compact non pressure solar system 1.Certificates: CCC,ISO,CE,KEYMAEK 2.lifetime:15 years , ... , 2.5kw, 3kw), assistant tank( 5L, 8L, 12L, 15L), magnesium bar Feature1. Super anti-erode outer tank: Outer tank is made ... , and ensure the outlet water as stable temperature.3. Simple system, easy installation and low price. compact non pressure solar ...