Submit a question to our community and get an answer from real people.
Submit

My water suddenly got much hotter. Does that indicate a hot water heater thermostat issue?

Report as

Check if thermostat is set correctly.
Overheating usually means thermostat problem on gas water heater.
Replace gas control valve. Use identification information located on side of gas valve to order exact same gas control valve.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
Overheating on electric water heater can be caused by defective upper or lower thermostat, or a cracked element shorted to ground through metal tank.
Test elements and then replace bad element, or if elements are good, then replace both thermostats.
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Helpful Fun Thanks for voting Comments (0)
Report as
Add a comment...

It is common for mineral deposits to form on the thermostat inside the tank. Use a meat thermometer or digital thermometer to verify that it is too high before replacing the thermostat. Generally 120 F is a good setting. If it reads higher than it is set for, replace it.
Step by step directions for replacing a thermostat are on my blog: realgreenplumbing.com. I've done oodles of them in my career.
Good Luck!

Helpful Fun Thanks for voting Comments (1)
Report as
Thanks!
Report as
Add a comment...

Maybe the thermostat on your hot water heater got turned up accidentally. Was anybody by your hot water heater lately that could have done it. You can turn it down yourself. It's usually a red button on the side of the hot water heater.

Helpful Fun Thanks for voting Comments (1)
Report as
Thank you.
Report as
Add a comment...
Do you have an answer?
Answer this question...
Did you mean?
Login or Join the Community to answer