... /80mm/90mm, 2m*1m flat solar collector, the water can rise to 55°C in the Sun day 75-140kg/m2.3. Material of ... anti-corrosion. Operated automatically, stable performance, little maintenance, can stay for nearly 20 years8. Special preservation: Glass wool/ high dense polyurethane foam ... -square foot per gallon of one-day's hot water use. StructureThe flat panel are simple, efficient design, durable and ...