... Water Heater, for school, hotel, swimming pool Vacuum Tube Solar Water HeaterSolar center heating project for school, hotel, ... large-scale projects, we use many-tubes-connected solar collecting system that is composed of solar collectors, storage tank, auxiliary heating ... 47x1500*50Pc180-2102.6016702020160512369170XSL50-58/1800Ø 58x1800*50Pc280-3003.912420202023551234096 Vacuum Tube Solar Water Heater