... years warrany Sunrise compact pressurized vacuum tube solar collector Features:1. This system consists of solar vacuum tube, heat pipe, water tank, ... complete system doesn't need any power, green and economic.6. Easy install, easy operation, fashionable.7. Well wind, snow ... degree, 25 degree, 30 degree, 38 degree, 45 degree.P.S. 1. Controller can display the temperature, water level, automatically ...