EnerWorks solar water heating appliances are the first to qualify for the Department of Energy’s new ENERGY STAR residential water heater program. EnerWorks two, three, and four collector High Performance appliances, as well as all SpaceSaver single tank solar + electric appliances, bear the ENERGY STAR registered trademark. The ENERGY STAR program for residential water heaters went into effect on January 1st, 2009. Qualifying products are posted on the Energy STAR website. For more information, please visit http://www.energystar.gov/waterheaters.