Just curious of how many years of use some of you guys are getting on your circulating pumps. I am asking because I have two circulators running a: "be nice to me", off peak ELECTRIC, boiler in floor heat system, for my wifes boarding kennel. I have two Taco 007's, that have been in use for about five years now. The pumps dont run continusely, only when the boiler is running. I dont have a replacement on hand, but I think its time to get one, just in case.