas-on-demand” water heating.

Water Organizing Module (WOM)

Water from the city, cistern, your well, etc. can all be hooked up to the WOM. Automated systems can manage your water levels. So that the rest of the house has regular plumbing, the WOM, filters clean the water for human consumption and use.

The WOM is part of our retrofit package for your existing home, they are not only fit for Earthship use. If you are interested in finding out more, please contact us at

Hot Water Recirculation Panel

The hot water recirculation system is a water saving set-up designed so when you turn a timer switch at a fixture the water that has cooled in the hot water lines is returned to the cisterns while replacing it with hot water.

In order for the hot water system to work, the plumbing for it must be done during the rough-in as well as the electrical. This is shown on the construction drawings available from Earthship Biotecture. The kit includes the hot water recirculation panel and required number of timer switches for your home.

For more information on the hot water recirculation panel, please contact us at