Water Heater Not Working on 120AC

[mikeandalicescott]

Hi,
I bought a used 2720SL from a friend and love it. Everything worked fine until last trip, when the water heater refused to work on 120AC. I turned on the three switches under the sink at the same time, and then filled the heater by opening the hot tap. Could this have burned out the heater element? Is the element replacable or do I have to replace the entire heater?
Mike S.