... any other solar water heater:Product ModelXK-SPVacuum tube58-1800mm co-axial structure high borosilicate 3.3 three-target glass vacuum tube with anti ... low temperature ≥-35Frame optional angle0°,25°,38°,45°Capacity of water tank80L,100L,150K,200L,250L,300L,400L,500L. 40L/person ... for product cost and sea freightGuarantyWater tank for 3 years, tube and frame for 5 yearsMOQ1 set solar water heater