... tube: AL/N coating, 47*1500/58*1800mmAccessories: MG rod, electrical heating, assistant tankLogo: OEM, co lour printing ... . The cold water in water tank flows into the tube and become hot, because of different density between cold and hot water, ... hot water for about 2 days without any sunshine, consumer can enjoy comfortable bathe anytime. profession manufactory and supplier of solar hot water heater ...