SunWater PV Water Heater is the highest rated in its class offering 2x the efficiency of comparable products. View our SRCC solar rating for our SunWater PV Water Heater. With over 40 years of solar energy experience, in an everchanging landscape, we recognized the need for a dual electric source, solar water heater. A simple, clean, easy-to-use solution delivering high-performance for low and variable occupancy applications. An intelligent Water Heater configured and specifically designed to match your lifestyle! Featuring Safe, PROVEN THERMAL BATTERY TECHNOLOGY, Increased financial security, with NO PV INTERCONNECTION RESTRICTIONS.