... whole system and 15 years for vacuum tube.Non-pressurized solar energy1.solar water heater with CE,3C,ISO9001,CNAL certificate;2.special good ... coating, 47*1500/58*1800mmAccessories: MG rod, electrical heating, assistant tankLogo: OEM, co lour printing /stickerFeature: 1.Solar water heater with CE,CCC,ISO ... -AL4.68m²300L7-11 2012 best selling non-pressurized rooftop solar water heater