central vacuums without pipes
Yes, I use all of my central vacuum units without pipes. A couple of them have a utility valve on the unit but most don't, they just have the intake for the pipe. For those units, attach a utility valve directly to the intake and plug in your hose. The power is awesome, it's the most powerful canister configuration available, and since you're not going through pipes, you get all of the power the unit has to offer. Connecting a hose directly to a dual motor 240 volt unit is an experience like no other. I have four of those and I call them the beasts. Even using a single motor 120 volt unit this way is more powerful than any portable vacuum, and it's really the best of both worlds. You get the power that central vacuums offer without the need to install piping in the walls. I have central vacuum units all around my apartment, there is at least one in every room, and some rooms have several.
Mike