First, even if it is worth mentioning the many professional photo printers do not mean "professional" - you just need to find a printer that meets your needs.In addition, the labor market is held by two manufacturers, Epson and Canon. Yes, others are very good too, but it seems to have most of the market and minds of professionals.
Some printers include such popular and Epson R2880 Large Format Photo Printer, the Epson Stylus Pro 3800 Professional Edition C635011PRO inkjet printer and Canon imagePROGRAF iPF6000S.
Some of the issues professionals are concerned that less of a concern for most consumers.
1) professional photo printers can print on all important papers, at least 11 "by 17" and often much larger. For example, my printer photographer can handle 60 "wide sheets. Thumbs maximum widths are normally 24, 26, 32, 44 or 60, far more than the consumer price quality printers.
2) for the storage of quality - how long photos will last is another question. Professionals in print media to be published in magazines, newspapers, leaflets, etc. This is not a big deal. However, the fine art photography, this is a serious problem.
Although the technology is changing rapidly in this area, where storage is concerned about the exact quality specifications of the printer, including paper and ink. Archival quality may mean 300 years now, and even the consumer-end printers are stuck here!
3) The connectivity options. Professionals do not worry about direct printing from cameras or memory cards, if you're less likely that these functions are available. They are much more likely to print from a series of photo editing like Adobe Photo Shop.
Network connectivity options are more popular, however, is common to see a photo printer for professionals who share an apartment or other property.