compact heigh efficency solar water heater 1,high heating efficiency 2,easyly installation, energy-saves 3,competitive price compact high efficency solar water heaterNon-pressure Solar water heater (all stainless steel)One pipe inlet-outlet(LS01-B)Details of non-pressure solar water heater: 1. Inner tank: Stainless steel SUS 304-0.41mm2. Vacuum tube: QB-AL-N/AL-47-1500/58-18003. Outer tank: Color ...