The Double ZeroHouse 3.0 debuted last fall at KB Home's Fiora at Blackstone community near Sacramento, Calif.
The open kitchen features a touchless faucet and KitchenAid water-recycling dishwasher that saves the water from the last rinse cycle to pre-rinse the next cycle.
University of Texas at Austin, partnering with Germany’s Technische Universitat Munchen will construct a net-zero home called NexusHaus.
Engineered for arid climates, water-conservation is a central design tenet of the Vali Homes prototype home in Phoenix.
The PureBlue Home in Bristow, Va., is designed to be ultra energy- and water-efficient.