... capacity: 150L,200L,250L,300L,400L,500L,600L,700L,800L............solar water collector1) Reliable, efficient, twin-glass evacuated tubes2) Red ... and reducing your fuel cost13) Domestic and commercial use, solar collector is ideal for both domestic and commercial use, and ... freeze:using the anti-freezing liquid as the medium and the controller has anti-freezing function Solar collector(Heat pipe series) ...