i would have no fear in buying a used unit giving that it looks like its in decent shape. maybe bring hardware to plug all pipe holes and pressure test unit if its not up and running. all of these boilers are built extremely well. if did it over again i dont think i would buy new, theres a considerable amount of savings on a used unit. there are a couple boilers in the classifieds right now for about half of what they cost new. i would get in touch with member glenn harris, he is always posting used efms, and keystokers. im sure he can find you the right sized unit at a great price. good luck!