Low pressure solar water heaters are widely used in the middle east, this is the cheapest kind of solar water heater.

The biggest advantage is the low cost.

The disadvantage is this non pressure series is that they can not combine perfectly with the buildings.Features:
1) The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation
2) Parabolic surface internal bladder: higher pressure-supportive capability
3) The best angle: a reasonable bracket angle basing on different latitude in order
to gain more heat
4) Convenient installment: available on both horizontal and slanting house roofs
5) Super and strong heat preservation: using the world's advanced hydraulic pressure
technology to make it with higher heat preservation
6) The diffuse flat plate reflector: to increase heat-getting efficiency
7) Meeting the demand of all kinds of families
8) Economical goods with high quality