hot water heater Home › Forums › Public Forums › General Plumbing › hot water heater This topic has 4 replies, 4 voices, and was last updated 24 years, 5 months ago by Guest. Viewing 4 reply threads Author Posts 1 Apr 2000 at 4:26 am #272767 MasterPlumbersKeymaster The water from my hot water heater is getting hotter without any changes in the thermostat setting. Is this a sign that the thermostat is going or that the whole heater should be replaced? 1 Apr 2000 at 5:48 am #286261 jack spotzParticipant is it electric or gas? how old is it? (post serial#) how hard is your water? 1 Apr 2000 at 1:23 pm #286262 Scott BryanParticipant Glen, You have to replace the thermostats. I would replace both the upper and lower while you are at it. That should solve your problem. Good luck,Scott 2 Apr 2000 at 12:09 am #286263 GuestParticipant It’s a an A O Smith gas water heater . At least 24 years old – came with the house. Can’t see the serial number- under the insulation blanket. 2 Apr 2000 at 2:53 pm #286264 GuestParticipant If that boy is 24 yrs. old I would change it first chance I got before it goes all together and you have a mess on your hands Author Posts Viewing 4 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In