... 4.5 years qurlity assurance Split Pressurized Solar Water Heater Contain main parts: Solar Collector, Pump Station and Water Tank. 1. Working principle ... 5.Heatpipe: Ati-freeze:-35C6.Capacity:100L,150L,200L,250L,300L,400L,500L MODELWater Tank Vacuum tubePackage Qty.(Sets) ... Anti-freezing>-35 degress centigrade 9) Water capacity: 150L 200L, 250L, 300L, 400L, 500L 10) Pressure: 6Bars 11) Daily efficiency ...