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