... ,green,good quality & price 3.non-pressurized solar water heater,OEM Split pressurized solar water heater non-pressurized solar water heater,solar hot water heater,OEM solar water heater *Materials: A) Inner tank: SUS304-2B ... : 0.4mmC) Bracket: 1.6mm* Heat collector: heat pipe vacuum tube A) Highly absorptive vacuum tubes with aluminum nitride coating B ...