The Dell S300W comes with a pretty standard parts and labor warranty of 2 years. It also comes with a 2-Year Advanced Exchange Warranty. The exact details of this warranty were not on the Dell web site at the time of this review.
We consider an exchange warranty to be of great extra benefit, especially for those using portable projectors. If your school, however, tracks assets you may favor a loaner program, which some others offer. Most manufacturers, however do not offer loaner or replacement programs.