The SunCache integral-collector-storage (ICS) solar water heater uses a roof-mounted, water-filled, unpressurized, polyethylene panel and copper heat exchanger to pre-heat water for domestic use. Developed through research supported by the U.S. Department of Energy, the relatively inexpensive SunCache captures heat in 50 gallons of non-circulating water stored in a rooftop panel. When a hot-water tap is turned on, cold water from the supply line flows through the copper heat exchanger embedded in the panel, extracting heat from the stored water. The pre-heated water then flows, via cross-linked polyethylene (PEX) tubing, to conventional storage or a tankless water heater. No pumps are used. The acrylic glazing minimizes convective heat loss, but nighttime losses from the collector will still be significant. People using hot water in the afternoon or early evening will see the greatest energy savings. SunCache is affordable and easy to install, making it appropriate for both professional and do-it-yourself installations. The water heater is designed for warm climates, including the Sun Belt, and is not intended for use in cold climates.
Harpiris Energy, 25205 Baronet Rd., Corral de Tierra, CA 93908, Phone: 530-220-7000, Fax: 831-373-2344, www.harpiris.com