... : 150L,200L,250L,300L,400L,500L,600L,700L,800L............solar water collector1) Reliable, efficient, twin-glass evacuated tubes2) Red copper ... us to be highly competitive.NOTE:1.above prices are based on FOB shanghai2.warranty:5 years for the whole system ... Insulating layer,compressed rock woolHeat Pipe pure red copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure 4MpaDust Ring ...