Sorry Tom, I think you're a little off on this one..
What I think he's referring to is a front-loading, all-in-one washer/dryer combo unit...
I have one made by LG, and it's pretty fantastic, at least for my house's washing patterns. Here are some salient points:
1) 120V only, standard circuit (mine is on a 20a circuit, but I believe the are fine on 15a)
2) Rather low water requirements, like most high-efficiency front-loaders
3) Very high spin rpm, helps with the drying a lot
4) No dryer vent! The drying cycle works by condensation... a little bit of heat (not much) in the drum, and a refrigerated coil to condense the water. It's essentially a big dehumidifier, or a heat pump inside the machine.. heating the clothes and cooling the air (and getting condensate out) When it's on a dry cycle, the clothes tumble slowly and every minute or so the pump kicks on and ejects a couple of cups of water
5) Washing clothes is a one-step process... put them in dirty, and the come out clean AND dry. This also means that you can't forget to put the towels in the dryer and end up with mildew towels (guilty as charged... )
We've had ours for more than a year now, and there ARE some significant downsides, though overall we're very happy.
1) Takes a looong time to do the laundry, about 3 hours or so. Has a countdown timer.
2) Puts a pretty large amount of moisture into the air, at least as much as a shower.
3) The steamy inside air condenses on the cabinet, resulting in a sweating washer and a little water on the floor. Fits inside a standard square washer pan though, and it's very little water.
4) We had one lint-jam early on, fixed under warranty (and now I know how to do it myself)
5) It's really pretty quiet, but if you don't level it properly it will vibrate like the bejeezuz because of the high-speed spin.
So.. to answer the OP questions...
They are not very portable at all and have rubber feet rather than wheels. The output hose is smaller than a usual washer hose (because it uses less water, I imagine) and it comes with a plastic clip to hold it bent for use in a laundry sink. I don't think this would work with your kitchen sink; you'd have to rig something else up, probably involving nylon wire-ties. That would almost certainly not be to code.
The washer also requires the usual cold/hot water hookups.
I suggest that you simply install a washer-box, which you can get at Home Depot or Lowe's. This is a plastic box that you install into the wall which has hot/cold and a drain standpipe. Adding a drain standpipe to your sink should be a snap if the existing plumbing is PVC.
ANYHOW... here's the model we have here, and overall I'd rate it as a 9/10:
Buy.com - LG Electronics 3.8 cu.ft. Front Load All-In-One Washer and Dryer Combo - WM3677HW
Yeah, I know it's expensive... but not a lot more than the high-efficiency washer PLUS dryer, and it takes up half the space and uses half the energy.
~aaron
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