SunEarth's SunSaver system is Pacific Solar & Photovoltaics' only OG-300 certified system that is specifically designed for climates that never experience freeze conditions. Potable water under city pressure efficiently circulates directly through the solar collectors and into the solar tank. Because the system does not utilize heat exchangers, drainback tanks, or other components required in cold climates, the SunSaver is an extremely efficient solar water heating system.