... , high heat effect, high hot water produced, anti-insolate, water heater in the copper pipe, reliable quality, free maintenance, can stay ... collector, the water can rise to 55°C in the Sun day 75-140kg/m2.3. Material of core: Copper and ... outlook and more high anti-corrosion. Operated automatically, stable performance, little maintenance, can stay for nearly 20 years8. Special preservation: Glass ...