Originally Posted by Comodave
Taping would be ok. I would double check and make absolutely sure that it isnít 220. I always like to step back and think about it when something is strange and then make sure I am going in the right direction.
Just double-checked as suggested. My first test was from red to ground bus bar. Next from black to ground bus bar. Red was live, black was not. Then, it occurred to me to test red to black to see if I had voltage. I did, 119V. That means my black wire is the ground in the circuit and I have, indeed, a 120V circuit. I will be purchasing a 120V water heater.