Sunte - Pre-heated Evacuated Solar Water Heater

The water in water tank is for heat preservation and circulation. The vacuum tube collector absorbs sunshine to heat the water in the water tank. When using the hot water, the cold water flows through the inlet, the copper coil absorbs heat then transfer to the cold water, so that temperature rise up ceaselessly, due to the original feature of the copper coil. The water temperature of the outlet is closed to the water in inner tank (difference within 3 degree centigrade). Therefore, cold water flow via copper coil and absorbs much heats, when water flow past outlet, the temperature is usually hot enough to use.