... high-efficiency 3,Modular design and auto-operation 4,Multifunction Solar water heater features:1.Modular design, arbitrary combination,harmonize with ... Multifunction: bathing, washing,domestic heating ect.4.Work longer hours,low cost and high-efficiency. Material of model:a, The ... glass 3.3e, Heat pipe: anti-freezing >-35°Cf, Water capacity:150L 200L 300L 500Lg, Heat preservation time:72Hr-80Hr ...