It's one of the most common used solar water heating systems for household, hotel,hospital, project application etc.It has simple structure and working priciple but is the most economical.

It's easy to be installed on the roof to get enough water flow pressure, because the compact system is non-pressurized, water flow depending on gravity water head.

This system matched with vacuum tube solar collector. Water flow inside and complete a circulation on it own without given pressure, which is how the name comes from.

Material:

1. Inner tank: Stainless steel SUS304-2B, 0.31mm

2. Outer tank: Galvanized steel

3. Vacuum tube: Single -target

4. Bracket: Galvanized steel

5. Insulation: Polyurethane

6. Optional apare parts: electric heater, magnesium rod, assistant  tank,  reflector

7. Packing: Export carton with full foams