This one (see attached photo) worked with no problem until I took it out of service about 20 years ago and replaced it with a conventional heater. It has a huge copper coil inside. It's been sitting in my basement every since. The label on the front says this: http://oldapplianceads.com/wp-content/uploads/2014/06/pittsburgh-automatic.j... Take a look at similar heaters on the web: http://www.ebay.com/bhp/antique-water-heater Mine is probably over 100 years old. Best offer. -dk