Solar Water Heater Capacity of water tank:80L-500L Copper coil length:20m(bottom),15m(up);or any other solar water heater:Product ModelXK-SPVacuum tube58-1800mm co-axial ... low temperature ≥-35Frame optional angle0°,25°,38°,45°Capacity of water tank80L,100L,150K,200L,250L,300L,400L,500L. 40L/person ... for 3 years, tube and frame for 5 yearsMOQ1 set solar water heater