500 LTR SOLAR WATER HEATER OF ETC BASED SYSTEM WITH STAINLESS STEEL 304 GRADE INNER TANK THICKNESS OF MINIMUM 1.6 MM , MINIMUM 50 MM THICK WITH CFC FREE PUF HAVING DENSITY OF 28-32 KG PER CU. MTR THERMAL INSULATION,OUTER CLADDING GI SHEET WITH ANTI -CORROSIVE POWDER COATING MINIMUM AND FRAMES ARE 0.4 MM THICKNESSS. HOT WATER PIPE LINE-CPVC PIPE OF SDR 11 GRADE 10.00 KGF /SQ CM WORKING PRESSURE20MM/25MM AND COLD WATER PIPE LINE -PVC PIPES 10.00 KGF/SQ CM WORKING PRESSURE 25 MM INSTALLATION WITH SERVICE