Unpressurized stainless steel vacuum tubes solar water heater

1) Adopting the best conduction performance metal-copper TU1(heat pipe).
2) Superior heat preservation ensured by 55mm polyurethane foam insulation layer
3) Antifreezing, all-year-round service even in extemely cold area, Able to be used in all climates,
4) Designing the immersion heater hole in advance for the cloudy, snowy, and rainy days
5) Humanized design,no water directly flowing in the tubes,enabling the system still workable in case of occasional tube breakage.
6) Automatic water supply, could supply water self-acting without any other installation and could able to be pressured.