We have an electric water heat that recently started heating the water to about boiling. We heard a loud pop one night, not sure if that has anything to do with it.
So far we just replaced the heater's thermostats thinking that was it, but after turning it back on the water was super hot again within 20 minutes.
Could it be the elements? This is in my mother's house. She is leaving soon so would rather not spend 300 on a new one since we can take back the thermostats and get elements for 100.