... solar water heater CCC,CE,Soalr Keymark,ISO9001,SGS high quality, competitive price OEM service solar water heaterhigh quality, competitive priceOEM serviceCCC,CE,SGS,ISO9001,Solar ... compact system is non-pressurized, water flow depending on gravity water head.This system matched with vacuum tube solar collector. Water flow inside and ... which is how the name comes from. color steel solar water heater