I think my 40 gal. Rheem has a glass tank(?), the builder's specs are hard to read. Is that right? If so, why don't the web sites indicate what type of tanks they have? I finally found an A.O. Smith site, which mentions a glass *coating* on one of their lines, is that what I am looking for, if I have been happy with the water heater I have had for 18+ yrs.? Is it not usually listed, because all, or most of them ARE glass coated?
It also mentions the different types of venting, which is something else, I don't know about. My water heater is down stairs, next to my heater, in a big open unfinished storage room. [It's a split level house. One occupant.] Is there anything special I should know about that, so I won't be sold something I don't need. TIA, for anyone who will reduce my ignorance about *today's* water heaters, and what I should be looking for or buying. :)