non-pressurized compact solar water heater 1,high heating efficiency 2,easyly installation, energy-saves 3,competitive price non-pressurized compact solar water heaterNon-pressure Solar water heater (all stainless steel ... resistant stainless steel6) Type: 12, 15, 18, 20, 24, 30, 36tubes 7) Capacity: 100-350 litersSolar water heater Remark: 1. Solar heat storage tank ...