I bought this for a few jobs around the house and it works great. If you are looking for the serial number put the washer on a workbench and get a magnify glass.
I was rather skeptical regarding small residential electric power washers - this one surprised me. Once assembled it worked great. I purchased it primarily to clean a large cement deck, which (with the additional surface cleaner attachment) turned out beautifully and in less time than I initially anticipated. The unit is on wheels and lightweight, pressure hose and electrical cord are long - the water pressure was just what I was looking for. This washer will work for my walkway, driveway, house and garden shed. Additional attachments are available. It is well worth the price I paid.
Performs as anticipated. Easy enough setup. So far so good. I trust the Westinghouse name more than I would any of the many Asian brands available and hopefully my trust will be warranted.