Pristine Vending Machine

The Pristine Vending Machine is a house improvement for the Megaton house or Tenpenny Tower suite.

Location
It can be acquired from Moira Brown for your Megaton house, or Lydia Montenegro or Michael Masters for the Tenpenny Tower suite. Its base value is 500 bottle caps, 462 caps at 50 barter, 450 caps at 100 barter, and 400 if you have the Master Trader perk.

Use
The vending machine allows you to turn Nuka-Cola into ice cold Nuka-Cola, which heals +20 HP instead of 10 (+24 instead of +12 with the food sanitizer). This won't make you any money, however, as ice cold Nuka-Cola sells for the same 20 caps as regular Nuka-Cola.

In addition to the machine, you also get eight complimentary ice cold Nuka-Colas, a Nuka-Cola bottle lamp, and a Nuka-Cola clock. It can also be used as an extra storage device, for those who like to keep their items separated. This is the only way to obtain extra storage space in your purchased home (without buying the Vault theme, which adds an extra locker at the Tenpenny Tower suite). Nuka-Cola can be put into the machine as if it were an ordinary container to avoid turning them ice cold.

Behind the scenes
Sierra Petrovita also has one in her home; however, you cannot pick the lock and the key doesn't exist. It can only be opened with the console command.