Features Non contact Copper Coating in Vaccum for clog free performance.Ultra Modern Azuretech support structure for easy fitment to varied roof types.HCFC free, Eco Friendly, High density PUF Insulation for High Heat retention.Glass enameled tank for Hard & High chloride water condition.Seven year of unparalleled warrantySS Electrical filament for backupCu-Ni-Al Selective coating for high Absorbtivity & low EmissivityMagnesium Anode for Galvanic protection.