... :Produce as customer's requirment Low pressurized solar water heaterSpecifications1.Solar Keymark,SGS,CE,CCC,ISO9001 2. ... OEMIt is one of the most common used solar water heating system for household, hotel, hospital, project ... water flow pressure, because the compact system is non-pressurized, water flow depending on gravity water head. This system matched with vacuum tube solar collector. Water flow ...