Non pressure solar water heater（No small tank）
Advantage:
1.Adopt glass vacuum tube absorption, direct thermosyphon circulation, realize high efficiency working.
2.The electric heater is placed in the middle of the tank, when the water temperature reach 80 degree, the electric element stop working and start again when temperature drop to 50 degree.
3.Open tank design, long lifetime.
4.Outer tank color optional
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