Detailed Product Description*Latest style & Hot sale style*material of inner & outer tank: stainless steel SUS-2B 304*automatically water supply*Non-pressurized Solar Energy Water Heater(It is specially designed for the acid rain area, since it is stainless steel outer tank material .*SUS304-2B stainless steel inner tank material(310mm/360mm diameter, thickness:0.4mm )*SUS304-2B stainless steel outer tank matetial(420mm/460mm diameter thickness:0.4mm)*50mm/55mm thickness insulation with polyuthane foaming*Capacity: 100Lÿ 150L 200L 300L etc*assistant tank:5L*SUS304-2B stainless support stand*support angle: 27 / 45/ etcÿ*Vacuum tube style:ÿThree-target & sealedÿÿglass styleÿÿÿÿÿÿÿ*Vacuum tube size: 47*1500mm, 58*1800mm*specific absorption: as=090-0.94*average heat loss coefficient : Ult 0.6W*Resistence to rain hail & acid rail*easy installation*lifespan:ÿÿ 15 years*10 years warranty