• KB Homes says its ZeroHouse 2.0 in Maryland can save owners almost 50,000 gallons of water a year and cut close to $6,000 from annual energy bills.
• The model opens Saturday in KB's Middletown Woods community in Waldorf.
• KB did not say what its asking price is for this kind of house, which uses "an efficient building envelope, energy-conserving lighting, appliances and fixtures with a renewable energy source in the form of solar power system," but Middletown Woods floor plans are listed from $304,999 to $359,999.

From the article: Imagine a home that can save nearly 50,000 gallons of water a year, has an electric bill that could be next to nothing and can be monitored and controlled from your iPhone.