... -freezing 4. ISO9001,CE,SRCC,SPF water storage tank solar water heater, high pressure water storage tank ,solar hot water tanksFeatures:1. It adopts ... lifespan is especially long. 2. For the all closed separated tank, the rated pressure is 0.6Mpa. 3. It adopts the ... pressure and overflow automatically, so that the dirt in the tank can be drained easily. 5. Temperature pressure relief valve can ...