Water Temperature Too Hot? Home › Forums › Public Forums › General Plumbing › Water Temperature Too Hot? This topic has 1 reply, 2 voices, and was last updated 24 years, 8 months ago by Scott Bryan. Viewing 1 reply thread Author Posts 21 Mar 2000 at 7:34 am #272690 MasterPlumbersKeymaster What is wrong when the water temperture gets to high on an eletric water heater. It is set a 120 and thewater temp has gone to 170. 21 Mar 2000 at 2:21 pm #286136 Scott BryanParticipant You need to replace the thermostats. When the water temp exceeds the set temp the thermostat it not shutting off . Try replaceing the upper one first. Scott 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