i know next to nothing about them, except that I bought a 110V for about
$1000, after returning a $300 identical unit, just to wash the car. Just
the extra oomph. Small bubble. 110V requirement. I have been told one is
designed for about 100 hrs of use, and the others I can only assume are,
commercial. Prob. about 3x price ave. between the 2 categories. Do a days
research on the internet, and you'll see the diff, then buy from a
industrial cleaning machinery supply co., if thats what you want.