I think what Maiden is trying to say is something like this (correct me if I am wrong). If you take the cover off of your breaker box you will see two large cables coming in at the top. Each one of these is a 110V supply line. Now if you look down a line of breakers vertically, you will see that each one going down, connects to one of these lines in an alternating fashion. Thus creating a 110v circuit for each single breaker space.
To get a 220V circuit you need a 220v breaker. A 220v breaker fills 2 spaces vertically and spans the contacts for both lines of 110, giving you 220V.
Erik, for the rig you are looking at to work, the outlets you plug it into each need to ultimately attach to a different 110V supply line back at you breaker box. Otherwise all you have is 110V.
Did that make sense? I hope so.