... project capacity can be from 1000L-30000L Split Pressure Solar Water Heater:Vacuum tubes assimilate the advance 12 layers of ... of idle sunning, performing a strong heating ability, Certificate, CE, CCC, ISO 9001, Solar Keymark.Features:1) Highest efficiency2) Furnished ... can be applied to these systems6) Electrical heating element is optionalSpecifications1) Vacuum tube counts 15,16,18,20,22, 24, ...