What is the working principle of solar water heater? And what is different from gas heater and electric heater ?

The working principle is that vacuum tube absorb sunlight then heat the cold water, and then hot water up to tank and cold water that is inside the tank flows down to vacuum tube, based on such circulation until the tank is full of hot water. Compared with gas heater or electric heater, the source it relies on  sun, more economical and environmental compared with the other heaters.

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Keywords: Solar Energy , Non-pressure solar water heater, Pressurized solar water heater.