heaters failing, mot one, not 2 but 3

[Myka]

Originally Posted by mike31154

I always [...] keep the control knob & cord above the water line.

Good point, my heaters are all at an angle too with the tops out of the water. Only the bottom half or so of the heater gets hot, and the thermostat is just above the heat coil. As long as the thermostat is under water that's enough.