... ISO9001:2000 certification 4.Best price with high quality Pressurized Solar Water Heater.1,vacuum tube length:47/1500mm,58/18002,vacuum ... T relief valve ,electrical heater element with terminator5,Heat exchanger:20m long,12mm diameter,1mm thickness coppper pipe.Feature:1,Pipeline is ... made of all red cooper and conducted by heat transfer medium liquid.2,Water doesn ...