1/ Corrugated Stainless Steel Pipe & Brass Fitting, 2/ Insulation Pipe, 3/ Flat Plate Solar Collectors, 4/ Flat Plate Solar Water Heater, 5/ Heat Pipe Solar Water Heater, 6/ Solar Collectors, 7/ Finned Absorber of Solar Collector, 8/ Heat Pipe, 9/ Float Switch, Water Heaters ...