I have a 14 year old electric water heater (40 gal, 2 4500w elements). The water temp begins to cool down significantly in the middle of a second shower. There are only 2 people in the house.
Thermostats work - both come on and off normally depending on how I set them and they properly apply voltage to the heating elements. Both heating elements show 15 ohms and draw 17+ amps.
Anybody got an idea what the problem could be?
TIA
Chuck