This product is the Non-Pressure Series Solar water heater.
The material of this solar water heater:

Inner tank: SUS304-2B stainless steel, the thickness is 0.4mm; the diameter is 360mm;

Outer tank: 0.4mm thickness color steel plate or aluminum-zinc alloy steel plate, the diameter is 470mm;

Thermal insulation level: 55mm thickness imported polyurethane overall foaming;

Bracket: stainless steel SUS430-1.55mm,applicable to flat floor and pitched roof;

Vacuum tube:  all glass vacuum tube, two Pipes inlet-outlet type; the absorbing coating is used of QB-AL-N/AL-47-1500/58-1800, there are two models: Ф58-1800mm / Ф47-1500mm.

Reserve the electrical heating gate and the gas vent,

There are other color for the bracket and ending cover: Derby red, dark green and saffron yellow.