... Split Pressure Solar Water Heater, project capacity can be from 1000L-30000L Split Pressure Solar Water Heater:Vacuum tubes ... assimilate the advance 12 layers of spattering deposit of rivalent element technology, high borosilicate glass, gradual change of SS- ... Automatic controllers can be applied to these systems6) Electrical heating element is optionalSpecifications1) Vacuum tube counts 15,16,18,20, ...