1. Inner water tank---is made of imported paintless steel plates with the thickness of 0.5mm, applies automatic computer cryogenic welding technology, and the thickness of the oxide layer is below 2u.

2. Heater preserved layer---the thickness is between 50mm to 60mm, is made of imported polyurethane, and only falls 3 centigrade degree or 5 centigrade degree a night.

3. Support---utilize superior powders made by Akzo. Nbel and Tiger company, and six-layer treated.

4. Vacuum tube---58mm*18mm.

5. Capacity--- with 30 tubes is 250L; With 24 tubes is 200L; With 20 tubes is 170L; With 18 tubes is 150L; With 16 tubes is 135L with 14 tubes is 120L.

Primary technical parameter:
Model Capacity
(L) Solar gathering area (m*m) Output of water in summer(42centigrade) Output of water in winter(42centigrade) Waterproof tank
S46A-5818-30 250 4.00 410 330 IP*4
S46A-5818-24 200 3.18 330 260 IP*4
S46A-5818-20 170 2.65 280 220 IP*4
S46A-5818-18 150 2.37 250 200 IP*4
S46A-5818-16 135 2.10 220 180 IP*4
S46A-5818-14 120 1.84 200 160 IP*4