Rheem Furnace life expectancy Home › Forums › Public Forums › Gas & Gasfitting › Rheem Furnace life expectancy This topic has 1 reply, 2 voices, and was last updated 24 years, 2 months ago by Art_xyz. Viewing 1 reply thread Author Posts 15 Sep 2000 at 5:05 am #278079 MasterPlumbersKeymaster Wondering what the average life expectancy is? I realise some could fail soon, and some could last a very long time, but am looking for an average. Ours is 25 years old and working fine, just trying to do some budget planning for the future. Its an updraft, no AC, Model 3204-100JD if that helps. Thanks in advanceBob. 15 Sep 2000 at 11:46 pm #297656 Art_xyzParticipant You’ve already gotten your money’s worth. Better start saving up. Normal life expectancy 15 to 20 years on a hot air furnace. Normal life expectancy on a cast iron boiler- as long as you live at least. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In