Solar Water heater Himin "3-Hi Solar Core" vacuum tube (Æ58, 1800mm); Inner tank: 0.5-0.6mm thick SUS304; Outer tank: Color galvanized steel plate; Material of frame: Color galvanized steel plate; Insulation: PU and the density is 40kg/m3; Capacity: 130,140,150,160,165,180,185,200,215,260,290,300,310 etc. Controller: automatic and convienience.