1) Model no.: GTC-58-alu
2) Adopts U pipe technology
3) No of tubes: 18, 20, 24, 30
4) Disassemble: no
5) Total length (m): 1.65/1.90/2.00/2.45
6) Total width (m): 1.9
7) Gross absorb area (m²): 3.14/3.50/3.80/4.66
8) Aperture area (m²): 2.52/2.96/3.36/4.20
9) Surface absorber (m²): 2.18/2.30/2.42/3.03
10) Reflector: non
11) Operation pressure (Bar): 8
12) Entry connector size: ½" male/copper tube
13) Material of manifold: anodized aluminum, 2mm
14) Material of U pipe and manifold head: TU1 copper
15) Insulation of manifold: polyurethane
16) Slot of thermic sensor: yes
17) Cold resistance: -30
18) Liquid capacity: 2.8/3.2/3.80/4.70
19) Total weight (kg): 39/42/47/65
20) Min. flow (L/m): 120
21) Typical flow (L/m): 150
22) Max. flow (L/m): 600
23) Stagnation temperature (°C): 300
24) EN 12975 (solar keymark) in course
25) Date: October 15
26) Efficiency (n0 in %, k1 in W/m²K, k2in W/m²/K²); n0=0.77, k1=1.47, k2= 0.0051

Tubes:
1) Hail resistance: ≤25
2) Diameter of tube (mm): 58
3) Glass quality: borosilicate, 3.3 (T=0.91)
4) Thickness (mm): 1.7
5) Vacuum degree (Pa): 3 x 10-3
6) Absorb rate: ≥0.94
7) Reflecting emission: <0.06
8) Material of coating: SS-C/CU