I seem to be asking you all sorts of questions! My water heater is old (of course) and has suddenly started over-heating the water? The water comes out extremely hot at first and then about 10 minutes into a shower, or dishes, the hot water runs out. This is unusual, it usually lasted about 30-45 minutes before running out. I'm assuming it's probably something with the thermostat, but thought I'd ask the expert! (Yes I know it's dusty).
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It could be hard water as well. We have a well and no water softener! Thank you, I will check this first.
Another problem may be the bottom thermostat malfunctioning. This means only the top element is getting power. A multimeter will tell you if either element or thermostat is at fault if you know someone who can read one for you.
Awesome, thank you!! I think you might be right about bottom thermostat, and actually that was my gut instinct as well.