SPECIFICATION Tank capacity: 100 ~ 1000 Liter Vacuum tube size: F58*1800MM Solar collector tubes: 10; 12; 15; 18; 20; 24; 30 Pcs Vacuum tube: Three-target coating Cu/SS-ALN(H)/SS-ALN(L)/ALN Heat pipe tube: High-quality TU1 copper 14MM or 24MM condenser Manifold: Copper pipe header, rock wool & PU insulation, aluminum casing Inner tank material: Food-grade stainless steel SUS304-2B or SUS316L Tank insulation: High-density PU foam with 80 hour heat preservation Outer tank material: High-quality color steel or stainless steel SUS304 Bracket material: Shaped strong aluminum alloy or stainless steel Accessories: Solar pump station; electric heater; magnesium anode Solar collector angle: 25°; 38°; 45° Hail Resistance: 25MM Anti-freezing: -40°C Working pressure: 6.0 bar