I work at a plumbing supply house. We are pretty small, only 10 employees but we have started a program in which we track the warranties of the items we sell to the properties. We can, at any time, print off a list of those units and the time left on the warranty and send it to the property. This doesn't track what unit it is in, however, if the property sent us that information we could input that too. We usually handle all our warranties in house (no dealing with a huge manufacturer!) so this information is helpful for us too.