UV Sterilizer

No, it’s not a need. There’s the good ol’ boiling in hot water method or steam steriliser as well. All 3 methods can sterilise effectively. Their prices are v different though. Added benefit of UV steriliser is heat drying, which is very convenient, as well as the ability to sterilise other things like toys, etc. What you can’t use the UV steriliser for is latex/rubber, so you need compatible bottle teats.