This kind of solar water heater absorbs the sunlight by vacuum tubes, then heats the water in the tubes and the water in the tanks. But we don't use the water in the tank. So the hot water can be stored in the tank, the temperature can reach more than 90℃. We use the copper coil as the heat exchanger.

When we use this type solar water heater, we can take advantage of the tap water's pressure. More pressure, more comfortable.

Because the water in the tank always keep hot, so the tank and the vacuum tubes can not be freezed.