... solar water heater 1. Solar Keymark,SGS,CE,CCC,ISO9001 2. high quality&competitive price 3. OEM&ODM Solar Water HeaterIt ... the compact system is non-pressurized, water flow depending on gravity water head. This system matched with vacuum ... 4) Outer tank: Steel (spray-paint and looks like China paint) 5) Capacity: 150L 6) Insulating layer thickness: ... : 72hrs 11) Hail resistance: 25mm solar water heater