tankless toilets
 

how well do the work & flush? Best place to buy?

Go a picture or at least a web site.
Sure your not talking about a one piece toilet and tank, not a tankless one.

:huh::eek::huh::eek::huh: help me understand

are you are talking about the toilets you see in restaurants and such with a flush valve or are you talking about the ones with a pressure tank inside the back?? for the flush valves you need a 1" line to feed those for them to work properly.