It was a 7.5g pot, so size is minimum, but okay.
I use an aluminum pot and the myth of off-taste is just that, to treat it, you just need to build an oxide layer, which is done by filling with water and bringing to a boil. I just put a gallon or so of water in mine, put lid on, and let the steam do that.
Its actually a really cool idea, but I'm thinking its 120 volts since it does not mention any special power requirements, so it will take a Loooooonnnnggg time to come to a boil. I'd buy a 220v 15 gal version of this if it exists!