Circulation pipeline: Household solar water heaters usually work in a natural circulation mode without external power. Vacuum tube solar water heaters are plug-in structures, and hot water is powered by gravity. Flat plate solar water heaters are powered by tap water pressure (called top water). Solar centralized heating systems all use pump circulation. Since the solar water heater has a small collection area and takes into account heat energy loss, pipeline circulation is generally not used.
Usage process: Flat plate solar water heaters work in top water mode, vacuum tube solar water heaters can also work in top water mode, and jackets or coils can be used in the water tank. The advantage of top water operation is that the water supply pressure is the tap water pressure, which is greater than the natural gravity pressure, especially when the installation height is not high. Its characteristic is that the water temperature is high first and then low during use, which is easy to master and easy for users to adapt to, but it requires tap water to maintain water supply capacity.
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