SUNLIGHT SYSTEM ; This system has been designed for cold climate regions. This system is used vertical position working as a closed. 250 LT and 330 LT are produced. When heater liquid , which is inside the collector running as a closed circuit, is warmed by solar power, ıts intensity decreases and helps the water become hot by starting and moving inside the serpentine which is in the hot water tank. When the hot water start to be used , entering the cold water to lower tank from upper tank, so the- system ‘s sustainable provides.